From 4f95fba70b0d21972c2c167dd2d52f4d7724fb69 Mon Sep 17 00:00:00 2001
From: Glen Cheney <cheney.glen@gmail.com>
Date: Wed, 10 May 2017 11:03:14 -0700
Subject: [PATCH] Update filterMode option. Add tests for filterMode.

---
 _includes/changelog.html |  2 +-
 _includes/options.html   |  1 +
 dist/shuffle.js          | 35 +++++++++++++++++------------------
 dist/shuffle.js.map      |  2 +-
 dist/shuffle.min.js      |  2 +-
 dist/shuffle.min.js.map  |  2 +-
 src/shuffle.js           | 30 ++++++++++++++++--------------
 test/test.js             | 11 +++++++++++
 8 files changed, 49 insertions(+), 36 deletions(-)

diff --git a/_includes/changelog.html b/_includes/changelog.html
index 0ffc50e..315adc1 100644
--- a/_includes/changelog.html
+++ b/_includes/changelog.html
@@ -1,6 +1,6 @@
 <h2>Changes<a href="#changelog"></a></h2>
 <ul>
-  <li><code>v4.2.0</code> 5/9/17 - Replace <code>webpack</code> build with <code>rollup</code>. Replace <code>jshint</code> and <code>jscs</code> with <code>eslint</code>.</li>
+  <li><code>v4.2.0</code> 5/10/17 - Replace <code>webpack</code> build with <code>rollup</code>. Replace <code>jshint</code> and <code>jscs</code> with <code>eslint</code>. Add <code>filterMode</code> option.</li>
   <li><code>v4.1.1</code> 3/21/17 - the <code>before</code> styles for a <code>ShuffleItem</code> were not applied if the item didn&rsquo;t move.</li>
   <li><code>v4.1.0</code> 1/30/17 - Use webpack-2 to bundle Shuffle.</li>
   <li><code>v4.0.2</code> 9/15/16 - Update <code>custom-event-polyfill</code> dependency.</li>
diff --git a/_includes/options.html b/_includes/options.html
index b237b15..82e1e09 100644
--- a/_includes/options.html
+++ b/_includes/options.html
@@ -20,6 +20,7 @@ Shuffle.options = {
   staggerAmount: 15, // Transition delay offset for each item in milliseconds.
   staggerAmountMax: 250, // Maximum stagger delay in milliseconds.
   useTransforms: true, // Whether to use transforms or absolute positioning.
+  filterMode: Shuffle.FilterMode.ANY, // When using an array with filter(), the element passes the test if any of its groups are in the array. With "all", the element only passes if all groups are in the array.
 };</code></pre>
 </div>
 
diff --git a/dist/shuffle.js b/dist/shuffle.js
index 41fd4b0..3a6b19e 100644
--- a/dist/shuffle.js
+++ b/dist/shuffle.js
@@ -718,13 +718,7 @@ function toArray$$1(arrayLike) {
 }
 
 function arrayIncludes(array, obj) {
-  if (arguments.length === 2) {
-    return arrayIncludes(array)(obj);
-  }
-
-  return function (obj) {
-    return array.indexOf(obj) > -1;
-  };
+  return array.indexOf(obj) > -1;
 }
 
 // Used for unique instance variables
@@ -958,18 +952,21 @@ var Shuffle = function () {
     value: function _doesPassFilter(category, element) {
       if (typeof category === 'function') {
         return category.call(element, element, this);
-
-        // Check each element's data-groups attribute against the given category.
       }
+
+      // Check each element's data-groups attribute against the given category.
       var attr = element.getAttribute('data-' + Shuffle.FILTER_ATTRIBUTE_KEY);
       var keys = this.options.delimeter ? attr.split(this.options.delimeter) : JSON.parse(attr);
 
+      function testCategory(category) {
+        return arrayIncludes(keys, category);
+      }
+
       if (Array.isArray(category)) {
-        if (this.options.filterMode != Shuffle.filterMode.EXCLUSIVE) {
-          return category.every(arrayIncludes(keys));
-        } else {
-          return category.some(arrayIncludes(keys));
+        if (this.options.filterMode === Shuffle.FilterMode.ANY) {
+          return category.some(testCategory);
         }
+        return category.every(testCategory);
       }
 
       return arrayIncludes(keys, category);
@@ -1925,9 +1922,9 @@ Shuffle.Classes = Classes;
 /**
  * @enum {string}
  */
-Shuffle.filterMode = {
-  EXCLUSIVE: 'exclusive',
-  ADDITIVE: 'additive'
+Shuffle.FilterMode = {
+  ANY: 'any',
+  ALL: 'all'
 };
 
 // Overrideable options
@@ -1988,8 +1985,10 @@ Shuffle.options = {
   // Whether to use transforms or absolute positioning.
   useTransforms: true,
 
-  // Filters elements with "some" when 'exclusive' and with every on 'additive'
-  filterMode: Shuffle.filterMode.EXCLUSIVE
+  // Affects using an array with filter. e.g. `filter(['one', 'two'])`. With "any",
+  // the element passes the test if any of its groups are in the array. With "all",
+  // the element only passes if all groups are in the array.
+  filterMode: Shuffle.FilterMode.ANY
 };
 
 // Expose for testing. Hack at your own risk.
diff --git a/dist/shuffle.js.map b/dist/shuffle.js.map
index 75c0c11..e205ebe 100644
--- a/dist/shuffle.js.map
+++ b/dist/shuffle.js.map
@@ -1 +1 @@
-{"version":3,"file":"shuffle.js","sources":["../node_modules/custom-event-polyfill/custom-event-polyfill.js","../node_modules/matches-selector/index.js","../node_modules/array-uniq/index.js","../node_modules/xtend/immutable.js","../node_modules/throttleit/index.js","../node_modules/array-parallel/index.js","../src/get-number.js","../src/point.js","../src/classes.js","../src/shuffle-item.js","../src/computed-size.js","../src/get-number-style.js","../src/sorter.js","../src/on-transition-end.js","../src/array-max.js","../src/array-min.js","../src/layout.js","../src/shuffle.js"],"sourcesContent":["// Polyfill for creating CustomEvents on IE9/10/11\n\n// code pulled from:\n// https://github.com/d4tocchini/customevent-polyfill\n// https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent#Polyfill\n\ntry {\n    var ce = new window.CustomEvent('test');\n    ce.preventDefault();\n    if (ce.defaultPrevented !== true) {\n        // IE has problems with .preventDefault() on custom events\n        // http://stackoverflow.com/questions/23349191\n        throw new Error('Could not prevent default');\n    }\n} catch(e) {\n  var CustomEvent = function(event, params) {\n    var evt, origPrevent;\n    params = params || {\n      bubbles: false,\n      cancelable: false,\n      detail: undefined\n    };\n\n    evt = document.createEvent(\"CustomEvent\");\n    evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);\n    origPrevent = evt.preventDefault;\n    evt.preventDefault = function () {\n      origPrevent.call(this);\n      try {\n        Object.defineProperty(this, 'defaultPrevented', {\n          get: function () {\n            return true;\n          }\n        });\n      } catch(e) {\n        this.defaultPrevented = true;\n      }\n    };\n    return evt;\n  };\n\n  CustomEvent.prototype = window.Event.prototype;\n  window.CustomEvent = CustomEvent; // expose definition to window\n}\n","'use strict';\n\nvar proto = Element.prototype;\nvar vendor = proto.matches\n  || proto.matchesSelector\n  || proto.webkitMatchesSelector\n  || proto.mozMatchesSelector\n  || proto.msMatchesSelector\n  || proto.oMatchesSelector;\n\nmodule.exports = match;\n\n/**\n * Match `el` to `selector`.\n *\n * @param {Element} el\n * @param {String} selector\n * @return {Boolean}\n * @api public\n */\n\nfunction match(el, selector) {\n  if (vendor) return vendor.call(el, selector);\n  var nodes = el.parentNode.querySelectorAll(selector);\n  for (var i = 0; i < nodes.length; i++) {\n    if (nodes[i] == el) return true;\n  }\n  return false;\n}","'use strict';\n\n// there's 3 implementations written in increasing order of efficiency\n\n// 1 - no Set type is defined\nfunction uniqNoSet(arr) {\n\tvar ret = [];\n\n\tfor (var i = 0; i < arr.length; i++) {\n\t\tif (ret.indexOf(arr[i]) === -1) {\n\t\t\tret.push(arr[i]);\n\t\t}\n\t}\n\n\treturn ret;\n}\n\n// 2 - a simple Set type is defined\nfunction uniqSet(arr) {\n\tvar seen = new Set();\n\treturn arr.filter(function (el) {\n\t\tif (!seen.has(el)) {\n\t\t\tseen.add(el);\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t});\n}\n\n// 3 - a standard Set type is defined and it has a forEach method\nfunction uniqSetWithForEach(arr) {\n\tvar ret = [];\n\n\t(new Set(arr)).forEach(function (el) {\n\t\tret.push(el);\n\t});\n\n\treturn ret;\n}\n\n// V8 currently has a broken implementation\n// https://github.com/joyent/node/issues/8449\nfunction doesForEachActuallyWork() {\n\tvar ret = false;\n\n\t(new Set([true])).forEach(function (el) {\n\t\tret = el;\n\t});\n\n\treturn ret === true;\n}\n\nif ('Set' in global) {\n\tif (typeof Set.prototype.forEach === 'function' && doesForEachActuallyWork()) {\n\t\tmodule.exports = uniqSetWithForEach;\n\t} else {\n\t\tmodule.exports = uniqSet;\n\t}\n} else {\n\tmodule.exports = uniqNoSet;\n}\n","module.exports = extend\n\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\n\nfunction extend() {\n    var target = {}\n\n    for (var i = 0; i < arguments.length; i++) {\n        var source = arguments[i]\n\n        for (var key in source) {\n            if (hasOwnProperty.call(source, key)) {\n                target[key] = source[key]\n            }\n        }\n    }\n\n    return target\n}\n","module.exports = throttle;\n\n/**\n * Returns a new function that, when invoked, invokes `func` at most once per `wait` milliseconds.\n *\n * @param {Function} func Function to wrap.\n * @param {Number} wait Number of milliseconds that must elapse between `func` invocations.\n * @return {Function} A new function that wraps the `func` function passed in.\n */\n\nfunction throttle (func, wait) {\n  var ctx, args, rtn, timeoutID; // caching\n  var last = 0;\n\n  return function throttled () {\n    ctx = this;\n    args = arguments;\n    var delta = new Date() - last;\n    if (!timeoutID)\n      if (delta >= wait) call();\n      else timeoutID = setTimeout(call, wait - delta);\n    return rtn;\n  };\n\n  function call () {\n    timeoutID = 0;\n    last = +new Date();\n    rtn = func.apply(ctx, args);\n    ctx = null;\n    args = null;\n  }\n}\n","module.exports = function parallel(fns, context, callback) {\n  if (!callback) {\n    if (typeof context === 'function') {\n      callback = context\n      context = null\n    } else {\n      callback = noop\n    }\n  }\n\n  var pending = fns && fns.length\n  if (!pending) return callback(null, []);\n\n  var finished = false\n  var results = new Array(pending)\n\n  fns.forEach(context ? function (fn, i) {\n    fn.call(context, maybeDone(i))\n  } : function (fn, i) {\n    fn(maybeDone(i))\n  })\n\n  function maybeDone(i) {\n    return function (err, result) {\n      if (finished) return;\n\n      if (err) {\n        callback(err, results)\n        finished = true\n        return\n      }\n\n      results[i] = result\n\n      if (!--pending) callback(null, results);\n    }\n  }\n}\n\nfunction noop() {}\n","/**\n * Always returns a numeric value, given a value. Logic from jQuery's `isNumeric`.\n * @param {*} value Possibly numeric value.\n * @return {number} `value` or zero if `value` isn't numeric.\n */\nexport default function getNumber(value) {\n  return parseFloat(value) || 0;\n}\n","import getNumber from './get-number';\n\nclass Point {\n\n  /**\n   * Represents a coordinate pair.\n   * @param {number} [x=0] X.\n   * @param {number} [y=0] Y.\n   */\n  constructor(x, y) {\n    this.x = getNumber(x);\n    this.y = getNumber(y);\n  }\n\n  /**\n   * Whether two points are equal.\n   * @param {Point} a Point A.\n   * @param {Point} b Point B.\n   * @return {boolean}\n   */\n  static equals(a, b) {\n    return a.x === b.x && a.y === b.y;\n  }\n}\n\nexport default Point;\n","export default {\n  BASE: 'shuffle',\n  SHUFFLE_ITEM: 'shuffle-item',\n  VISIBLE: 'shuffle-item--visible',\n  HIDDEN: 'shuffle-item--hidden',\n};\n","import Point from './point';\nimport Classes from './classes';\n\nlet id = 0;\n\nclass ShuffleItem {\n  constructor(element) {\n    id += 1;\n    this.id = id;\n    this.element = element;\n    this.isVisible = true;\n  }\n\n  show() {\n    this.isVisible = true;\n    this.element.classList.remove(Classes.HIDDEN);\n    this.element.classList.add(Classes.VISIBLE);\n  }\n\n  hide() {\n    this.isVisible = false;\n    this.element.classList.remove(Classes.VISIBLE);\n    this.element.classList.add(Classes.HIDDEN);\n  }\n\n  init() {\n    this.addClasses([Classes.SHUFFLE_ITEM, Classes.VISIBLE]);\n    this.applyCss(ShuffleItem.Css.INITIAL);\n    this.scale = ShuffleItem.Scale.VISIBLE;\n    this.point = new Point();\n  }\n\n  addClasses(classes) {\n    classes.forEach((className) => {\n      this.element.classList.add(className);\n    });\n  }\n\n  removeClasses(classes) {\n    classes.forEach((className) => {\n      this.element.classList.remove(className);\n    });\n  }\n\n  applyCss(obj) {\n    Object.keys(obj).forEach((key) => {\n      this.element.style[key] = obj[key];\n    });\n  }\n\n  dispose() {\n    this.removeClasses([\n      Classes.HIDDEN,\n      Classes.VISIBLE,\n      Classes.SHUFFLE_ITEM,\n    ]);\n\n    this.element.removeAttribute('style');\n    this.element = null;\n  }\n}\n\nShuffleItem.Css = {\n  INITIAL: {\n    position: 'absolute',\n    top: 0,\n    left: 0,\n    visibility: 'visible',\n    'will-change': 'transform',\n  },\n  VISIBLE: {\n    before: {\n      opacity: 1,\n      visibility: 'visible',\n    },\n    after: {},\n  },\n  HIDDEN: {\n    before: {\n      opacity: 0,\n    },\n    after: {\n      visibility: 'hidden',\n    },\n  },\n};\n\nShuffleItem.Scale = {\n  VISIBLE: 1,\n  HIDDEN: 0.001,\n};\n\nexport default ShuffleItem;\n","const element = document.body || document.documentElement;\nconst e = document.createElement('div');\ne.style.cssText = 'width:10px;padding:2px;box-sizing:border-box;';\nelement.appendChild(e);\n\nconst width = window.getComputedStyle(e, null).width;\nconst ret = width === '10px';\n\nelement.removeChild(e);\n\nexport default ret;\n","import getNumber from './get-number';\nimport COMPUTED_SIZE_INCLUDES_PADDING from './computed-size';\n\n/**\n * Retrieve the computed style for an element, parsed as a float.\n * @param {Element} element Element to get style for.\n * @param {string} style Style property.\n * @param {CSSStyleDeclaration} [styles] Optionally include clean styles to\n *     use instead of asking for them again.\n * @return {number} The parsed computed value or zero if that fails because IE\n *     will return 'auto' when the element doesn't have margins instead of\n *     the computed style.\n */\nexport default function getNumberStyle(element, style,\n  styles = window.getComputedStyle(element, null)) {\n  let value = getNumber(styles[style]);\n\n  // Support IE<=11 and W3C spec.\n  if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'width') {\n    value += getNumber(styles.paddingLeft) +\n      getNumber(styles.paddingRight) +\n      getNumber(styles.borderLeftWidth) +\n      getNumber(styles.borderRightWidth);\n  } else if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'height') {\n    value += getNumber(styles.paddingTop) +\n      getNumber(styles.paddingBottom) +\n      getNumber(styles.borderTopWidth) +\n      getNumber(styles.borderBottomWidth);\n  }\n\n  return value;\n}\n","import xtend from 'xtend';\n\n/**\n * Fisher-Yates shuffle.\n * http://stackoverflow.com/a/962890/373422\n * https://bost.ocks.org/mike/shuffle/\n * @param {Array} array Array to shuffle.\n * @return {Array} Randomly sorted array.\n */\nfunction randomize(array) {\n  let n = array.length;\n\n  while (n) {\n    n -= 1;\n    const i = Math.floor(Math.random() * (n + 1));\n    const temp = array[i];\n    array[i] = array[n];\n    array[n] = temp;\n  }\n\n  return array;\n}\n\nconst defaults = {\n  // Use array.reverse() to reverse the results\n  reverse: false,\n\n  // Sorting function\n  by: null,\n\n  // If true, this will skip the sorting and return a randomized order in the array\n  randomize: false,\n\n  // Determines which property of each item in the array is passed to the\n  // sorting method.\n  key: 'element',\n};\n\n// You can return `undefined` from the `by` function to revert to DOM order.\nexport default function sorter(arr, options) {\n  const opts = xtend(defaults, options);\n  const original = [].slice.call(arr);\n  let revert = false;\n\n  if (!arr.length) {\n    return [];\n  }\n\n  if (opts.randomize) {\n    return randomize(arr);\n  }\n\n  // Sort the elements by the opts.by function.\n  // If we don't have opts.by, default to DOM order\n  if (typeof opts.by === 'function') {\n    arr.sort((a, b) => {\n      // Exit early if we already know we want to revert\n      if (revert) {\n        return 0;\n      }\n\n      const valA = opts.by(a[opts.key]);\n      const valB = opts.by(b[opts.key]);\n\n      // If both values are undefined, use the DOM order\n      if (valA === undefined && valB === undefined) {\n        revert = true;\n        return 0;\n      }\n\n      if (valA < valB || valA === 'sortFirst' || valB === 'sortLast') {\n        return -1;\n      }\n\n      if (valA > valB || valA === 'sortLast' || valB === 'sortFirst') {\n        return 1;\n      }\n\n      return 0;\n    });\n  }\n\n  // Revert to the original array if necessary\n  if (revert) {\n    return original;\n  }\n\n  if (opts.reverse) {\n    arr.reverse();\n  }\n\n  return arr;\n}\n","const transitions = {};\nconst eventName = 'transitionend';\nlet count = 0;\n\nfunction uniqueId() {\n  count += 1;\n  return eventName + count;\n}\n\nexport function cancelTransitionEnd(id) {\n  if (transitions[id]) {\n    transitions[id].element.removeEventListener(eventName, transitions[id].listener);\n    transitions[id] = null;\n    return true;\n  }\n\n  return false;\n}\n\nexport function onTransitionEnd(element, callback) {\n  const id = uniqueId();\n  const listener = (evt) => {\n    if (evt.currentTarget === evt.target) {\n      cancelTransitionEnd(id);\n      callback(evt);\n    }\n  };\n\n  element.addEventListener(eventName, listener);\n\n  transitions[id] = { element, listener };\n\n  return id;\n}\n","export default function arrayMax(array) {\n  return Math.max.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","export default function arrayMin(array) {\n  return Math.min.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","import Point from './point';\nimport arrayMax from './array-max';\nimport arrayMin from './array-min';\n\n/**\n * Determine the number of columns an items spans.\n * @param {number} itemWidth Width of the item.\n * @param {number} columnWidth Width of the column (includes gutter).\n * @param {number} columns Total number of columns\n * @param {number} threshold A buffer value for the size of the column to fit.\n * @return {number}\n */\nexport function getColumnSpan(itemWidth, columnWidth, columns, threshold) {\n  let columnSpan = itemWidth / columnWidth;\n\n  // If the difference between the rounded column span number and the\n  // calculated column span number is really small, round the number to\n  // make it fit.\n  if (Math.abs(Math.round(columnSpan) - columnSpan) < threshold) {\n    // e.g. columnSpan = 4.0089945390298745\n    columnSpan = Math.round(columnSpan);\n  }\n\n  // Ensure the column span is not more than the amount of columns in the whole layout.\n  return Math.min(Math.ceil(columnSpan), columns);\n}\n\n/**\n * Retrieves the column set to use for placement.\n * @param {number} columnSpan The number of columns this current item spans.\n * @param {number} columns The total columns in the grid.\n * @return {Array.<number>} An array of numbers represeting the column set.\n */\nexport function getAvailablePositions(positions, columnSpan, columns) {\n  // The item spans only one column.\n  if (columnSpan === 1) {\n    return positions;\n  }\n\n  // The item spans more than one column, figure out how many different\n  // places it could fit horizontally.\n  // The group count is the number of places within the positions this block\n  // could fit, ignoring the current positions of items.\n  // Imagine a 2 column brick as the second item in a 4 column grid with\n  // 10px height each. Find the places it would fit:\n  // [20, 10, 10, 0]\n  //  |   |   |\n  //  *   *   *\n  //\n  // Then take the places which fit and get the bigger of the two:\n  // max([20, 10]), max([10, 10]), max([10, 0]) = [20, 10, 0]\n  //\n  // Next, find the first smallest number (the short column).\n  // [20, 10, 0]\n  //          |\n  //          *\n  //\n  // And that's where it should be placed!\n  //\n  // Another example where the second column's item extends past the first:\n  // [10, 20, 10, 0] => [20, 20, 10] => 10\n  const available = [];\n\n  // For how many possible positions for this item there are.\n  for (let i = 0; i <= columns - columnSpan; i++) {\n    // Find the bigger value for each place it could fit.\n    available.push(arrayMax(positions.slice(i, i + columnSpan)));\n  }\n\n  return available;\n}\n\n/**\n * Find index of short column, the first from the left where this item will go.\n *\n * @param {Array.<number>} positions The array to search for the smallest number.\n * @param {number} buffer Optional buffer which is very useful when the height\n *     is a percentage of the width.\n * @return {number} Index of the short column.\n */\nexport function getShortColumn(positions, buffer) {\n  const minPosition = arrayMin(positions);\n  for (let i = 0, len = positions.length; i < len; i++) {\n    if (positions[i] >= minPosition - buffer && positions[i] <= minPosition + buffer) {\n      return i;\n    }\n  }\n\n  return 0;\n}\n\n/**\n * Determine the location of the next item, based on its size.\n * @param {Object} itemSize Object with width and height.\n * @param {Array.<number>} positions Positions of the other current items.\n * @param {number} gridSize The column width or row height.\n * @param {number} total The total number of columns or rows.\n * @param {number} threshold Buffer value for the column to fit.\n * @param {number} buffer Vertical buffer for the height of items.\n * @return {Point}\n */\nexport function getItemPosition({ itemSize, positions, gridSize, total, threshold, buffer }) {\n  const span = getColumnSpan(itemSize.width, gridSize, total, threshold);\n  const setY = getAvailablePositions(positions, span, total);\n  const shortColumnIndex = getShortColumn(setY, buffer);\n\n  // Position the item\n  const point = new Point(\n    Math.round(gridSize * shortColumnIndex),\n    Math.round(setY[shortColumnIndex]));\n\n  // Update the columns array with the new values for each column.\n  // e.g. before the update the columns could be [250, 0, 0, 0] for an item\n  // which spans 2 columns. After it would be [250, itemHeight, itemHeight, 0].\n  const setHeight = setY[shortColumnIndex] + itemSize.height;\n  for (let i = 0; i < span; i++) {\n    positions[shortColumnIndex + i] = setHeight;\n  }\n\n  return point;\n}\n","import 'custom-event-polyfill';\nimport matches from 'matches-selector';\nimport arrayUnique from 'array-uniq';\nimport xtend from 'xtend';\nimport throttle from 'throttleit';\nimport parallel from 'array-parallel';\nimport Point from './point';\nimport ShuffleItem from './shuffle-item';\nimport Classes from './classes';\nimport getNumberStyle from './get-number-style';\nimport sorter from './sorter';\nimport { onTransitionEnd, cancelTransitionEnd } from './on-transition-end';\nimport { getItemPosition, getColumnSpan, getAvailablePositions, getShortColumn } from './layout';\nimport arrayMax from './array-max';\n\nfunction toArray(arrayLike) {\n  return Array.prototype.slice.call(arrayLike);\n}\n\nfunction arrayIncludes(array, obj) {\n  if (arguments.length === 2) {\n    return arrayIncludes(array)(obj);\n  }\n\n  return obj => array.indexOf(obj) > -1;\n}\n\n// Used for unique instance variables\nlet id = 0;\n\nclass Shuffle {\n\n  /**\n   * Categorize, sort, and filter a responsive grid of items.\n   *\n   * @param {Element} element An element which is the parent container for the grid items.\n   * @param {Object} [options=Shuffle.options] Options object.\n   * @constructor\n   */\n  constructor(element, options = {}) {\n    this.options = xtend(Shuffle.options, options);\n\n    this.useSizer = false;\n    this.lastSort = {};\n    this.group = Shuffle.ALL_ITEMS;\n    this.lastFilter = Shuffle.ALL_ITEMS;\n    this.isEnabled = true;\n    this.isDestroyed = false;\n    this.isInitialized = false;\n    this._transitions = [];\n    this.isTransitioning = false;\n    this._queue = [];\n\n    const el = this._getElementOption(element);\n\n    if (!el) {\n      throw new TypeError('Shuffle needs to be initialized with an element.');\n    }\n\n    this.element = el;\n    this.id = 'shuffle_' + id;\n    id += 1;\n\n    this._init();\n    this.isInitialized = true;\n  }\n\n  _init() {\n    this.items = this._getItems();\n\n    this.options.sizer = this._getElementOption(this.options.sizer);\n\n    if (this.options.sizer) {\n      this.useSizer = true;\n    }\n\n    // Add class and invalidate styles\n    this.element.classList.add(Shuffle.Classes.BASE);\n\n    // Set initial css for each item\n    this._initItems();\n\n    // Bind resize events\n    this._onResize = this._getResizeFunction();\n    window.addEventListener('resize', this._onResize);\n\n    // Get container css all in one request. Causes reflow\n    const containerCss = window.getComputedStyle(this.element, null);\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // Add styles to the container if it doesn't have them.\n    this._validateStyles(containerCss);\n\n    // We already got the container's width above, no need to cause another\n    // reflow getting it again... Calculate the number of columns there will be\n    this._setColumns(containerWidth);\n\n    // Kick off!\n    this.filter(this.options.group, this.options.initialSort);\n\n    // The shuffle items haven't had transitions set on them yet so the user\n    // doesn't see the first layout. Set them now that the first layout is done.\n    // First, however, a synchronous layout must be caused for the previous\n    // styles to be applied without transitions.\n    this.element.offsetWidth; // eslint-disable-line no-unused-expressions\n    this._setTransitions();\n    this.element.style.transition = 'height ' + this.options.speed + 'ms ' + this.options.easing;\n  }\n\n  /**\n   * Returns a throttled and proxied function for the resize handler.\n   * @return {Function}\n   * @private\n   */\n  _getResizeFunction() {\n    const resizeFunction = this._handleResize.bind(this);\n    return this.options.throttle ?\n        this.options.throttle(resizeFunction, this.options.throttleTime) :\n        resizeFunction;\n  }\n\n  /**\n   * Retrieve an element from an option.\n   * @param {string|jQuery|Element} option The option to check.\n   * @return {?Element} The plain element or null.\n   * @private\n   */\n  _getElementOption(option) {\n    // If column width is a string, treat is as a selector and search for the\n    // sizer element within the outermost container\n    if (typeof option === 'string') {\n      return this.element.querySelector(option);\n\n    // Check for an element\n    } else if (option && option.nodeType && option.nodeType === 1) {\n      return option;\n\n    // Check for jQuery object\n    } else if (option && option.jquery) {\n      return option[0];\n    }\n\n    return null;\n  }\n\n  /**\n   * Ensures the shuffle container has the css styles it needs applied to it.\n   * @param {Object} styles Key value pairs for position and overflow.\n   * @private\n   */\n  _validateStyles(styles) {\n    // Position cannot be static.\n    if (styles.position === 'static') {\n      this.element.style.position = 'relative';\n    }\n\n    // Overflow has to be hidden.\n    if (styles.overflow !== 'hidden') {\n      this.element.style.overflow = 'hidden';\n    }\n  }\n\n  /**\n   * Filter the elements by a category.\n   * @param {string} [category] Category to filter by. If it's given, the last\n   *     category will be used to filter the items.\n   * @param {Array} [collection] Optionally filter a collection. Defaults to\n   *     all the items.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _filter(category = this.lastFilter, collection = this.items) {\n    const set = this._getFilteredSets(category, collection);\n\n    // Individually add/remove hidden/visible classes\n    this._toggleFilterClasses(set);\n\n    // Save the last filter in case elements are appended.\n    this.lastFilter = category;\n\n    // This is saved mainly because providing a filter function (like searching)\n    // will overwrite the `lastFilter` property every time its called.\n    if (typeof category === 'string') {\n      this.group = category;\n    }\n\n    return set;\n  }\n\n  /**\n   * Returns an object containing the visible and hidden elements.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Array.<Element>} items A collection of items to filter.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _getFilteredSets(category, items) {\n    let visible = [];\n    const hidden = [];\n\n    // category === 'all', add visible class to everything\n    if (category === Shuffle.ALL_ITEMS) {\n      visible = items;\n\n    // Loop through each item and use provided function to determine\n    // whether to hide it or not.\n    } else {\n      items.forEach((item) => {\n        if (this._doesPassFilter(category, item.element)) {\n          visible.push(item);\n        } else {\n          hidden.push(item);\n        }\n      });\n    }\n\n    return {\n      visible,\n      hidden,\n    };\n  }\n\n  /**\n   * Test an item to see if it passes a category.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Element} element An element to test.\n   * @return {boolean} Whether it passes the category/filter.\n   * @private\n   */\n  _doesPassFilter(category, element) {\n    if (typeof category === 'function') {\n      return category.call(element, element, this);\n\n    // Check each element's data-groups attribute against the given category.\n    }\n    const attr = element.getAttribute('data-' + Shuffle.FILTER_ATTRIBUTE_KEY);\n    const keys = this.options.delimeter ?\n          attr.split(this.options.delimeter) :\n          JSON.parse(attr);\n\n    if (Array.isArray(category)) {\n      if(this.options.filterMode!=Shuffle.filterMode.EXCLUSIVE){\n        return category.every(arrayIncludes(keys));\n      } else {\n        return category.some(arrayIncludes(keys));\n      }\n    }\n\n    return arrayIncludes(keys, category);\n  }\n\n  /**\n   * Toggles the visible and hidden class names.\n   * @param {{visible, hidden}} Object with visible and hidden arrays.\n   * @private\n   */\n  _toggleFilterClasses({ visible, hidden }) {\n    visible.forEach((item) => {\n      item.show();\n    });\n\n    hidden.forEach((item) => {\n      item.hide();\n    });\n  }\n\n  /**\n   * Set the initial css for each item\n   * @param {Array.<ShuffleItem>} [items] Optionally specifiy at set to initialize.\n   * @private\n   */\n  _initItems(items = this.items) {\n    items.forEach((item) => {\n      item.init();\n    });\n  }\n\n  /**\n   * Remove element reference and styles.\n   * @private\n   */\n  _disposeItems(items = this.items) {\n    items.forEach((item) => {\n      item.dispose();\n    });\n  }\n\n  /**\n   * Updates the visible item count.\n   * @private\n   */\n  _updateItemCount() {\n    this.visibleItems = this._getFilteredItems().length;\n  }\n\n  /**\n   * Sets css transform transition on a group of elements. This is not executed\n   * at the same time as `item.init` so that transitions don't occur upon\n   * initialization of Shuffle.\n   * @param {Array.<ShuffleItem>} items Shuffle items to set transitions on.\n   * @private\n   */\n  _setTransitions(items = this.items) {\n    const speed = this.options.speed;\n    const easing = this.options.easing;\n\n    const str = this.options.useTransforms ?\n      `transform ${speed}ms ${easing}, opacity ${speed}ms ${easing}` :\n      `top ${speed}ms ${easing}, left ${speed}ms ${easing}, opacity ${speed}ms ${easing}`;\n\n    items.forEach((item) => {\n      item.element.style.transition = str;\n    });\n  }\n\n  _getItems() {\n    return toArray(this.element.children)\n      .filter(el => matches(el, this.options.itemSelector))\n      .map(el => new ShuffleItem(el));\n  }\n\n  /**\n   * When new elements are added to the shuffle container, update the array of\n   * items because that is the order `_layout` calls them.\n   */\n  _updateItemsOrder() {\n    const children = this.element.children;\n    this.items = sorter(this.items, {\n      by(element) {\n        return Array.prototype.indexOf.call(children, element);\n      },\n    });\n  }\n\n  _getFilteredItems() {\n    return this.items.filter(item => item.isVisible);\n  }\n\n  _getConcealedItems() {\n    return this.items.filter(item => !item.isVisible);\n  }\n\n  /**\n   * Returns the column size, based on column width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @param {number} gutterSize Size of the gutters.\n   * @return {number}\n   * @private\n   */\n  _getColumnSize(containerWidth, gutterSize) {\n    let size;\n\n    // If the columnWidth property is a function, then the grid is fluid\n    if (typeof this.options.columnWidth === 'function') {\n      size = this.options.columnWidth(containerWidth);\n\n    // columnWidth option isn't a function, are they using a sizing element?\n    } else if (this.useSizer) {\n      size = Shuffle.getSize(this.options.sizer).width;\n\n    // if not, how about the explicitly set option?\n    } else if (this.options.columnWidth) {\n      size = this.options.columnWidth;\n\n    // or use the size of the first item\n    } else if (this.items.length > 0) {\n      size = Shuffle.getSize(this.items[0].element, true).width;\n\n    // if there's no items, use size of container\n    } else {\n      size = containerWidth;\n    }\n\n    // Don't let them set a column width of zero.\n    if (size === 0) {\n      size = containerWidth;\n    }\n\n    return size + gutterSize;\n  }\n\n  /**\n   * Returns the gutter size, based on gutter width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @return {number}\n   * @private\n   */\n  _getGutterSize(containerWidth) {\n    let size;\n    if (typeof this.options.gutterWidth === 'function') {\n      size = this.options.gutterWidth(containerWidth);\n    } else if (this.useSizer) {\n      size = getNumberStyle(this.options.sizer, 'marginLeft');\n    } else {\n      size = this.options.gutterWidth;\n    }\n\n    return size;\n  }\n\n  /**\n   * Calculate the number of columns to be used. Gets css if using sizer element.\n   * @param {number} [containerWidth] Optionally specify a container width if\n   *    it's already available.\n   */\n  _setColumns(containerWidth = Shuffle.getSize(this.element).width) {\n    const gutter = this._getGutterSize(containerWidth);\n    const columnWidth = this._getColumnSize(containerWidth, gutter);\n    let calculatedColumns = (containerWidth + gutter) / columnWidth;\n\n    // Widths given from getStyles are not precise enough...\n    if (Math.abs(Math.round(calculatedColumns) - calculatedColumns) <\n        this.options.columnThreshold) {\n      // e.g. calculatedColumns = 11.998876\n      calculatedColumns = Math.round(calculatedColumns);\n    }\n\n    this.cols = Math.max(Math.floor(calculatedColumns), 1);\n    this.containerWidth = containerWidth;\n    this.colWidth = columnWidth;\n  }\n\n  /**\n   * Adjust the height of the grid\n   */\n  _setContainerSize() {\n    this.element.style.height = this._getContainerSize() + 'px';\n  }\n\n  /**\n   * Based on the column heights, it returns the biggest one.\n   * @return {number}\n   * @private\n   */\n  _getContainerSize() {\n    return arrayMax(this.positions);\n  }\n\n  /**\n   * Get the clamped stagger amount.\n   * @param {number} index Index of the item to be staggered.\n   * @return {number}\n   */\n  _getStaggerAmount(index) {\n    return Math.min(index * this.options.staggerAmount, this.options.staggerAmountMax);\n  }\n\n  /**\n   * @return {boolean} Whether the event was prevented or not.\n   */\n  _dispatch(name, details = {}) {\n    if (this.isDestroyed) {\n      return false;\n    }\n\n    details.shuffle = this;\n    return !this.element.dispatchEvent(new CustomEvent(name, {\n      bubbles: true,\n      cancelable: false,\n      detail: details,\n    }));\n  }\n\n  /**\n   * Zeros out the y columns array, which is used to determine item placement.\n   * @private\n   */\n  _resetCols() {\n    let i = this.cols;\n    this.positions = [];\n    while (i) {\n      i -= 1;\n      this.positions.push(0);\n    }\n  }\n\n  /**\n   * Loops through each item that should be shown and calculates the x, y position.\n   * @param {Array.<ShuffleItem>} items Array of items that will be shown/layed\n   *     out in order in their array.\n   */\n  _layout(items) {\n    let count = 0;\n    items.forEach((item) => {\n      const currPos = item.point;\n      const currScale = item.scale;\n      const itemSize = Shuffle.getSize(item.element, true);\n      const pos = this._getItemPosition(itemSize);\n\n      function callback() {\n        item.element.style.transitionDelay = '';\n        item.applyCss(ShuffleItem.Css.VISIBLE.after);\n      }\n\n      // If the item will not change its position, do not add it to the render\n      // queue. Transitions don't fire when setting a property to the same value.\n      if (Point.equals(currPos, pos) && currScale === ShuffleItem.Scale.VISIBLE) {\n        item.applyCss(ShuffleItem.Css.VISIBLE.before);\n        callback();\n        return;\n      }\n\n      item.point = pos;\n      item.scale = ShuffleItem.Scale.VISIBLE;\n\n      // Use xtend here to clone the object so that the `before` object isn't\n      // modified when the transition delay is added.\n      const styles = xtend(ShuffleItem.Css.VISIBLE.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Determine the location of the next item, based on its size.\n   * @param {{width: number, height: number}} itemSize Object with width and height.\n   * @return {Point}\n   * @private\n   */\n  _getItemPosition(itemSize) {\n    return getItemPosition({\n      itemSize,\n      positions: this.positions,\n      gridSize: this.colWidth,\n      total: this.cols,\n      threshold: this.options.columnThreshold,\n      buffer: this.options.buffer,\n    });\n  }\n\n  /**\n   * Hides the elements that don't match our filter.\n   * @param {Array.<ShuffleItem>} collection Collection to shrink.\n   * @private\n   */\n  _shrink(collection = this._getConcealedItems()) {\n    let count = 0;\n    collection.forEach((item) => {\n      function callback() {\n        item.applyCss(ShuffleItem.Css.HIDDEN.after);\n      }\n\n      // Continuing would add a transitionend event listener to the element, but\n      // that listener would not execute because the transform and opacity would\n      // stay the same.\n      // The callback is executed here because it is not guaranteed to be called\n      // after the transitionend event because the transitionend could be\n      // canceled if another animation starts.\n      if (item.scale === ShuffleItem.Scale.HIDDEN) {\n        item.applyCss(ShuffleItem.Css.HIDDEN.before);\n        callback();\n        return;\n      }\n\n      item.scale = ShuffleItem.Scale.HIDDEN;\n\n      const styles = xtend(ShuffleItem.Css.HIDDEN.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Resize handler.\n   * @private\n   */\n  _handleResize() {\n    // If shuffle is disabled, destroyed, don't do anything\n    if (!this.isEnabled || this.isDestroyed) {\n      return;\n    }\n\n    // Will need to check height in the future if it's layed out horizontaly\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // containerWidth hasn't changed, don't do anything\n    if (containerWidth === this.containerWidth) {\n      return;\n    }\n\n    this.update();\n  }\n\n  /**\n   * Returns styles which will be applied to the an item for a transition.\n   * @param {Object} obj Transition options.\n   * @return {!Object} Transforms for transitions, left/top for animate.\n   * @private\n   */\n  _getStylesForTransition({ item, styles }) {\n    if (!styles.transitionDelay) {\n      styles.transitionDelay = '0ms';\n    }\n\n    const x = item.point.x;\n    const y = item.point.y;\n\n    if (this.options.useTransforms) {\n      styles.transform = `translate(${x}px, ${y}px) scale(${item.scale})`;\n    } else {\n      styles.left = x + 'px';\n      styles.top = y + 'px';\n    }\n\n    return styles;\n  }\n\n  /**\n   * Listen for the transition end on an element and execute the itemCallback\n   * when it finishes.\n   * @param {Element} element Element to listen on.\n   * @param {Function} itemCallback Callback for the item.\n   * @param {Function} done Callback to notify `parallel` that this one is done.\n   */\n  _whenTransitionDone(element, itemCallback, done) {\n    const id = onTransitionEnd(element, (evt) => {\n      itemCallback();\n      done(null, evt);\n    });\n\n    this._transitions.push(id);\n  }\n\n  /**\n   * Return a function which will set CSS styles and call the `done` function\n   * when (if) the transition finishes.\n   * @param {Object} opts Transition object.\n   * @return {Function} A function to be called with a `done` function.\n   */\n  _getTransitionFunction(opts) {\n    return (done) => {\n      opts.item.applyCss(this._getStylesForTransition(opts));\n      this._whenTransitionDone(opts.item.element, opts.callback, done);\n    };\n  }\n\n  /**\n   * Execute the styles gathered in the style queue. This applies styles to elements,\n   * triggering transitions.\n   * @private\n   */\n  _processQueue() {\n    if (this.isTransitioning) {\n      this._cancelMovement();\n    }\n\n    const hasSpeed = this.options.speed > 0;\n    const hasQueue = this._queue.length > 0;\n\n    if (hasQueue && hasSpeed && this.isInitialized) {\n      this._startTransitions(this._queue);\n    } else if (hasQueue) {\n      this._styleImmediately(this._queue);\n      this._dispatchLayout();\n\n    // A call to layout happened, but none of the newly visible items will\n    // change position or the transition duration is zero, which will not trigger\n    // the transitionend event.\n    } else {\n      this._dispatchLayout();\n    }\n\n    // Remove everything in the style queue\n    this._queue.length = 0;\n  }\n\n  /**\n   * Wait for each transition to finish, the emit the layout event.\n   * @param {Array.<Object>} transitions Array of transition objects.\n   */\n  _startTransitions(transitions) {\n    // Set flag that shuffle is currently in motion.\n    this.isTransitioning = true;\n\n    // Create an array of functions to be called.\n    const callbacks = transitions.map(obj => this._getTransitionFunction(obj));\n\n    parallel(callbacks, this._movementFinished.bind(this));\n  }\n\n  _cancelMovement() {\n    // Remove the transition end event for each listener.\n    this._transitions.forEach(cancelTransitionEnd);\n\n    // Reset the array.\n    this._transitions.length = 0;\n\n    // Show it's no longer active.\n    this.isTransitioning = false;\n  }\n\n  /**\n   * Apply styles without a transition.\n   * @param {Array.<Object>} objects Array of transition objects.\n   * @private\n   */\n  _styleImmediately(objects) {\n    if (objects.length) {\n      const elements = objects.map(obj => obj.item.element);\n\n      Shuffle._skipTransitions(elements, () => {\n        objects.forEach((obj) => {\n          obj.item.applyCss(this._getStylesForTransition(obj));\n          obj.callback();\n        });\n      });\n    }\n  }\n\n  _movementFinished() {\n    this._transitions.length = 0;\n    this.isTransitioning = false;\n    this._dispatchLayout();\n  }\n\n  _dispatchLayout() {\n    this._dispatch(Shuffle.EventType.LAYOUT);\n  }\n\n  /**\n   * The magic. This is what makes the plugin 'shuffle'\n   * @param {string|Function|Array.<string>} [category] Category to filter by.\n   *     Can be a function, string, or array of strings.\n   * @param {Object} [sortObj] A sort object which can sort the visible set\n   */\n  filter(category, sortObj) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    if (!category || (category && category.length === 0)) {\n      category = Shuffle.ALL_ITEMS; // eslint-disable-line no-param-reassign\n    }\n\n    this._filter(category);\n\n    // Shrink each hidden item\n    this._shrink();\n\n    // How many visible elements?\n    this._updateItemCount();\n\n    // Update transforms on visible elements so they will animate to their new positions.\n    this.sort(sortObj);\n  }\n\n  /**\n   * Gets the visible elements, sorts them, and passes them to layout.\n   * @param {Object} opts the options object for the sorted plugin\n   */\n  sort(opts = this.lastSort) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    this._resetCols();\n\n    let items = this._getFilteredItems();\n    items = sorter(items, opts);\n\n    this._layout(items);\n\n    // `_layout` always happens after `_shrink`, so it's safe to process the style\n    // queue here with styles from the shrink method.\n    this._processQueue();\n\n    // Adjust the height of the container.\n    this._setContainerSize();\n\n    this.lastSort = opts;\n  }\n\n  /**\n   * Reposition everything.\n   * @param {boolean} isOnlyLayout If true, column and gutter widths won't be\n   *     recalculated.\n   */\n  update(isOnlyLayout) {\n    if (this.isEnabled) {\n      if (!isOnlyLayout) {\n        // Get updated colCount\n        this._setColumns();\n      }\n\n      // Layout items\n      this.sort();\n    }\n  }\n\n  /**\n   * Use this instead of `update()` if you don't need the columns and gutters updated\n   * Maybe an image inside `shuffle` loaded (and now has a height), which means calculations\n   * could be off.\n   */\n  layout() {\n    this.update(true);\n  }\n\n  /**\n   * New items have been appended to shuffle. Mix them in with the current\n   * filter or sort status.\n   * @param {Array.<Element>} newItems Collection of new items.\n   */\n  add(newItems) {\n    const items = arrayUnique(newItems).map(el => new ShuffleItem(el));\n\n    // Add classes and set initial positions.\n    this._initItems(items);\n\n    // Add transition to each item.\n    this._setTransitions(items);\n\n    // Update the list of items.\n    this.items = this.items.concat(items);\n    this._updateItemsOrder();\n    this.filter(this.lastFilter);\n  }\n\n  /**\n   * Disables shuffle from updating dimensions and layout on resize\n   */\n  disable() {\n    this.isEnabled = false;\n  }\n\n  /**\n   * Enables shuffle again\n   * @param {boolean} [isUpdateLayout=true] if undefined, shuffle will update columns and gutters\n   */\n  enable(isUpdateLayout) {\n    this.isEnabled = true;\n    if (isUpdateLayout !== false) {\n      this.update();\n    }\n  }\n\n  /**\n   * Remove 1 or more shuffle items\n   * @param {Array.<Element>} elements An array containing one or more\n   *     elements in shuffle\n   * @return {Shuffle} The shuffle object\n   */\n  remove(elements) {\n    if (!elements.length) {\n      return;\n    }\n\n    const collection = arrayUnique(elements);\n\n    const oldItems = collection\n      .map(element => this.getItemByElement(element))\n      .filter(item => !!item);\n\n    const handleLayout = () => {\n      this.element.removeEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n      this._disposeItems(oldItems);\n\n      // Remove the collection in the callback\n      collection.forEach((element) => {\n        element.parentNode.removeChild(element);\n      });\n\n      this._dispatch(Shuffle.EventType.REMOVED, { collection });\n    };\n\n    // Hide collection first.\n    this._toggleFilterClasses({\n      visible: [],\n      hidden: oldItems,\n    });\n\n    this._shrink(oldItems);\n\n    this.sort();\n\n    // Update the list of items here because `remove` could be called again\n    // with an item that is in the process of being removed.\n    this.items = this.items.filter(item => !arrayIncludes(oldItems, item));\n    this._updateItemCount();\n\n    this.element.addEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n  }\n\n  /**\n   * Retrieve a shuffle item by its element.\n   * @param {Element} element Element to look for.\n   * @return {?ShuffleItem} A shuffle item or null if it's not found.\n   */\n  getItemByElement(element) {\n    for (let i = this.items.length - 1; i >= 0; i--) {\n      if (this.items[i].element === element) {\n        return this.items[i];\n      }\n    }\n\n    return null;\n  }\n\n  /**\n   * Destroys shuffle, removes events, styles, and classes\n   */\n  destroy() {\n    this._cancelMovement();\n    window.removeEventListener('resize', this._onResize);\n\n    // Reset container styles\n    this.element.classList.remove('shuffle');\n    this.element.removeAttribute('style');\n\n    // Reset individual item styles\n    this._disposeItems();\n\n    // Null DOM references\n    this.items = null;\n    this.options.sizer = null;\n    this.element = null;\n    this._transitions = null;\n\n    // Set a flag so if a debounced resize has been triggered,\n    // it can first check if it is actually isDestroyed and not doing anything\n    this.isDestroyed = true;\n  }\n\n  /**\n   * Returns the outer width of an element, optionally including its margins.\n   *\n   * There are a few different methods for getting the width of an element, none of\n   * which work perfectly for all Shuffle's use cases.\n   *\n   * 1. getBoundingClientRect() `left` and `right` properties.\n   *   - Accounts for transform scaled elements, making it useless for Shuffle\n   *   elements which have shrunk.\n   * 2. 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+{"version":3,"file":"shuffle.js","sources":["../node_modules/custom-event-polyfill/custom-event-polyfill.js","../node_modules/matches-selector/index.js","../node_modules/array-uniq/index.js","../node_modules/xtend/immutable.js","../node_modules/throttleit/index.js","../node_modules/array-parallel/index.js","../src/get-number.js","../src/point.js","../src/classes.js","../src/shuffle-item.js","../src/computed-size.js","../src/get-number-style.js","../src/sorter.js","../src/on-transition-end.js","../src/array-max.js","../src/array-min.js","../src/layout.js","../src/shuffle.js"],"sourcesContent":["// Polyfill for creating CustomEvents on IE9/10/11\n\n// code pulled from:\n// https://github.com/d4tocchini/customevent-polyfill\n// https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent#Polyfill\n\ntry {\n    var ce = new window.CustomEvent('test');\n    ce.preventDefault();\n    if (ce.defaultPrevented !== true) {\n        // IE has problems with .preventDefault() on custom events\n        // http://stackoverflow.com/questions/23349191\n        throw new Error('Could not prevent default');\n    }\n} catch(e) {\n  var CustomEvent = function(event, params) {\n    var evt, origPrevent;\n    params = params || {\n      bubbles: false,\n      cancelable: false,\n      detail: undefined\n    };\n\n    evt = document.createEvent(\"CustomEvent\");\n    evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);\n    origPrevent = evt.preventDefault;\n    evt.preventDefault = function () {\n      origPrevent.call(this);\n      try {\n        Object.defineProperty(this, 'defaultPrevented', {\n          get: function () {\n            return true;\n          }\n        });\n      } catch(e) {\n        this.defaultPrevented = true;\n      }\n    };\n    return evt;\n  };\n\n  CustomEvent.prototype = window.Event.prototype;\n  window.CustomEvent = CustomEvent; // expose definition to window\n}\n","'use strict';\n\nvar proto = Element.prototype;\nvar vendor = proto.matches\n  || proto.matchesSelector\n  || proto.webkitMatchesSelector\n  || proto.mozMatchesSelector\n  || proto.msMatchesSelector\n  || proto.oMatchesSelector;\n\nmodule.exports = match;\n\n/**\n * Match `el` to `selector`.\n *\n * @param {Element} el\n * @param {String} selector\n * @return {Boolean}\n * @api public\n */\n\nfunction match(el, selector) {\n  if (vendor) return vendor.call(el, selector);\n  var nodes = el.parentNode.querySelectorAll(selector);\n  for (var i = 0; i < nodes.length; i++) {\n    if (nodes[i] == el) return true;\n  }\n  return false;\n}","'use strict';\n\n// there's 3 implementations written in increasing order of efficiency\n\n// 1 - no Set type is defined\nfunction uniqNoSet(arr) {\n\tvar ret = [];\n\n\tfor (var i = 0; i < arr.length; i++) {\n\t\tif (ret.indexOf(arr[i]) === -1) {\n\t\t\tret.push(arr[i]);\n\t\t}\n\t}\n\n\treturn ret;\n}\n\n// 2 - a simple Set type is defined\nfunction uniqSet(arr) {\n\tvar seen = new Set();\n\treturn arr.filter(function (el) {\n\t\tif (!seen.has(el)) {\n\t\t\tseen.add(el);\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t});\n}\n\n// 3 - a standard Set type is defined and it has a forEach method\nfunction uniqSetWithForEach(arr) {\n\tvar ret = [];\n\n\t(new Set(arr)).forEach(function (el) {\n\t\tret.push(el);\n\t});\n\n\treturn ret;\n}\n\n// V8 currently has a broken implementation\n// https://github.com/joyent/node/issues/8449\nfunction doesForEachActuallyWork() {\n\tvar ret = false;\n\n\t(new Set([true])).forEach(function (el) {\n\t\tret = el;\n\t});\n\n\treturn ret === true;\n}\n\nif ('Set' in global) {\n\tif (typeof Set.prototype.forEach === 'function' && doesForEachActuallyWork()) {\n\t\tmodule.exports = uniqSetWithForEach;\n\t} else {\n\t\tmodule.exports = uniqSet;\n\t}\n} else {\n\tmodule.exports = uniqNoSet;\n}\n","module.exports = extend\n\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\n\nfunction extend() {\n    var target = {}\n\n    for (var i = 0; i < arguments.length; i++) {\n        var source = arguments[i]\n\n        for (var key in source) {\n            if (hasOwnProperty.call(source, key)) {\n                target[key] = source[key]\n            }\n        }\n    }\n\n    return target\n}\n","module.exports = throttle;\n\n/**\n * Returns a new function that, when invoked, invokes `func` at most once per `wait` milliseconds.\n *\n * @param {Function} func Function to wrap.\n * @param {Number} wait Number of milliseconds that must elapse between `func` invocations.\n * @return {Function} A new function that wraps the `func` function passed in.\n */\n\nfunction throttle (func, wait) {\n  var ctx, args, rtn, timeoutID; // caching\n  var last = 0;\n\n  return function throttled () {\n    ctx = this;\n    args = arguments;\n    var delta = new Date() - last;\n    if (!timeoutID)\n      if (delta >= wait) call();\n      else timeoutID = setTimeout(call, wait - delta);\n    return rtn;\n  };\n\n  function call () {\n    timeoutID = 0;\n    last = +new Date();\n    rtn = func.apply(ctx, args);\n    ctx = null;\n    args = null;\n  }\n}\n","module.exports = function parallel(fns, context, callback) {\n  if (!callback) {\n    if (typeof context === 'function') {\n      callback = context\n      context = null\n    } else {\n      callback = noop\n    }\n  }\n\n  var pending = fns && fns.length\n  if (!pending) return callback(null, []);\n\n  var finished = false\n  var results = new Array(pending)\n\n  fns.forEach(context ? function (fn, i) {\n    fn.call(context, maybeDone(i))\n  } : function (fn, i) {\n    fn(maybeDone(i))\n  })\n\n  function maybeDone(i) {\n    return function (err, result) {\n      if (finished) return;\n\n      if (err) {\n        callback(err, results)\n        finished = true\n        return\n      }\n\n      results[i] = result\n\n      if (!--pending) callback(null, results);\n    }\n  }\n}\n\nfunction noop() {}\n","/**\n * Always returns a numeric value, given a value. Logic from jQuery's `isNumeric`.\n * @param {*} value Possibly numeric value.\n * @return {number} `value` or zero if `value` isn't numeric.\n */\nexport default function getNumber(value) {\n  return parseFloat(value) || 0;\n}\n","import getNumber from './get-number';\n\nclass Point {\n\n  /**\n   * Represents a coordinate pair.\n   * @param {number} [x=0] X.\n   * @param {number} [y=0] Y.\n   */\n  constructor(x, y) {\n    this.x = getNumber(x);\n    this.y = getNumber(y);\n  }\n\n  /**\n   * Whether two points are equal.\n   * @param {Point} a Point A.\n   * @param {Point} b Point B.\n   * @return {boolean}\n   */\n  static equals(a, b) {\n    return a.x === b.x && a.y === b.y;\n  }\n}\n\nexport default Point;\n","export default {\n  BASE: 'shuffle',\n  SHUFFLE_ITEM: 'shuffle-item',\n  VISIBLE: 'shuffle-item--visible',\n  HIDDEN: 'shuffle-item--hidden',\n};\n","import Point from './point';\nimport Classes from './classes';\n\nlet id = 0;\n\nclass ShuffleItem {\n  constructor(element) {\n    id += 1;\n    this.id = id;\n    this.element = element;\n    this.isVisible = true;\n  }\n\n  show() {\n    this.isVisible = true;\n    this.element.classList.remove(Classes.HIDDEN);\n    this.element.classList.add(Classes.VISIBLE);\n  }\n\n  hide() {\n    this.isVisible = false;\n    this.element.classList.remove(Classes.VISIBLE);\n    this.element.classList.add(Classes.HIDDEN);\n  }\n\n  init() {\n    this.addClasses([Classes.SHUFFLE_ITEM, Classes.VISIBLE]);\n    this.applyCss(ShuffleItem.Css.INITIAL);\n    this.scale = ShuffleItem.Scale.VISIBLE;\n    this.point = new Point();\n  }\n\n  addClasses(classes) {\n    classes.forEach((className) => {\n      this.element.classList.add(className);\n    });\n  }\n\n  removeClasses(classes) {\n    classes.forEach((className) => {\n      this.element.classList.remove(className);\n    });\n  }\n\n  applyCss(obj) {\n    Object.keys(obj).forEach((key) => {\n      this.element.style[key] = obj[key];\n    });\n  }\n\n  dispose() {\n    this.removeClasses([\n      Classes.HIDDEN,\n      Classes.VISIBLE,\n      Classes.SHUFFLE_ITEM,\n    ]);\n\n    this.element.removeAttribute('style');\n    this.element = null;\n  }\n}\n\nShuffleItem.Css = {\n  INITIAL: {\n    position: 'absolute',\n    top: 0,\n    left: 0,\n    visibility: 'visible',\n    'will-change': 'transform',\n  },\n  VISIBLE: {\n    before: {\n      opacity: 1,\n      visibility: 'visible',\n    },\n    after: {},\n  },\n  HIDDEN: {\n    before: {\n      opacity: 0,\n    },\n    after: {\n      visibility: 'hidden',\n    },\n  },\n};\n\nShuffleItem.Scale = {\n  VISIBLE: 1,\n  HIDDEN: 0.001,\n};\n\nexport default ShuffleItem;\n","const element = document.body || document.documentElement;\nconst e = document.createElement('div');\ne.style.cssText = 'width:10px;padding:2px;box-sizing:border-box;';\nelement.appendChild(e);\n\nconst width = window.getComputedStyle(e, null).width;\nconst ret = width === '10px';\n\nelement.removeChild(e);\n\nexport default ret;\n","import getNumber from './get-number';\nimport COMPUTED_SIZE_INCLUDES_PADDING from './computed-size';\n\n/**\n * Retrieve the computed style for an element, parsed as a float.\n * @param {Element} element Element to get style for.\n * @param {string} style Style property.\n * @param {CSSStyleDeclaration} [styles] Optionally include clean styles to\n *     use instead of asking for them again.\n * @return {number} The parsed computed value or zero if that fails because IE\n *     will return 'auto' when the element doesn't have margins instead of\n *     the computed style.\n */\nexport default function getNumberStyle(element, style,\n  styles = window.getComputedStyle(element, null)) {\n  let value = getNumber(styles[style]);\n\n  // Support IE<=11 and W3C spec.\n  if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'width') {\n    value += getNumber(styles.paddingLeft) +\n      getNumber(styles.paddingRight) +\n      getNumber(styles.borderLeftWidth) +\n      getNumber(styles.borderRightWidth);\n  } else if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'height') {\n    value += getNumber(styles.paddingTop) +\n      getNumber(styles.paddingBottom) +\n      getNumber(styles.borderTopWidth) +\n      getNumber(styles.borderBottomWidth);\n  }\n\n  return value;\n}\n","import xtend from 'xtend';\n\n/**\n * Fisher-Yates shuffle.\n * http://stackoverflow.com/a/962890/373422\n * https://bost.ocks.org/mike/shuffle/\n * @param {Array} array Array to shuffle.\n * @return {Array} Randomly sorted array.\n */\nfunction randomize(array) {\n  let n = array.length;\n\n  while (n) {\n    n -= 1;\n    const i = Math.floor(Math.random() * (n + 1));\n    const temp = array[i];\n    array[i] = array[n];\n    array[n] = temp;\n  }\n\n  return array;\n}\n\nconst defaults = {\n  // Use array.reverse() to reverse the results\n  reverse: false,\n\n  // Sorting function\n  by: null,\n\n  // If true, this will skip the sorting and return a randomized order in the array\n  randomize: false,\n\n  // Determines which property of each item in the array is passed to the\n  // sorting method.\n  key: 'element',\n};\n\n// You can return `undefined` from the `by` function to revert to DOM order.\nexport default function sorter(arr, options) {\n  const opts = xtend(defaults, options);\n  const original = [].slice.call(arr);\n  let revert = false;\n\n  if (!arr.length) {\n    return [];\n  }\n\n  if (opts.randomize) {\n    return randomize(arr);\n  }\n\n  // Sort the elements by the opts.by function.\n  // If we don't have opts.by, default to DOM order\n  if (typeof opts.by === 'function') {\n    arr.sort((a, b) => {\n      // Exit early if we already know we want to revert\n      if (revert) {\n        return 0;\n      }\n\n      const valA = opts.by(a[opts.key]);\n      const valB = opts.by(b[opts.key]);\n\n      // If both values are undefined, use the DOM order\n      if (valA === undefined && valB === undefined) {\n        revert = true;\n        return 0;\n      }\n\n      if (valA < valB || valA === 'sortFirst' || valB === 'sortLast') {\n        return -1;\n      }\n\n      if (valA > valB || valA === 'sortLast' || valB === 'sortFirst') {\n        return 1;\n      }\n\n      return 0;\n    });\n  }\n\n  // Revert to the original array if necessary\n  if (revert) {\n    return original;\n  }\n\n  if (opts.reverse) {\n    arr.reverse();\n  }\n\n  return arr;\n}\n","const transitions = {};\nconst eventName = 'transitionend';\nlet count = 0;\n\nfunction uniqueId() {\n  count += 1;\n  return eventName + count;\n}\n\nexport function cancelTransitionEnd(id) {\n  if (transitions[id]) {\n    transitions[id].element.removeEventListener(eventName, transitions[id].listener);\n    transitions[id] = null;\n    return true;\n  }\n\n  return false;\n}\n\nexport function onTransitionEnd(element, callback) {\n  const id = uniqueId();\n  const listener = (evt) => {\n    if (evt.currentTarget === evt.target) {\n      cancelTransitionEnd(id);\n      callback(evt);\n    }\n  };\n\n  element.addEventListener(eventName, listener);\n\n  transitions[id] = { element, listener };\n\n  return id;\n}\n","export default function arrayMax(array) {\n  return Math.max.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","export default function arrayMin(array) {\n  return Math.min.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","import Point from './point';\nimport arrayMax from './array-max';\nimport arrayMin from './array-min';\n\n/**\n * Determine the number of columns an items spans.\n * @param {number} itemWidth Width of the item.\n * @param {number} columnWidth Width of the column (includes gutter).\n * @param {number} columns Total number of columns\n * @param {number} threshold A buffer value for the size of the column to fit.\n * @return {number}\n */\nexport function getColumnSpan(itemWidth, columnWidth, columns, threshold) {\n  let columnSpan = itemWidth / columnWidth;\n\n  // If the difference between the rounded column span number and the\n  // calculated column span number is really small, round the number to\n  // make it fit.\n  if (Math.abs(Math.round(columnSpan) - columnSpan) < threshold) {\n    // e.g. columnSpan = 4.0089945390298745\n    columnSpan = Math.round(columnSpan);\n  }\n\n  // Ensure the column span is not more than the amount of columns in the whole layout.\n  return Math.min(Math.ceil(columnSpan), columns);\n}\n\n/**\n * Retrieves the column set to use for placement.\n * @param {number} columnSpan The number of columns this current item spans.\n * @param {number} columns The total columns in the grid.\n * @return {Array.<number>} An array of numbers represeting the column set.\n */\nexport function getAvailablePositions(positions, columnSpan, columns) {\n  // The item spans only one column.\n  if (columnSpan === 1) {\n    return positions;\n  }\n\n  // The item spans more than one column, figure out how many different\n  // places it could fit horizontally.\n  // The group count is the number of places within the positions this block\n  // could fit, ignoring the current positions of items.\n  // Imagine a 2 column brick as the second item in a 4 column grid with\n  // 10px height each. Find the places it would fit:\n  // [20, 10, 10, 0]\n  //  |   |   |\n  //  *   *   *\n  //\n  // Then take the places which fit and get the bigger of the two:\n  // max([20, 10]), max([10, 10]), max([10, 0]) = [20, 10, 0]\n  //\n  // Next, find the first smallest number (the short column).\n  // [20, 10, 0]\n  //          |\n  //          *\n  //\n  // And that's where it should be placed!\n  //\n  // Another example where the second column's item extends past the first:\n  // [10, 20, 10, 0] => [20, 20, 10] => 10\n  const available = [];\n\n  // For how many possible positions for this item there are.\n  for (let i = 0; i <= columns - columnSpan; i++) {\n    // Find the bigger value for each place it could fit.\n    available.push(arrayMax(positions.slice(i, i + columnSpan)));\n  }\n\n  return available;\n}\n\n/**\n * Find index of short column, the first from the left where this item will go.\n *\n * @param {Array.<number>} positions The array to search for the smallest number.\n * @param {number} buffer Optional buffer which is very useful when the height\n *     is a percentage of the width.\n * @return {number} Index of the short column.\n */\nexport function getShortColumn(positions, buffer) {\n  const minPosition = arrayMin(positions);\n  for (let i = 0, len = positions.length; i < len; i++) {\n    if (positions[i] >= minPosition - buffer && positions[i] <= minPosition + buffer) {\n      return i;\n    }\n  }\n\n  return 0;\n}\n\n/**\n * Determine the location of the next item, based on its size.\n * @param {Object} itemSize Object with width and height.\n * @param {Array.<number>} positions Positions of the other current items.\n * @param {number} gridSize The column width or row height.\n * @param {number} total The total number of columns or rows.\n * @param {number} threshold Buffer value for the column to fit.\n * @param {number} buffer Vertical buffer for the height of items.\n * @return {Point}\n */\nexport function getItemPosition({ itemSize, positions, gridSize, total, threshold, buffer }) {\n  const span = getColumnSpan(itemSize.width, gridSize, total, threshold);\n  const setY = getAvailablePositions(positions, span, total);\n  const shortColumnIndex = getShortColumn(setY, buffer);\n\n  // Position the item\n  const point = new Point(\n    Math.round(gridSize * shortColumnIndex),\n    Math.round(setY[shortColumnIndex]));\n\n  // Update the columns array with the new values for each column.\n  // e.g. before the update the columns could be [250, 0, 0, 0] for an item\n  // which spans 2 columns. After it would be [250, itemHeight, itemHeight, 0].\n  const setHeight = setY[shortColumnIndex] + itemSize.height;\n  for (let i = 0; i < span; i++) {\n    positions[shortColumnIndex + i] = setHeight;\n  }\n\n  return point;\n}\n","import 'custom-event-polyfill';\nimport matches from 'matches-selector';\nimport arrayUnique from 'array-uniq';\nimport xtend from 'xtend';\nimport throttle from 'throttleit';\nimport parallel from 'array-parallel';\nimport Point from './point';\nimport ShuffleItem from './shuffle-item';\nimport Classes from './classes';\nimport getNumberStyle from './get-number-style';\nimport sorter from './sorter';\nimport { onTransitionEnd, cancelTransitionEnd } from './on-transition-end';\nimport { getItemPosition, getColumnSpan, getAvailablePositions, getShortColumn } from './layout';\nimport arrayMax from './array-max';\n\nfunction toArray(arrayLike) {\n  return Array.prototype.slice.call(arrayLike);\n}\n\nfunction arrayIncludes(array, obj) {\n  return array.indexOf(obj) > -1;\n}\n\n// Used for unique instance variables\nlet id = 0;\n\nclass Shuffle {\n\n  /**\n   * Categorize, sort, and filter a responsive grid of items.\n   *\n   * @param {Element} element An element which is the parent container for the grid items.\n   * @param {Object} [options=Shuffle.options] Options object.\n   * @constructor\n   */\n  constructor(element, options = {}) {\n    this.options = xtend(Shuffle.options, options);\n\n    this.useSizer = false;\n    this.lastSort = {};\n    this.group = Shuffle.ALL_ITEMS;\n    this.lastFilter = Shuffle.ALL_ITEMS;\n    this.isEnabled = true;\n    this.isDestroyed = false;\n    this.isInitialized = false;\n    this._transitions = [];\n    this.isTransitioning = false;\n    this._queue = [];\n\n    const el = this._getElementOption(element);\n\n    if (!el) {\n      throw new TypeError('Shuffle needs to be initialized with an element.');\n    }\n\n    this.element = el;\n    this.id = 'shuffle_' + id;\n    id += 1;\n\n    this._init();\n    this.isInitialized = true;\n  }\n\n  _init() {\n    this.items = this._getItems();\n\n    this.options.sizer = this._getElementOption(this.options.sizer);\n\n    if (this.options.sizer) {\n      this.useSizer = true;\n    }\n\n    // Add class and invalidate styles\n    this.element.classList.add(Shuffle.Classes.BASE);\n\n    // Set initial css for each item\n    this._initItems();\n\n    // Bind resize events\n    this._onResize = this._getResizeFunction();\n    window.addEventListener('resize', this._onResize);\n\n    // Get container css all in one request. Causes reflow\n    const containerCss = window.getComputedStyle(this.element, null);\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // Add styles to the container if it doesn't have them.\n    this._validateStyles(containerCss);\n\n    // We already got the container's width above, no need to cause another\n    // reflow getting it again... Calculate the number of columns there will be\n    this._setColumns(containerWidth);\n\n    // Kick off!\n    this.filter(this.options.group, this.options.initialSort);\n\n    // The shuffle items haven't had transitions set on them yet so the user\n    // doesn't see the first layout. Set them now that the first layout is done.\n    // First, however, a synchronous layout must be caused for the previous\n    // styles to be applied without transitions.\n    this.element.offsetWidth; // eslint-disable-line no-unused-expressions\n    this._setTransitions();\n    this.element.style.transition = 'height ' + this.options.speed + 'ms ' + this.options.easing;\n  }\n\n  /**\n   * Returns a throttled and proxied function for the resize handler.\n   * @return {Function}\n   * @private\n   */\n  _getResizeFunction() {\n    const resizeFunction = this._handleResize.bind(this);\n    return this.options.throttle ?\n        this.options.throttle(resizeFunction, this.options.throttleTime) :\n        resizeFunction;\n  }\n\n  /**\n   * Retrieve an element from an option.\n   * @param {string|jQuery|Element} option The option to check.\n   * @return {?Element} The plain element or null.\n   * @private\n   */\n  _getElementOption(option) {\n    // If column width is a string, treat is as a selector and search for the\n    // sizer element within the outermost container\n    if (typeof option === 'string') {\n      return this.element.querySelector(option);\n\n    // Check for an element\n    } else if (option && option.nodeType && option.nodeType === 1) {\n      return option;\n\n    // Check for jQuery object\n    } else if (option && option.jquery) {\n      return option[0];\n    }\n\n    return null;\n  }\n\n  /**\n   * Ensures the shuffle container has the css styles it needs applied to it.\n   * @param {Object} styles Key value pairs for position and overflow.\n   * @private\n   */\n  _validateStyles(styles) {\n    // Position cannot be static.\n    if (styles.position === 'static') {\n      this.element.style.position = 'relative';\n    }\n\n    // Overflow has to be hidden.\n    if (styles.overflow !== 'hidden') {\n      this.element.style.overflow = 'hidden';\n    }\n  }\n\n  /**\n   * Filter the elements by a category.\n   * @param {string} [category] Category to filter by. If it's given, the last\n   *     category will be used to filter the items.\n   * @param {Array} [collection] Optionally filter a collection. Defaults to\n   *     all the items.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _filter(category = this.lastFilter, collection = this.items) {\n    const set = this._getFilteredSets(category, collection);\n\n    // Individually add/remove hidden/visible classes\n    this._toggleFilterClasses(set);\n\n    // Save the last filter in case elements are appended.\n    this.lastFilter = category;\n\n    // This is saved mainly because providing a filter function (like searching)\n    // will overwrite the `lastFilter` property every time its called.\n    if (typeof category === 'string') {\n      this.group = category;\n    }\n\n    return set;\n  }\n\n  /**\n   * Returns an object containing the visible and hidden elements.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Array.<Element>} items A collection of items to filter.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _getFilteredSets(category, items) {\n    let visible = [];\n    const hidden = [];\n\n    // category === 'all', add visible class to everything\n    if (category === Shuffle.ALL_ITEMS) {\n      visible = items;\n\n    // Loop through each item and use provided function to determine\n    // whether to hide it or not.\n    } else {\n      items.forEach((item) => {\n        if (this._doesPassFilter(category, item.element)) {\n          visible.push(item);\n        } else {\n          hidden.push(item);\n        }\n      });\n    }\n\n    return {\n      visible,\n      hidden,\n    };\n  }\n\n  /**\n   * Test an item to see if it passes a category.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Element} element An element to test.\n   * @return {boolean} Whether it passes the category/filter.\n   * @private\n   */\n  _doesPassFilter(category, element) {\n    if (typeof category === 'function') {\n      return category.call(element, element, this);\n    }\n\n    // Check each element's data-groups attribute against the given category.\n    const attr = element.getAttribute('data-' + Shuffle.FILTER_ATTRIBUTE_KEY);\n    const keys = this.options.delimeter ?\n          attr.split(this.options.delimeter) :\n          JSON.parse(attr);\n\n    function testCategory(category) {\n      return arrayIncludes(keys, category);\n    }\n\n    if (Array.isArray(category)) {\n      if (this.options.filterMode === Shuffle.FilterMode.ANY) {\n        return category.some(testCategory);\n      }\n      return category.every(testCategory);\n    }\n\n    return arrayIncludes(keys, category);\n  }\n\n  /**\n   * Toggles the visible and hidden class names.\n   * @param {{visible, hidden}} Object with visible and hidden arrays.\n   * @private\n   */\n  _toggleFilterClasses({ visible, hidden }) {\n    visible.forEach((item) => {\n      item.show();\n    });\n\n    hidden.forEach((item) => {\n      item.hide();\n    });\n  }\n\n  /**\n   * Set the initial css for each item\n   * @param {Array.<ShuffleItem>} [items] Optionally specifiy at set to initialize.\n   * @private\n   */\n  _initItems(items = this.items) {\n    items.forEach((item) => {\n      item.init();\n    });\n  }\n\n  /**\n   * Remove element reference and styles.\n   * @private\n   */\n  _disposeItems(items = this.items) {\n    items.forEach((item) => {\n      item.dispose();\n    });\n  }\n\n  /**\n   * Updates the visible item count.\n   * @private\n   */\n  _updateItemCount() {\n    this.visibleItems = this._getFilteredItems().length;\n  }\n\n  /**\n   * Sets css transform transition on a group of elements. This is not executed\n   * at the same time as `item.init` so that transitions don't occur upon\n   * initialization of Shuffle.\n   * @param {Array.<ShuffleItem>} items Shuffle items to set transitions on.\n   * @private\n   */\n  _setTransitions(items = this.items) {\n    const speed = this.options.speed;\n    const easing = this.options.easing;\n\n    const str = this.options.useTransforms ?\n      `transform ${speed}ms ${easing}, opacity ${speed}ms ${easing}` :\n      `top ${speed}ms ${easing}, left ${speed}ms ${easing}, opacity ${speed}ms ${easing}`;\n\n    items.forEach((item) => {\n      item.element.style.transition = str;\n    });\n  }\n\n  _getItems() {\n    return toArray(this.element.children)\n      .filter(el => matches(el, this.options.itemSelector))\n      .map(el => new ShuffleItem(el));\n  }\n\n  /**\n   * When new elements are added to the shuffle container, update the array of\n   * items because that is the order `_layout` calls them.\n   */\n  _updateItemsOrder() {\n    const children = this.element.children;\n    this.items = sorter(this.items, {\n      by(element) {\n        return Array.prototype.indexOf.call(children, element);\n      },\n    });\n  }\n\n  _getFilteredItems() {\n    return this.items.filter(item => item.isVisible);\n  }\n\n  _getConcealedItems() {\n    return this.items.filter(item => !item.isVisible);\n  }\n\n  /**\n   * Returns the column size, based on column width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @param {number} gutterSize Size of the gutters.\n   * @return {number}\n   * @private\n   */\n  _getColumnSize(containerWidth, gutterSize) {\n    let size;\n\n    // If the columnWidth property is a function, then the grid is fluid\n    if (typeof this.options.columnWidth === 'function') {\n      size = this.options.columnWidth(containerWidth);\n\n    // columnWidth option isn't a function, are they using a sizing element?\n    } else if (this.useSizer) {\n      size = Shuffle.getSize(this.options.sizer).width;\n\n    // if not, how about the explicitly set option?\n    } else if (this.options.columnWidth) {\n      size = this.options.columnWidth;\n\n    // or use the size of the first item\n    } else if (this.items.length > 0) {\n      size = Shuffle.getSize(this.items[0].element, true).width;\n\n    // if there's no items, use size of container\n    } else {\n      size = containerWidth;\n    }\n\n    // Don't let them set a column width of zero.\n    if (size === 0) {\n      size = containerWidth;\n    }\n\n    return size + gutterSize;\n  }\n\n  /**\n   * Returns the gutter size, based on gutter width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @return {number}\n   * @private\n   */\n  _getGutterSize(containerWidth) {\n    let size;\n    if (typeof this.options.gutterWidth === 'function') {\n      size = this.options.gutterWidth(containerWidth);\n    } else if (this.useSizer) {\n      size = getNumberStyle(this.options.sizer, 'marginLeft');\n    } else {\n      size = this.options.gutterWidth;\n    }\n\n    return size;\n  }\n\n  /**\n   * Calculate the number of columns to be used. Gets css if using sizer element.\n   * @param {number} [containerWidth] Optionally specify a container width if\n   *    it's already available.\n   */\n  _setColumns(containerWidth = Shuffle.getSize(this.element).width) {\n    const gutter = this._getGutterSize(containerWidth);\n    const columnWidth = this._getColumnSize(containerWidth, gutter);\n    let calculatedColumns = (containerWidth + gutter) / columnWidth;\n\n    // Widths given from getStyles are not precise enough...\n    if (Math.abs(Math.round(calculatedColumns) - calculatedColumns) <\n        this.options.columnThreshold) {\n      // e.g. calculatedColumns = 11.998876\n      calculatedColumns = Math.round(calculatedColumns);\n    }\n\n    this.cols = Math.max(Math.floor(calculatedColumns), 1);\n    this.containerWidth = containerWidth;\n    this.colWidth = columnWidth;\n  }\n\n  /**\n   * Adjust the height of the grid\n   */\n  _setContainerSize() {\n    this.element.style.height = this._getContainerSize() + 'px';\n  }\n\n  /**\n   * Based on the column heights, it returns the biggest one.\n   * @return {number}\n   * @private\n   */\n  _getContainerSize() {\n    return arrayMax(this.positions);\n  }\n\n  /**\n   * Get the clamped stagger amount.\n   * @param {number} index Index of the item to be staggered.\n   * @return {number}\n   */\n  _getStaggerAmount(index) {\n    return Math.min(index * this.options.staggerAmount, this.options.staggerAmountMax);\n  }\n\n  /**\n   * @return {boolean} Whether the event was prevented or not.\n   */\n  _dispatch(name, details = {}) {\n    if (this.isDestroyed) {\n      return false;\n    }\n\n    details.shuffle = this;\n    return !this.element.dispatchEvent(new CustomEvent(name, {\n      bubbles: true,\n      cancelable: false,\n      detail: details,\n    }));\n  }\n\n  /**\n   * Zeros out the y columns array, which is used to determine item placement.\n   * @private\n   */\n  _resetCols() {\n    let i = this.cols;\n    this.positions = [];\n    while (i) {\n      i -= 1;\n      this.positions.push(0);\n    }\n  }\n\n  /**\n   * Loops through each item that should be shown and calculates the x, y position.\n   * @param {Array.<ShuffleItem>} items Array of items that will be shown/layed\n   *     out in order in their array.\n   */\n  _layout(items) {\n    let count = 0;\n    items.forEach((item) => {\n      const currPos = item.point;\n      const currScale = item.scale;\n      const itemSize = Shuffle.getSize(item.element, true);\n      const pos = this._getItemPosition(itemSize);\n\n      function callback() {\n        item.element.style.transitionDelay = '';\n        item.applyCss(ShuffleItem.Css.VISIBLE.after);\n      }\n\n      // If the item will not change its position, do not add it to the render\n      // queue. Transitions don't fire when setting a property to the same value.\n      if (Point.equals(currPos, pos) && currScale === ShuffleItem.Scale.VISIBLE) {\n        item.applyCss(ShuffleItem.Css.VISIBLE.before);\n        callback();\n        return;\n      }\n\n      item.point = pos;\n      item.scale = ShuffleItem.Scale.VISIBLE;\n\n      // Use xtend here to clone the object so that the `before` object isn't\n      // modified when the transition delay is added.\n      const styles = xtend(ShuffleItem.Css.VISIBLE.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Determine the location of the next item, based on its size.\n   * @param {{width: number, height: number}} itemSize Object with width and height.\n   * @return {Point}\n   * @private\n   */\n  _getItemPosition(itemSize) {\n    return getItemPosition({\n      itemSize,\n      positions: this.positions,\n      gridSize: this.colWidth,\n      total: this.cols,\n      threshold: this.options.columnThreshold,\n      buffer: this.options.buffer,\n    });\n  }\n\n  /**\n   * Hides the elements that don't match our filter.\n   * @param {Array.<ShuffleItem>} collection Collection to shrink.\n   * @private\n   */\n  _shrink(collection = this._getConcealedItems()) {\n    let count = 0;\n    collection.forEach((item) => {\n      function callback() {\n        item.applyCss(ShuffleItem.Css.HIDDEN.after);\n      }\n\n      // Continuing would add a transitionend event listener to the element, but\n      // that listener would not execute because the transform and opacity would\n      // stay the same.\n      // The callback is executed here because it is not guaranteed to be called\n      // after the transitionend event because the transitionend could be\n      // canceled if another animation starts.\n      if (item.scale === ShuffleItem.Scale.HIDDEN) {\n        item.applyCss(ShuffleItem.Css.HIDDEN.before);\n        callback();\n        return;\n      }\n\n      item.scale = ShuffleItem.Scale.HIDDEN;\n\n      const styles = xtend(ShuffleItem.Css.HIDDEN.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Resize handler.\n   * @private\n   */\n  _handleResize() {\n    // If shuffle is disabled, destroyed, don't do anything\n    if (!this.isEnabled || this.isDestroyed) {\n      return;\n    }\n\n    // Will need to check height in the future if it's layed out horizontaly\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // containerWidth hasn't changed, don't do anything\n    if (containerWidth === this.containerWidth) {\n      return;\n    }\n\n    this.update();\n  }\n\n  /**\n   * Returns styles which will be applied to the an item for a transition.\n   * @param {Object} obj Transition options.\n   * @return {!Object} Transforms for transitions, left/top for animate.\n   * @private\n   */\n  _getStylesForTransition({ item, styles }) {\n    if (!styles.transitionDelay) {\n      styles.transitionDelay = '0ms';\n    }\n\n    const x = item.point.x;\n    const y = item.point.y;\n\n    if (this.options.useTransforms) {\n      styles.transform = `translate(${x}px, ${y}px) scale(${item.scale})`;\n    } else {\n      styles.left = x + 'px';\n      styles.top = y + 'px';\n    }\n\n    return styles;\n  }\n\n  /**\n   * Listen for the transition end on an element and execute the itemCallback\n   * when it finishes.\n   * @param {Element} element Element to listen on.\n   * @param {Function} itemCallback Callback for the item.\n   * @param {Function} done Callback to notify `parallel` that this one is done.\n   */\n  _whenTransitionDone(element, itemCallback, done) {\n    const id = onTransitionEnd(element, (evt) => {\n      itemCallback();\n      done(null, evt);\n    });\n\n    this._transitions.push(id);\n  }\n\n  /**\n   * Return a function which will set CSS styles and call the `done` function\n   * when (if) the transition finishes.\n   * @param {Object} opts Transition object.\n   * @return {Function} A function to be called with a `done` function.\n   */\n  _getTransitionFunction(opts) {\n    return (done) => {\n      opts.item.applyCss(this._getStylesForTransition(opts));\n      this._whenTransitionDone(opts.item.element, opts.callback, done);\n    };\n  }\n\n  /**\n   * Execute the styles gathered in the style queue. This applies styles to elements,\n   * triggering transitions.\n   * @private\n   */\n  _processQueue() {\n    if (this.isTransitioning) {\n      this._cancelMovement();\n    }\n\n    const hasSpeed = this.options.speed > 0;\n    const hasQueue = this._queue.length > 0;\n\n    if (hasQueue && hasSpeed && this.isInitialized) {\n      this._startTransitions(this._queue);\n    } else if (hasQueue) {\n      this._styleImmediately(this._queue);\n      this._dispatchLayout();\n\n    // A call to layout happened, but none of the newly visible items will\n    // change position or the transition duration is zero, which will not trigger\n    // the transitionend event.\n    } else {\n      this._dispatchLayout();\n    }\n\n    // Remove everything in the style queue\n    this._queue.length = 0;\n  }\n\n  /**\n   * Wait for each transition to finish, the emit the layout event.\n   * @param {Array.<Object>} transitions Array of transition objects.\n   */\n  _startTransitions(transitions) {\n    // Set flag that shuffle is currently in motion.\n    this.isTransitioning = true;\n\n    // Create an array of functions to be called.\n    const callbacks = transitions.map(obj => this._getTransitionFunction(obj));\n\n    parallel(callbacks, this._movementFinished.bind(this));\n  }\n\n  _cancelMovement() {\n    // Remove the transition end event for each listener.\n    this._transitions.forEach(cancelTransitionEnd);\n\n    // Reset the array.\n    this._transitions.length = 0;\n\n    // Show it's no longer active.\n    this.isTransitioning = false;\n  }\n\n  /**\n   * Apply styles without a transition.\n   * @param {Array.<Object>} objects Array of transition objects.\n   * @private\n   */\n  _styleImmediately(objects) {\n    if (objects.length) {\n      const elements = objects.map(obj => obj.item.element);\n\n      Shuffle._skipTransitions(elements, () => {\n        objects.forEach((obj) => {\n          obj.item.applyCss(this._getStylesForTransition(obj));\n          obj.callback();\n        });\n      });\n    }\n  }\n\n  _movementFinished() {\n    this._transitions.length = 0;\n    this.isTransitioning = false;\n    this._dispatchLayout();\n  }\n\n  _dispatchLayout() {\n    this._dispatch(Shuffle.EventType.LAYOUT);\n  }\n\n  /**\n   * The magic. This is what makes the plugin 'shuffle'\n   * @param {string|Function|Array.<string>} [category] Category to filter by.\n   *     Can be a function, string, or array of strings.\n   * @param {Object} [sortObj] A sort object which can sort the visible set\n   */\n  filter(category, sortObj) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    if (!category || (category && category.length === 0)) {\n      category = Shuffle.ALL_ITEMS; // eslint-disable-line no-param-reassign\n    }\n\n    this._filter(category);\n\n    // Shrink each hidden item\n    this._shrink();\n\n    // How many visible elements?\n    this._updateItemCount();\n\n    // Update transforms on visible elements so they will animate to their new positions.\n    this.sort(sortObj);\n  }\n\n  /**\n   * Gets the visible elements, sorts them, and passes them to layout.\n   * @param {Object} opts the options object for the sorted plugin\n   */\n  sort(opts = this.lastSort) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    this._resetCols();\n\n    let items = this._getFilteredItems();\n    items = sorter(items, opts);\n\n    this._layout(items);\n\n    // `_layout` always happens after `_shrink`, so it's safe to process the style\n    // queue here with styles from the shrink method.\n    this._processQueue();\n\n    // Adjust the height of the container.\n    this._setContainerSize();\n\n    this.lastSort = opts;\n  }\n\n  /**\n   * Reposition everything.\n   * @param {boolean} isOnlyLayout If true, column and gutter widths won't be\n   *     recalculated.\n   */\n  update(isOnlyLayout) {\n    if (this.isEnabled) {\n      if (!isOnlyLayout) {\n        // Get updated colCount\n        this._setColumns();\n      }\n\n      // Layout items\n      this.sort();\n    }\n  }\n\n  /**\n   * Use this instead of `update()` if you don't need the columns and gutters updated\n   * Maybe an image inside `shuffle` loaded (and now has a height), which means calculations\n   * could be off.\n   */\n  layout() {\n    this.update(true);\n  }\n\n  /**\n   * New items have been appended to shuffle. Mix them in with the current\n   * filter or sort status.\n   * @param {Array.<Element>} newItems Collection of new items.\n   */\n  add(newItems) {\n    const items = arrayUnique(newItems).map(el => new ShuffleItem(el));\n\n    // Add classes and set initial positions.\n    this._initItems(items);\n\n    // Add transition to each item.\n    this._setTransitions(items);\n\n    // Update the list of items.\n    this.items = this.items.concat(items);\n    this._updateItemsOrder();\n    this.filter(this.lastFilter);\n  }\n\n  /**\n   * Disables shuffle from updating dimensions and layout on resize\n   */\n  disable() {\n    this.isEnabled = false;\n  }\n\n  /**\n   * Enables shuffle again\n   * @param {boolean} [isUpdateLayout=true] if undefined, shuffle will update columns and gutters\n   */\n  enable(isUpdateLayout) {\n    this.isEnabled = true;\n    if (isUpdateLayout !== false) {\n      this.update();\n    }\n  }\n\n  /**\n   * Remove 1 or more shuffle items\n   * @param {Array.<Element>} elements An array containing one or more\n   *     elements in shuffle\n   * @return {Shuffle} The shuffle object\n   */\n  remove(elements) {\n    if (!elements.length) {\n      return;\n    }\n\n    const collection = arrayUnique(elements);\n\n    const oldItems = collection\n      .map(element => this.getItemByElement(element))\n      .filter(item => !!item);\n\n    const handleLayout = () => {\n      this.element.removeEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n      this._disposeItems(oldItems);\n\n      // Remove the collection in the callback\n      collection.forEach((element) => {\n        element.parentNode.removeChild(element);\n      });\n\n      this._dispatch(Shuffle.EventType.REMOVED, { collection });\n    };\n\n    // Hide collection first.\n    this._toggleFilterClasses({\n      visible: [],\n      hidden: oldItems,\n    });\n\n    this._shrink(oldItems);\n\n    this.sort();\n\n    // Update the list of items here because `remove` could be called again\n    // with an item that is in the process of being removed.\n    this.items = this.items.filter(item => !arrayIncludes(oldItems, item));\n    this._updateItemCount();\n\n    this.element.addEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n  }\n\n  /**\n   * Retrieve a shuffle item by its element.\n   * @param {Element} element Element to look for.\n   * @return {?ShuffleItem} A shuffle item or null if it's not found.\n   */\n  getItemByElement(element) {\n    for (let i = this.items.length - 1; i >= 0; i--) {\n      if (this.items[i].element === element) {\n        return this.items[i];\n      }\n    }\n\n    return null;\n  }\n\n  /**\n   * Destroys shuffle, removes events, styles, and classes\n   */\n  destroy() {\n    this._cancelMovement();\n    window.removeEventListener('resize', this._onResize);\n\n    // Reset container styles\n    this.element.classList.remove('shuffle');\n    this.element.removeAttribute('style');\n\n    // Reset individual item styles\n    this._disposeItems();\n\n    // Null DOM references\n    this.items = null;\n    this.options.sizer = null;\n    this.element = null;\n    this._transitions = null;\n\n    // Set a flag so if a debounced resize has been triggered,\n    // it can first check if it is actually isDestroyed and not doing anything\n    this.isDestroyed = true;\n  }\n\n  /**\n   * Returns the outer width of an element, optionally including its margins.\n   *\n   * There are a few different methods for getting the width of an element, none of\n   * which work perfectly for all Shuffle's use cases.\n   *\n   * 1. getBoundingClientRect() `left` and `right` properties.\n   *   - Accounts for transform scaled elements, making it useless for Shuffle\n   *   elements which have shrunk.\n   * 2. The `offsetWidth` property.\n   *   - This value stays the same regardless of the elements transform property,\n   *   however, it does not return subpixel values.\n   * 3. getComputedStyle()\n   *   - This works great Chrome, Firefox, Safari, but IE<=11 does not include\n   *   padding and border when box-sizing: border-box is set, requiring a feature\n   *   test and extra work to add the padding back for IE and other browsers which\n   *   follow the W3C spec here.\n   *\n   * @param {Element} element The element.\n   * @param {boolean} [includeMargins] Whether to include margins. 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diff --git a/dist/shuffle.min.js b/dist/shuffle.min.js
index 8ab6535..cddc62e 100644
--- a/dist/shuffle.min.js
+++ b/dist/shuffle.min.js
@@ -1,2 +1,2 @@
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t.item.element});t._skipTransitions(n,function(){e.forEach(function(t){t.item.applyCss(i._getStylesForTransition(t)),t.callback()})})}}},{key:"_movementFinished",value:function(){this._transitions.length=0,this.isTransitioning=!1,this._dispatchLayout()}},{key:"_dispatchLayout",value:function(){this._dispatch(t.EventType.LAYOUT)}},{key:"filter",value:function(e,i){this.isEnabled&&((!e||e&&0===e.length)&&(e=t.ALL_ITEMS),this._filter(e),this._shrink(),this._updateItemCount(),this.sort(i))}},{key:"sort",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.lastSort;if(this.isEnabled){this._resetCols();var e=this._getFilteredItems();e=l(e,t),this._layout(e),this._processQueue(),this._setContainerSize(),this.lastSort=t}}},{key:"update",value:function(t){this.isEnabled&&(t||this._setColumns(),this.sort())}},{key:"layout",value:function(){this.update(!0)}},{key:"add",value:function(t){var e=T(t).map(function(t){return new 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null}},{key:"destroy",value:function(){this._cancelMovement(),window.removeEventListener("resize",this._onResize),this.element.classList.remove("shuffle"),this.element.removeAttribute("style"),this._disposeItems(),this.items=null,this.options.sizer=null,this.element=null,this._transitions=null,this.isDestroyed=!0}}],[{key:"getSize",value:function(t,e){var i=window.getComputedStyle(t,null),n=o(t,"width",i),s=o(t,"height",i);if(e){var r=o(t,"marginLeft",i),l=o(t,"marginRight",i),a=o(t,"marginTop",i),u=o(t,"marginBottom",i);n+=r+l,s+=a+u}return{width:n,height:s}}},{key:"_skipTransitions",value:function(t,e){var i=t.map(function(t){var e=t.style,i=e.transitionDuration,n=e.transitionDelay;return e.transitionDuration="0ms",e.transitionDelay="0ms",{duration:i,delay:n}});e(),t[0].offsetWidth,t.forEach(function(t,e){t.style.transitionDuration=i[e].duration,t.style.transitionDelay=i[e].delay})}}]),t}();return 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t.x===e.x&&t.y===e.y}}]),t}(),F={BASE:"shuffle",SHUFFLE_ITEM:"shuffle-item",VISIBLE:"shuffle-item--visible",HIDDEN:"shuffle-item--hidden"},x=0,B=function(){function t(e){D(this,t),x+=1,this.id=x,this.element=e,this.isVisible=!0}return M(t,[{key:"show",value:function(){this.isVisible=!0,this.element.classList.remove(F.HIDDEN),this.element.classList.add(F.VISIBLE)}},{key:"hide",value:function(){this.isVisible=!1,this.element.classList.remove(F.VISIBLE),this.element.classList.add(F.HIDDEN)}},{key:"init",value:function(){this.addClasses([F.SHUFFLE_ITEM,F.VISIBLE]),this.applyCss(t.Css.INITIAL),this.scale=t.Scale.VISIBLE,this.point=new A}},{key:"addClasses",value:function(t){var e=this;t.forEach(function(t){e.element.classList.add(t)})}},{key:"removeClasses",value:function(t){var e=this;t.forEach(function(t){e.element.classList.remove(t)})}},{key:"applyCss",value:function(t){var e=this;Object.keys(t).forEach(function(i){e.element.style[i]=t[i]})}},{key:"dispose",value:function(){this.removeClasses([F.HIDDEN,F.VISIBLE,F.SHUFFLE_ITEM]),this.element.removeAttribute("style"),this.element=null}}]),t}();B.Css={INITIAL:{position:"absolute",top:0,left:0,visibility:"visible","will-change":"transform"},VISIBLE:{before:{opacity:1,visibility:"visible"},after:{}},HIDDEN:{before:{opacity:0},after:{visibility:"hidden"}}},B.Scale={VISIBLE:1,HIDDEN:.001};var O=document.body||document.documentElement,V=document.createElement("div");V.style.cssText="width:10px;padding:2px;box-sizing:border-box;",O.appendChild(V);var N=window.getComputedStyle(V,null).width,W="10px"===N;O.removeChild(V);var R={reverse:!1,by:null,randomize:!1,key:"element"},H={},q="transitionend",P=0,U=0,Y=function(){function t(e){var i=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};D(this,t),this.options=w(t.options,i),this.useSizer=!1,this.lastSort={},this.group=t.ALL_ITEMS,this.lastFilter=t.ALL_ITEMS,this.isEnabled=!0,this.isDestroyed=!1,this.isInitialized=!1,this._transitions=[],this.isTransitioning=!1,this._queue=[];var n=this._getElementOption(e);if(!n)throw new TypeError("Shuffle needs to be initialized with an element.");this.element=n,this.id="shuffle_"+U,U+=1,this._init(),this.isInitialized=!0}return M(t,[{key:"_init",value:function(){this.items=this._getItems(),this.options.sizer=this._getElementOption(this.options.sizer),this.options.sizer&&(this.useSizer=!0),this.element.classList.add(t.Classes.BASE),this._initItems(),this._onResize=this._getResizeFunction(),window.addEventListener("resize",this._onResize);var e=window.getComputedStyle(this.element,null),i=t.getSize(this.element).width;this._validateStyles(e),this._setColumns(i),this.filter(this.options.group,this.options.initialSort),this.element.offsetWidth,this._setTransitions(),this.element.style.transition="height "+this.options.speed+"ms "+this.options.easing}},{key:"_getResizeFunction",value:function(){var t=this._handleResize.bind(this);return this.options.throttle?this.options.throttle(t,this.options.throttleTime):t}},{key:"_getElementOption",value:function(t){return"string"==typeof t?this.element.querySelector(t):t&&t.nodeType&&1===t.nodeType?t:t&&t.jquery?t[0]:null}},{key:"_validateStyles",value:function(t){"static"===t.position&&(this.element.style.position="relative"),"hidden"!==t.overflow&&(this.element.style.overflow="hidden")}},{key:"_filter",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.lastFilter,e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.items,i=this._getFilteredSets(t,e);return this._toggleFilterClasses(i),this.lastFilter=t,"string"==typeof t&&(this.group=t),i}},{key:"_getFilteredSets",value:function(e,i){var n=this,s=[],o=[];return e===t.ALL_ITEMS?s=i:i.forEach(function(t){n._doesPassFilter(e,t.element)?s.push(t):o.push(t)}),{visible:s,hidden:o}}},{key:"_doesPassFilter",value:function(e,i){function n(t){return g(o,t)}if("function"==typeof e)return e.call(i,i,this);var s=i.getAttribute("data-"+t.FILTER_ATTRIBUTE_KEY),o=this.options.delimeter?s.split(this.options.delimeter):JSON.parse(s);return Array.isArray(e)?this.options.filterMode===t.FilterMode.ANY?e.some(n):e.every(n):g(o,e)}},{key:"_toggleFilterClasses",value:function(t){var e=t.visible,i=t.hidden;e.forEach(function(t){t.show()}),i.forEach(function(t){t.hide()})}},{key:"_initItems",value:function(){(arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.items).forEach(function(t){t.init()})}},{key:"_disposeItems",value:function(){(arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.items).forEach(function(t){t.dispose()})}},{key:"_updateItemCount",value:function(){this.visibleItems=this._getFilteredItems().length}},{key:"_setTransitions",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.items,e=this.options.speed,i=this.options.easing,n=this.options.useTransforms?"transform "+e+"ms "+i+", opacity "+e+"ms "+i:"top "+e+"ms "+i+", left "+e+"ms "+i+", opacity "+e+"ms "+i;t.forEach(function(t){t.element.style.transition=n})}},{key:"_getItems",value:function(){var t=this;return y(this.element.children).filter(function(e){return I(e,t.options.itemSelector)}).map(function(t){return new B(t)})}},{key:"_updateItemsOrder",value:function(){var t=this.element.children;this.items=l(this.items,{by:function(e){return Array.prototype.indexOf.call(t,e)}})}},{key:"_getFilteredItems",value:function(){return this.items.filter(function(t){return t.isVisible})}},{key:"_getConcealedItems",value:function(){return this.items.filter(function(t){return!t.isVisible})}},{key:"_getColumnSize",value:function(e,i){var n=void 0;return n="function"==typeof this.options.columnWidth?this.options.columnWidth(e):this.useSizer?t.getSize(this.options.sizer).width:this.options.columnWidth?this.options.columnWidth:this.items.length>0?t.getSize(this.items[0].element,!0).width:e,0===n&&(n=e),n+i}},{key:"_getGutterSize",value:function(t){return"function"==typeof this.options.gutterWidth?this.options.gutterWidth(t):this.useSizer?o(this.options.sizer,"marginLeft"):this.options.gutterWidth}},{key:"_setColumns",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:t.getSize(this.element).width,i=this._getGutterSize(e),n=this._getColumnSize(e,i),s=(e+i)/n;Math.abs(Math.round(s)-s)<this.options.columnThreshold&&(s=Math.round(s)),this.cols=Math.max(Math.floor(s),1),this.containerWidth=e,this.colWidth=n}},{key:"_setContainerSize",value:function(){this.element.style.height=this._getContainerSize()+"px"}},{key:"_getContainerSize",value:function(){return f(this.positions)}},{key:"_getStaggerAmount",value:function(t){return Math.min(t*this.options.staggerAmount,this.options.staggerAmountMax)}},{key:"_dispatch",value:function(t){var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};return!this.isDestroyed&&(e.shuffle=this,!this.element.dispatchEvent(new CustomEvent(t,{bubbles:!0,cancelable:!1,detail:e})))}},{key:"_resetCols",value:function(){var t=this.cols;for(this.positions=[];t;)t-=1,this.positions.push(0)}},{key:"_layout",value:function(e){var i=this,n=0;e.forEach(function(e){function s(){e.element.style.transitionDelay="",e.applyCss(B.Css.VISIBLE.after)}var o=e.point,r=e.scale,l=t.getSize(e.element,!0),a=i._getItemPosition(l);if(A.equals(o,a)&&r===B.Scale.VISIBLE)return e.applyCss(B.Css.VISIBLE.before),void s();e.point=a,e.scale=B.Scale.VISIBLE;var u=w(B.Css.VISIBLE.before);u.transitionDelay=i._getStaggerAmount(n)+"ms",i._queue.push({item:e,styles:u,callback:s}),n+=1})}},{key:"_getItemPosition",value:function(t){return p({itemSize:t,positions:this.positions,gridSize:this.colWidth,total:this.cols,threshold:this.options.columnThreshold,buffer:this.options.buffer})}},{key:"_shrink",value:function(){var t=this,e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this._getConcealedItems(),i=0;e.forEach(function(e){function n(){e.applyCss(B.Css.HIDDEN.after)}if(e.scale===B.Scale.HIDDEN)return e.applyCss(B.Css.HIDDEN.before),void n();e.scale=B.Scale.HIDDEN;var s=w(B.Css.HIDDEN.before);s.transitionDelay=t._getStaggerAmount(i)+"ms",t._queue.push({item:e,styles:s,callback:n}),i+=1})}},{key:"_handleResize",value:function(){if(this.isEnabled&&!this.isDestroyed){t.getSize(this.element).width!==this.containerWidth&&this.update()}}},{key:"_getStylesForTransition",value:function(t){var e=t.item,i=t.styles;i.transitionDelay||(i.transitionDelay="0ms");var n=e.point.x,s=e.point.y;return this.options.useTransforms?i.transform="translate("+n+"px, "+s+"px) scale("+e.scale+")":(i.left=n+"px",i.top=s+"px"),i}},{key:"_whenTransitionDone",value:function(t,e,i){var n=h(t,function(t){e(),i(null,t)});this._transitions.push(n)}},{key:"_getTransitionFunction",value:function(t){var e=this;return function(i){t.item.applyCss(e._getStylesForTransition(t)),e._whenTransitionDone(t.item.element,t.callback,i)}}},{key:"_processQueue",value:function(){this.isTransitioning&&this._cancelMovement();var t=this.options.speed>0,e=this._queue.length>0;e&&t&&this.isInitialized?this._startTransitions(this._queue):e?(this._styleImmediately(this._queue),this._dispatchLayout()):this._dispatchLayout(),this._queue.length=0}},{key:"_startTransitions",value:function(t){var e=this;this.isTransitioning=!0;var i=t.map(function(t){return e._getTransitionFunction(t)});z(i,this._movementFinished.bind(this))}},{key:"_cancelMovement",value:function(){this._transitions.forEach(u),this._transitions.length=0,this.isTransitioning=!1}},{key:"_styleImmediately",value:function(e){var i=this;if(e.length){var n=e.map(function(t){return t.item.element});t._skipTransitions(n,function(){e.forEach(function(t){t.item.applyCss(i._getStylesForTransition(t)),t.callback()})})}}},{key:"_movementFinished",value:function(){this._transitions.length=0,this.isTransitioning=!1,this._dispatchLayout()}},{key:"_dispatchLayout",value:function(){this._dispatch(t.EventType.LAYOUT)}},{key:"filter",value:function(e,i){this.isEnabled&&((!e||e&&0===e.length)&&(e=t.ALL_ITEMS),this._filter(e),this._shrink(),this._updateItemCount(),this.sort(i))}},{key:"sort",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.lastSort;if(this.isEnabled){this._resetCols();var e=this._getFilteredItems();e=l(e,t),this._layout(e),this._processQueue(),this._setContainerSize(),this.lastSort=t}}},{key:"update",value:function(t){this.isEnabled&&(t||this._setColumns(),this.sort())}},{key:"layout",value:function(){this.update(!0)}},{key:"add",value:function(t){var e=T(t).map(function(t){return new B(t)});this._initItems(e),this._setTransitions(e),this.items=this.items.concat(e),this._updateItemsOrder(),this.filter(this.lastFilter)}},{key:"disable",value:function(){this.isEnabled=!1}},{key:"enable",value:function(t){this.isEnabled=!0,!1!==t&&this.update()}},{key:"remove",value:function(e){var i=this;if(e.length){var n=T(e),s=n.map(function(t){return i.getItemByElement(t)}).filter(function(t){return!!t}),o=function e(){i.element.removeEventListener(t.EventType.LAYOUT,e),i._disposeItems(s),n.forEach(function(t){t.parentNode.removeChild(t)}),i._dispatch(t.EventType.REMOVED,{collection:n})};this._toggleFilterClasses({visible:[],hidden:s}),this._shrink(s),this.sort(),this.items=this.items.filter(function(t){return!g(s,t)}),this._updateItemCount(),this.element.addEventListener(t.EventType.LAYOUT,o)}}},{key:"getItemByElement",value:function(t){for(var e=this.items.length-1;e>=0;e--)if(this.items[e].element===t)return this.items[e];return null}},{key:"destroy",value:function(){this._cancelMovement(),window.removeEventListener("resize",this._onResize),this.element.classList.remove("shuffle"),this.element.removeAttribute("style"),this._disposeItems(),this.items=null,this.options.sizer=null,this.element=null,this._transitions=null,this.isDestroyed=!0}}],[{key:"getSize",value:function(t,e){var i=window.getComputedStyle(t,null),n=o(t,"width",i),s=o(t,"height",i);if(e){var r=o(t,"marginLeft",i),l=o(t,"marginRight",i),a=o(t,"marginTop",i),u=o(t,"marginBottom",i);n+=r+l,s+=a+u}return{width:n,height:s}}},{key:"_skipTransitions",value:function(t,e){var i=t.map(function(t){var e=t.style,i=e.transitionDuration,n=e.transitionDelay;return e.transitionDuration="0ms",e.transitionDelay="0ms",{duration:i,delay:n}});e(),t[0].offsetWidth,t.forEach(function(t,e){t.style.transitionDuration=i[e].duration,t.style.transitionDelay=i[e].delay})}}]),t}();return Y.ShuffleItem=B,Y.ALL_ITEMS="all",Y.FILTER_ATTRIBUTE_KEY="groups",Y.EventType={LAYOUT:"shuffle:layout",REMOVED:"shuffle:removed"},Y.Classes=F,Y.FilterMode={ANY:"any",ALL:"all"},Y.options={group:Y.ALL_ITEMS,speed:250,easing:"ease",itemSelector:"*",sizer:null,gutterWidth:0,columnWidth:0,delimeter:null,buffer:0,columnThreshold:.01,initialSort:null,throttle:C,throttleTime:300,staggerAmount:15,staggerAmountMax:250,useTransforms:!0,filterMode:Y.FilterMode.ANY},Y.__Point=A,Y.__sorter=l,Y.__getColumnSpan=d,Y.__getAvailablePositions=m,Y.__getShortColumn=v,Y});
 //# sourceMappingURL=shuffle.min.js.map
diff --git a/dist/shuffle.min.js.map b/dist/shuffle.min.js.map
index 25a2331..c7970f7 100644
--- a/dist/shuffle.min.js.map
+++ b/dist/shuffle.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"shuffle.min.js","sources":["../node_modules/matches-selector/index.js","../node_modules/xtend/immutable.js","../node_modules/throttleit/index.js","../node_modules/array-parallel/index.js","../src/get-number.js","../src/get-number-style.js","../src/sorter.js","../src/on-transition-end.js","../src/array-max.js","../src/array-min.js","../src/layout.js","../src/shuffle.js","../node_modules/custom-event-polyfill/custom-event-polyfill.js","../node_modules/array-uniq/index.js","../src/point.js","../src/classes.js","../src/shuffle-item.js","../src/computed-size.js"],"sourcesContent":["'use strict';\n\nvar proto = Element.prototype;\nvar vendor = proto.matches\n  || proto.matchesSelector\n  || proto.webkitMatchesSelector\n  || proto.mozMatchesSelector\n  || proto.msMatchesSelector\n  || proto.oMatchesSelector;\n\nmodule.exports = match;\n\n/**\n * Match `el` to `selector`.\n *\n * @param {Element} el\n * @param {String} selector\n * @return {Boolean}\n * @api public\n */\n\nfunction match(el, selector) {\n  if (vendor) return vendor.call(el, selector);\n  var nodes = el.parentNode.querySelectorAll(selector);\n  for (var i = 0; i < nodes.length; i++) {\n    if (nodes[i] == el) return true;\n  }\n  return false;\n}","module.exports = extend\n\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\n\nfunction extend() {\n    var target = {}\n\n    for (var i = 0; i < arguments.length; i++) {\n        var source = arguments[i]\n\n        for (var key in source) {\n            if (hasOwnProperty.call(source, key)) {\n                target[key] = source[key]\n            }\n        }\n    }\n\n    return target\n}\n","module.exports = throttle;\n\n/**\n * Returns a new function that, when invoked, invokes `func` at most once per `wait` milliseconds.\n *\n * @param {Function} func Function to wrap.\n * @param {Number} wait Number of milliseconds that must elapse between `func` invocations.\n * @return {Function} A new function that wraps the `func` function passed in.\n */\n\nfunction throttle (func, wait) {\n  var ctx, args, rtn, timeoutID; // caching\n  var last = 0;\n\n  return function throttled () {\n    ctx = this;\n    args = arguments;\n    var delta = new Date() - last;\n    if (!timeoutID)\n      if (delta >= wait) call();\n      else timeoutID = setTimeout(call, wait - delta);\n    return rtn;\n  };\n\n  function call () {\n    timeoutID = 0;\n    last = +new Date();\n    rtn = func.apply(ctx, args);\n    ctx = null;\n    args = null;\n  }\n}\n","module.exports = function parallel(fns, context, callback) {\n  if (!callback) {\n    if (typeof context === 'function') {\n      callback = context\n      context = null\n    } else {\n      callback = noop\n    }\n  }\n\n  var pending = fns && fns.length\n  if (!pending) return callback(null, []);\n\n  var finished = false\n  var results = new Array(pending)\n\n  fns.forEach(context ? function (fn, i) {\n    fn.call(context, maybeDone(i))\n  } : function (fn, i) {\n    fn(maybeDone(i))\n  })\n\n  function maybeDone(i) {\n    return function (err, result) {\n      if (finished) return;\n\n      if (err) {\n        callback(err, results)\n        finished = true\n        return\n      }\n\n      results[i] = result\n\n      if (!--pending) callback(null, results);\n    }\n  }\n}\n\nfunction noop() {}\n","/**\n * Always returns a numeric value, given a value. Logic from jQuery's `isNumeric`.\n * @param {*} value Possibly numeric value.\n * @return {number} `value` or zero if `value` isn't numeric.\n */\nexport default function getNumber(value) {\n  return parseFloat(value) || 0;\n}\n","import getNumber from './get-number';\nimport COMPUTED_SIZE_INCLUDES_PADDING from './computed-size';\n\n/**\n * Retrieve the computed style for an element, parsed as a float.\n * @param {Element} element Element to get style for.\n * @param {string} style Style property.\n * @param {CSSStyleDeclaration} [styles] Optionally include clean styles to\n *     use instead of asking for them again.\n * @return {number} The parsed computed value or zero if that fails because IE\n *     will return 'auto' when the element doesn't have margins instead of\n *     the computed style.\n */\nexport default function getNumberStyle(element, style,\n  styles = window.getComputedStyle(element, null)) {\n  let value = getNumber(styles[style]);\n\n  // Support IE<=11 and W3C spec.\n  if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'width') {\n    value += getNumber(styles.paddingLeft) +\n      getNumber(styles.paddingRight) +\n      getNumber(styles.borderLeftWidth) +\n      getNumber(styles.borderRightWidth);\n  } else if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'height') {\n    value += getNumber(styles.paddingTop) +\n      getNumber(styles.paddingBottom) +\n      getNumber(styles.borderTopWidth) +\n      getNumber(styles.borderBottomWidth);\n  }\n\n  return value;\n}\n","import xtend from 'xtend';\n\n/**\n * Fisher-Yates shuffle.\n * http://stackoverflow.com/a/962890/373422\n * https://bost.ocks.org/mike/shuffle/\n * @param {Array} array Array to shuffle.\n * @return {Array} Randomly sorted array.\n */\nfunction randomize(array) {\n  let n = array.length;\n\n  while (n) {\n    n -= 1;\n    const i = Math.floor(Math.random() * (n + 1));\n    const temp = array[i];\n    array[i] = array[n];\n    array[n] = temp;\n  }\n\n  return array;\n}\n\nconst defaults = {\n  // Use array.reverse() to reverse the results\n  reverse: false,\n\n  // Sorting function\n  by: null,\n\n  // If true, this will skip the sorting and return a randomized order in the array\n  randomize: false,\n\n  // Determines which property of each item in the array is passed to the\n  // sorting method.\n  key: 'element',\n};\n\n// You can return `undefined` from the `by` function to revert to DOM order.\nexport default function sorter(arr, options) {\n  const opts = xtend(defaults, options);\n  const original = [].slice.call(arr);\n  let revert = false;\n\n  if (!arr.length) {\n    return [];\n  }\n\n  if (opts.randomize) {\n    return randomize(arr);\n  }\n\n  // Sort the elements by the opts.by function.\n  // If we don't have opts.by, default to DOM order\n  if (typeof opts.by === 'function') {\n    arr.sort((a, b) => {\n      // Exit early if we already know we want to revert\n      if (revert) {\n        return 0;\n      }\n\n      const valA = opts.by(a[opts.key]);\n      const valB = opts.by(b[opts.key]);\n\n      // If both values are undefined, use the DOM order\n      if (valA === undefined && valB === undefined) {\n        revert = true;\n        return 0;\n      }\n\n      if (valA < valB || valA === 'sortFirst' || valB === 'sortLast') {\n        return -1;\n      }\n\n      if (valA > valB || valA === 'sortLast' || valB === 'sortFirst') {\n        return 1;\n      }\n\n      return 0;\n    });\n  }\n\n  // Revert to the original array if necessary\n  if (revert) {\n    return original;\n  }\n\n  if (opts.reverse) {\n    arr.reverse();\n  }\n\n  return arr;\n}\n","const transitions = {};\nconst eventName = 'transitionend';\nlet count = 0;\n\nfunction uniqueId() {\n  count += 1;\n  return eventName + count;\n}\n\nexport function cancelTransitionEnd(id) {\n  if (transitions[id]) {\n    transitions[id].element.removeEventListener(eventName, transitions[id].listener);\n    transitions[id] = null;\n    return true;\n  }\n\n  return false;\n}\n\nexport function onTransitionEnd(element, callback) {\n  const id = uniqueId();\n  const listener = (evt) => {\n    if (evt.currentTarget === evt.target) {\n      cancelTransitionEnd(id);\n      callback(evt);\n    }\n  };\n\n  element.addEventListener(eventName, listener);\n\n  transitions[id] = { element, listener };\n\n  return id;\n}\n","export default function arrayMax(array) {\n  return Math.max.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","export default function arrayMin(array) {\n  return Math.min.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","import Point from './point';\nimport arrayMax from './array-max';\nimport arrayMin from './array-min';\n\n/**\n * Determine the number of columns an items spans.\n * @param {number} itemWidth Width of the item.\n * @param {number} columnWidth Width of the column (includes gutter).\n * @param {number} columns Total number of columns\n * @param {number} threshold A buffer value for the size of the column to fit.\n * @return {number}\n */\nexport function getColumnSpan(itemWidth, columnWidth, columns, threshold) {\n  let columnSpan = itemWidth / columnWidth;\n\n  // If the difference between the rounded column span number and the\n  // calculated column span number is really small, round the number to\n  // make it fit.\n  if (Math.abs(Math.round(columnSpan) - columnSpan) < threshold) {\n    // e.g. columnSpan = 4.0089945390298745\n    columnSpan = Math.round(columnSpan);\n  }\n\n  // Ensure the column span is not more than the amount of columns in the whole layout.\n  return Math.min(Math.ceil(columnSpan), columns);\n}\n\n/**\n * Retrieves the column set to use for placement.\n * @param {number} columnSpan The number of columns this current item spans.\n * @param {number} columns The total columns in the grid.\n * @return {Array.<number>} An array of numbers represeting the column set.\n */\nexport function getAvailablePositions(positions, columnSpan, columns) {\n  // The item spans only one column.\n  if (columnSpan === 1) {\n    return positions;\n  }\n\n  // The item spans more than one column, figure out how many different\n  // places it could fit horizontally.\n  // The group count is the number of places within the positions this block\n  // could fit, ignoring the current positions of items.\n  // Imagine a 2 column brick as the second item in a 4 column grid with\n  // 10px height each. Find the places it would fit:\n  // [20, 10, 10, 0]\n  //  |   |   |\n  //  *   *   *\n  //\n  // Then take the places which fit and get the bigger of the two:\n  // max([20, 10]), max([10, 10]), max([10, 0]) = [20, 10, 0]\n  //\n  // Next, find the first smallest number (the short column).\n  // [20, 10, 0]\n  //          |\n  //          *\n  //\n  // And that's where it should be placed!\n  //\n  // Another example where the second column's item extends past the first:\n  // [10, 20, 10, 0] => [20, 20, 10] => 10\n  const available = [];\n\n  // For how many possible positions for this item there are.\n  for (let i = 0; i <= columns - columnSpan; i++) {\n    // Find the bigger value for each place it could fit.\n    available.push(arrayMax(positions.slice(i, i + columnSpan)));\n  }\n\n  return available;\n}\n\n/**\n * Find index of short column, the first from the left where this item will go.\n *\n * @param {Array.<number>} positions The array to search for the smallest number.\n * @param {number} buffer Optional buffer which is very useful when the height\n *     is a percentage of the width.\n * @return {number} Index of the short column.\n */\nexport function getShortColumn(positions, buffer) {\n  const minPosition = arrayMin(positions);\n  for (let i = 0, len = positions.length; i < len; i++) {\n    if (positions[i] >= minPosition - buffer && positions[i] <= minPosition + buffer) {\n      return i;\n    }\n  }\n\n  return 0;\n}\n\n/**\n * Determine the location of the next item, based on its size.\n * @param {Object} itemSize Object with width and height.\n * @param {Array.<number>} positions Positions of the other current items.\n * @param {number} gridSize The column width or row height.\n * @param {number} total The total number of columns or rows.\n * @param {number} threshold Buffer value for the column to fit.\n * @param {number} buffer Vertical buffer for the height of items.\n * @return {Point}\n */\nexport function getItemPosition({ itemSize, positions, gridSize, total, threshold, buffer }) {\n  const span = getColumnSpan(itemSize.width, gridSize, total, threshold);\n  const setY = getAvailablePositions(positions, span, total);\n  const shortColumnIndex = getShortColumn(setY, buffer);\n\n  // Position the item\n  const point = new Point(\n    Math.round(gridSize * shortColumnIndex),\n    Math.round(setY[shortColumnIndex]));\n\n  // Update the columns array with the new values for each column.\n  // e.g. before the update the columns could be [250, 0, 0, 0] for an item\n  // which spans 2 columns. After it would be [250, itemHeight, itemHeight, 0].\n  const setHeight = setY[shortColumnIndex] + itemSize.height;\n  for (let i = 0; i < span; i++) {\n    positions[shortColumnIndex + i] = setHeight;\n  }\n\n  return point;\n}\n","import 'custom-event-polyfill';\nimport matches from 'matches-selector';\nimport arrayUnique from 'array-uniq';\nimport xtend from 'xtend';\nimport throttle from 'throttleit';\nimport parallel from 'array-parallel';\nimport Point from './point';\nimport ShuffleItem from './shuffle-item';\nimport Classes from './classes';\nimport getNumberStyle from './get-number-style';\nimport sorter from './sorter';\nimport { onTransitionEnd, cancelTransitionEnd } from './on-transition-end';\nimport { getItemPosition, getColumnSpan, getAvailablePositions, getShortColumn } from './layout';\nimport arrayMax from './array-max';\n\nfunction toArray(arrayLike) {\n  return Array.prototype.slice.call(arrayLike);\n}\n\nfunction arrayIncludes(array, obj) {\n  if (arguments.length === 2) {\n    return arrayIncludes(array)(obj);\n  }\n\n  return obj => array.indexOf(obj) > -1;\n}\n\n// Used for unique instance variables\nlet id = 0;\n\nclass Shuffle {\n\n  /**\n   * Categorize, sort, and filter a responsive grid of items.\n   *\n   * @param {Element} element An element which is the parent container for the grid items.\n   * @param {Object} [options=Shuffle.options] Options object.\n   * @constructor\n   */\n  constructor(element, options = {}) {\n    this.options = xtend(Shuffle.options, options);\n\n    this.useSizer = false;\n    this.lastSort = {};\n    this.group = Shuffle.ALL_ITEMS;\n    this.lastFilter = Shuffle.ALL_ITEMS;\n    this.isEnabled = true;\n    this.isDestroyed = false;\n    this.isInitialized = false;\n    this._transitions = [];\n    this.isTransitioning = false;\n    this._queue = [];\n\n    const el = this._getElementOption(element);\n\n    if (!el) {\n      throw new TypeError('Shuffle needs to be initialized with an element.');\n    }\n\n    this.element = el;\n    this.id = 'shuffle_' + id;\n    id += 1;\n\n    this._init();\n    this.isInitialized = true;\n  }\n\n  _init() {\n    this.items = this._getItems();\n\n    this.options.sizer = this._getElementOption(this.options.sizer);\n\n    if (this.options.sizer) {\n      this.useSizer = true;\n    }\n\n    // Add class and invalidate styles\n    this.element.classList.add(Shuffle.Classes.BASE);\n\n    // Set initial css for each item\n    this._initItems();\n\n    // Bind resize events\n    this._onResize = this._getResizeFunction();\n    window.addEventListener('resize', this._onResize);\n\n    // Get container css all in one request. Causes reflow\n    const containerCss = window.getComputedStyle(this.element, null);\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // Add styles to the container if it doesn't have them.\n    this._validateStyles(containerCss);\n\n    // We already got the container's width above, no need to cause another\n    // reflow getting it again... Calculate the number of columns there will be\n    this._setColumns(containerWidth);\n\n    // Kick off!\n    this.filter(this.options.group, this.options.initialSort);\n\n    // The shuffle items haven't had transitions set on them yet so the user\n    // doesn't see the first layout. Set them now that the first layout is done.\n    // First, however, a synchronous layout must be caused for the previous\n    // styles to be applied without transitions.\n    this.element.offsetWidth; // eslint-disable-line no-unused-expressions\n    this._setTransitions();\n    this.element.style.transition = 'height ' + this.options.speed + 'ms ' + this.options.easing;\n  }\n\n  /**\n   * Returns a throttled and proxied function for the resize handler.\n   * @return {Function}\n   * @private\n   */\n  _getResizeFunction() {\n    const resizeFunction = this._handleResize.bind(this);\n    return this.options.throttle ?\n        this.options.throttle(resizeFunction, this.options.throttleTime) :\n        resizeFunction;\n  }\n\n  /**\n   * Retrieve an element from an option.\n   * @param {string|jQuery|Element} option The option to check.\n   * @return {?Element} The plain element or null.\n   * @private\n   */\n  _getElementOption(option) {\n    // If column width is a string, treat is as a selector and search for the\n    // sizer element within the outermost container\n    if (typeof option === 'string') {\n      return this.element.querySelector(option);\n\n    // Check for an element\n    } else if (option && option.nodeType && option.nodeType === 1) {\n      return option;\n\n    // Check for jQuery object\n    } else if (option && option.jquery) {\n      return option[0];\n    }\n\n    return null;\n  }\n\n  /**\n   * Ensures the shuffle container has the css styles it needs applied to it.\n   * @param {Object} styles Key value pairs for position and overflow.\n   * @private\n   */\n  _validateStyles(styles) {\n    // Position cannot be static.\n    if (styles.position === 'static') {\n      this.element.style.position = 'relative';\n    }\n\n    // Overflow has to be hidden.\n    if (styles.overflow !== 'hidden') {\n      this.element.style.overflow = 'hidden';\n    }\n  }\n\n  /**\n   * Filter the elements by a category.\n   * @param {string} [category] Category to filter by. If it's given, the last\n   *     category will be used to filter the items.\n   * @param {Array} [collection] Optionally filter a collection. Defaults to\n   *     all the items.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _filter(category = this.lastFilter, collection = this.items) {\n    const set = this._getFilteredSets(category, collection);\n\n    // Individually add/remove hidden/visible classes\n    this._toggleFilterClasses(set);\n\n    // Save the last filter in case elements are appended.\n    this.lastFilter = category;\n\n    // This is saved mainly because providing a filter function (like searching)\n    // will overwrite the `lastFilter` property every time its called.\n    if (typeof category === 'string') {\n      this.group = category;\n    }\n\n    return set;\n  }\n\n  /**\n   * Returns an object containing the visible and hidden elements.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Array.<Element>} items A collection of items to filter.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _getFilteredSets(category, items) {\n    let visible = [];\n    const hidden = [];\n\n    // category === 'all', add visible class to everything\n    if (category === Shuffle.ALL_ITEMS) {\n      visible = items;\n\n    // Loop through each item and use provided function to determine\n    // whether to hide it or not.\n    } else {\n      items.forEach((item) => {\n        if (this._doesPassFilter(category, item.element)) {\n          visible.push(item);\n        } else {\n          hidden.push(item);\n        }\n      });\n    }\n\n    return {\n      visible,\n      hidden,\n    };\n  }\n\n  /**\n   * Test an item to see if it passes a category.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Element} element An element to test.\n   * @return {boolean} Whether it passes the category/filter.\n   * @private\n   */\n  _doesPassFilter(category, element) {\n    if (typeof category === 'function') {\n      return category.call(element, element, this);\n\n    // Check each element's data-groups attribute against the given category.\n    }\n    const attr = element.getAttribute('data-' + Shuffle.FILTER_ATTRIBUTE_KEY);\n    const keys = this.options.delimeter ?\n          attr.split(this.options.delimeter) :\n          JSON.parse(attr);\n\n    if (Array.isArray(category)) {\n      if(this.options.filterMode!=Shuffle.filterMode.EXCLUSIVE){\n        return category.every(arrayIncludes(keys));\n      } else {\n        return category.some(arrayIncludes(keys));\n      }\n    }\n\n    return arrayIncludes(keys, category);\n  }\n\n  /**\n   * Toggles the visible and hidden class names.\n   * @param {{visible, hidden}} Object with visible and hidden arrays.\n   * @private\n   */\n  _toggleFilterClasses({ visible, hidden }) {\n    visible.forEach((item) => {\n      item.show();\n    });\n\n    hidden.forEach((item) => {\n      item.hide();\n    });\n  }\n\n  /**\n   * Set the initial css for each item\n   * @param {Array.<ShuffleItem>} [items] Optionally specifiy at set to initialize.\n   * @private\n   */\n  _initItems(items = this.items) {\n    items.forEach((item) => {\n      item.init();\n    });\n  }\n\n  /**\n   * Remove element reference and styles.\n   * @private\n   */\n  _disposeItems(items = this.items) {\n    items.forEach((item) => {\n      item.dispose();\n    });\n  }\n\n  /**\n   * Updates the visible item count.\n   * @private\n   */\n  _updateItemCount() {\n    this.visibleItems = this._getFilteredItems().length;\n  }\n\n  /**\n   * Sets css transform transition on a group of elements. This is not executed\n   * at the same time as `item.init` so that transitions don't occur upon\n   * initialization of Shuffle.\n   * @param {Array.<ShuffleItem>} items Shuffle items to set transitions on.\n   * @private\n   */\n  _setTransitions(items = this.items) {\n    const speed = this.options.speed;\n    const easing = this.options.easing;\n\n    const str = this.options.useTransforms ?\n      `transform ${speed}ms ${easing}, opacity ${speed}ms ${easing}` :\n      `top ${speed}ms ${easing}, left ${speed}ms ${easing}, opacity ${speed}ms ${easing}`;\n\n    items.forEach((item) => {\n      item.element.style.transition = str;\n    });\n  }\n\n  _getItems() {\n    return toArray(this.element.children)\n      .filter(el => matches(el, this.options.itemSelector))\n      .map(el => new ShuffleItem(el));\n  }\n\n  /**\n   * When new elements are added to the shuffle container, update the array of\n   * items because that is the order `_layout` calls them.\n   */\n  _updateItemsOrder() {\n    const children = this.element.children;\n    this.items = sorter(this.items, {\n      by(element) {\n        return Array.prototype.indexOf.call(children, element);\n      },\n    });\n  }\n\n  _getFilteredItems() {\n    return this.items.filter(item => item.isVisible);\n  }\n\n  _getConcealedItems() {\n    return this.items.filter(item => !item.isVisible);\n  }\n\n  /**\n   * Returns the column size, based on column width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @param {number} gutterSize Size of the gutters.\n   * @return {number}\n   * @private\n   */\n  _getColumnSize(containerWidth, gutterSize) {\n    let size;\n\n    // If the columnWidth property is a function, then the grid is fluid\n    if (typeof this.options.columnWidth === 'function') {\n      size = this.options.columnWidth(containerWidth);\n\n    // columnWidth option isn't a function, are they using a sizing element?\n    } else if (this.useSizer) {\n      size = Shuffle.getSize(this.options.sizer).width;\n\n    // if not, how about the explicitly set option?\n    } else if (this.options.columnWidth) {\n      size = this.options.columnWidth;\n\n    // or use the size of the first item\n    } else if (this.items.length > 0) {\n      size = Shuffle.getSize(this.items[0].element, true).width;\n\n    // if there's no items, use size of container\n    } else {\n      size = containerWidth;\n    }\n\n    // Don't let them set a column width of zero.\n    if (size === 0) {\n      size = containerWidth;\n    }\n\n    return size + gutterSize;\n  }\n\n  /**\n   * Returns the gutter size, based on gutter width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @return {number}\n   * @private\n   */\n  _getGutterSize(containerWidth) {\n    let size;\n    if (typeof this.options.gutterWidth === 'function') {\n      size = this.options.gutterWidth(containerWidth);\n    } else if (this.useSizer) {\n      size = getNumberStyle(this.options.sizer, 'marginLeft');\n    } else {\n      size = this.options.gutterWidth;\n    }\n\n    return size;\n  }\n\n  /**\n   * Calculate the number of columns to be used. Gets css if using sizer element.\n   * @param {number} [containerWidth] Optionally specify a container width if\n   *    it's already available.\n   */\n  _setColumns(containerWidth = Shuffle.getSize(this.element).width) {\n    const gutter = this._getGutterSize(containerWidth);\n    const columnWidth = this._getColumnSize(containerWidth, gutter);\n    let calculatedColumns = (containerWidth + gutter) / columnWidth;\n\n    // Widths given from getStyles are not precise enough...\n    if (Math.abs(Math.round(calculatedColumns) - calculatedColumns) <\n        this.options.columnThreshold) {\n      // e.g. calculatedColumns = 11.998876\n      calculatedColumns = Math.round(calculatedColumns);\n    }\n\n    this.cols = Math.max(Math.floor(calculatedColumns), 1);\n    this.containerWidth = containerWidth;\n    this.colWidth = columnWidth;\n  }\n\n  /**\n   * Adjust the height of the grid\n   */\n  _setContainerSize() {\n    this.element.style.height = this._getContainerSize() + 'px';\n  }\n\n  /**\n   * Based on the column heights, it returns the biggest one.\n   * @return {number}\n   * @private\n   */\n  _getContainerSize() {\n    return arrayMax(this.positions);\n  }\n\n  /**\n   * Get the clamped stagger amount.\n   * @param {number} index Index of the item to be staggered.\n   * @return {number}\n   */\n  _getStaggerAmount(index) {\n    return Math.min(index * this.options.staggerAmount, this.options.staggerAmountMax);\n  }\n\n  /**\n   * @return {boolean} Whether the event was prevented or not.\n   */\n  _dispatch(name, details = {}) {\n    if (this.isDestroyed) {\n      return false;\n    }\n\n    details.shuffle = this;\n    return !this.element.dispatchEvent(new CustomEvent(name, {\n      bubbles: true,\n      cancelable: false,\n      detail: details,\n    }));\n  }\n\n  /**\n   * Zeros out the y columns array, which is used to determine item placement.\n   * @private\n   */\n  _resetCols() {\n    let i = this.cols;\n    this.positions = [];\n    while (i) {\n      i -= 1;\n      this.positions.push(0);\n    }\n  }\n\n  /**\n   * Loops through each item that should be shown and calculates the x, y position.\n   * @param {Array.<ShuffleItem>} items Array of items that will be shown/layed\n   *     out in order in their array.\n   */\n  _layout(items) {\n    let count = 0;\n    items.forEach((item) => {\n      const currPos = item.point;\n      const currScale = item.scale;\n      const itemSize = Shuffle.getSize(item.element, true);\n      const pos = this._getItemPosition(itemSize);\n\n      function callback() {\n        item.element.style.transitionDelay = '';\n        item.applyCss(ShuffleItem.Css.VISIBLE.after);\n      }\n\n      // If the item will not change its position, do not add it to the render\n      // queue. Transitions don't fire when setting a property to the same value.\n      if (Point.equals(currPos, pos) && currScale === ShuffleItem.Scale.VISIBLE) {\n        item.applyCss(ShuffleItem.Css.VISIBLE.before);\n        callback();\n        return;\n      }\n\n      item.point = pos;\n      item.scale = ShuffleItem.Scale.VISIBLE;\n\n      // Use xtend here to clone the object so that the `before` object isn't\n      // modified when the transition delay is added.\n      const styles = xtend(ShuffleItem.Css.VISIBLE.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Determine the location of the next item, based on its size.\n   * @param {{width: number, height: number}} itemSize Object with width and height.\n   * @return {Point}\n   * @private\n   */\n  _getItemPosition(itemSize) {\n    return getItemPosition({\n      itemSize,\n      positions: this.positions,\n      gridSize: this.colWidth,\n      total: this.cols,\n      threshold: this.options.columnThreshold,\n      buffer: this.options.buffer,\n    });\n  }\n\n  /**\n   * Hides the elements that don't match our filter.\n   * @param {Array.<ShuffleItem>} collection Collection to shrink.\n   * @private\n   */\n  _shrink(collection = this._getConcealedItems()) {\n    let count = 0;\n    collection.forEach((item) => {\n      function callback() {\n        item.applyCss(ShuffleItem.Css.HIDDEN.after);\n      }\n\n      // Continuing would add a transitionend event listener to the element, but\n      // that listener would not execute because the transform and opacity would\n      // stay the same.\n      // The callback is executed here because it is not guaranteed to be called\n      // after the transitionend event because the transitionend could be\n      // canceled if another animation starts.\n      if (item.scale === ShuffleItem.Scale.HIDDEN) {\n        item.applyCss(ShuffleItem.Css.HIDDEN.before);\n        callback();\n        return;\n      }\n\n      item.scale = ShuffleItem.Scale.HIDDEN;\n\n      const styles = xtend(ShuffleItem.Css.HIDDEN.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Resize handler.\n   * @private\n   */\n  _handleResize() {\n    // If shuffle is disabled, destroyed, don't do anything\n    if (!this.isEnabled || this.isDestroyed) {\n      return;\n    }\n\n    // Will need to check height in the future if it's layed out horizontaly\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // containerWidth hasn't changed, don't do anything\n    if (containerWidth === this.containerWidth) {\n      return;\n    }\n\n    this.update();\n  }\n\n  /**\n   * Returns styles which will be applied to the an item for a transition.\n   * @param {Object} obj Transition options.\n   * @return {!Object} Transforms for transitions, left/top for animate.\n   * @private\n   */\n  _getStylesForTransition({ item, styles }) {\n    if (!styles.transitionDelay) {\n      styles.transitionDelay = '0ms';\n    }\n\n    const x = item.point.x;\n    const y = item.point.y;\n\n    if (this.options.useTransforms) {\n      styles.transform = `translate(${x}px, ${y}px) scale(${item.scale})`;\n    } else {\n      styles.left = x + 'px';\n      styles.top = y + 'px';\n    }\n\n    return styles;\n  }\n\n  /**\n   * Listen for the transition end on an element and execute the itemCallback\n   * when it finishes.\n   * @param {Element} element Element to listen on.\n   * @param {Function} itemCallback Callback for the item.\n   * @param {Function} done Callback to notify `parallel` that this one is done.\n   */\n  _whenTransitionDone(element, itemCallback, done) {\n    const id = onTransitionEnd(element, (evt) => {\n      itemCallback();\n      done(null, evt);\n    });\n\n    this._transitions.push(id);\n  }\n\n  /**\n   * Return a function which will set CSS styles and call the `done` function\n   * when (if) the transition finishes.\n   * @param {Object} opts Transition object.\n   * @return {Function} A function to be called with a `done` function.\n   */\n  _getTransitionFunction(opts) {\n    return (done) => {\n      opts.item.applyCss(this._getStylesForTransition(opts));\n      this._whenTransitionDone(opts.item.element, opts.callback, done);\n    };\n  }\n\n  /**\n   * Execute the styles gathered in the style queue. This applies styles to elements,\n   * triggering transitions.\n   * @private\n   */\n  _processQueue() {\n    if (this.isTransitioning) {\n      this._cancelMovement();\n    }\n\n    const hasSpeed = this.options.speed > 0;\n    const hasQueue = this._queue.length > 0;\n\n    if (hasQueue && hasSpeed && this.isInitialized) {\n      this._startTransitions(this._queue);\n    } else if (hasQueue) {\n      this._styleImmediately(this._queue);\n      this._dispatchLayout();\n\n    // A call to layout happened, but none of the newly visible items will\n    // change position or the transition duration is zero, which will not trigger\n    // the transitionend event.\n    } else {\n      this._dispatchLayout();\n    }\n\n    // Remove everything in the style queue\n    this._queue.length = 0;\n  }\n\n  /**\n   * Wait for each transition to finish, the emit the layout event.\n   * @param {Array.<Object>} transitions Array of transition objects.\n   */\n  _startTransitions(transitions) {\n    // Set flag that shuffle is currently in motion.\n    this.isTransitioning = true;\n\n    // Create an array of functions to be called.\n    const callbacks = transitions.map(obj => this._getTransitionFunction(obj));\n\n    parallel(callbacks, this._movementFinished.bind(this));\n  }\n\n  _cancelMovement() {\n    // Remove the transition end event for each listener.\n    this._transitions.forEach(cancelTransitionEnd);\n\n    // Reset the array.\n    this._transitions.length = 0;\n\n    // Show it's no longer active.\n    this.isTransitioning = false;\n  }\n\n  /**\n   * Apply styles without a transition.\n   * @param {Array.<Object>} objects Array of transition objects.\n   * @private\n   */\n  _styleImmediately(objects) {\n    if (objects.length) {\n      const elements = objects.map(obj => obj.item.element);\n\n      Shuffle._skipTransitions(elements, () => {\n        objects.forEach((obj) => {\n          obj.item.applyCss(this._getStylesForTransition(obj));\n          obj.callback();\n        });\n      });\n    }\n  }\n\n  _movementFinished() {\n    this._transitions.length = 0;\n    this.isTransitioning = false;\n    this._dispatchLayout();\n  }\n\n  _dispatchLayout() {\n    this._dispatch(Shuffle.EventType.LAYOUT);\n  }\n\n  /**\n   * The magic. This is what makes the plugin 'shuffle'\n   * @param {string|Function|Array.<string>} [category] Category to filter by.\n   *     Can be a function, string, or array of strings.\n   * @param {Object} [sortObj] A sort object which can sort the visible set\n   */\n  filter(category, sortObj) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    if (!category || (category && category.length === 0)) {\n      category = Shuffle.ALL_ITEMS; // eslint-disable-line no-param-reassign\n    }\n\n    this._filter(category);\n\n    // Shrink each hidden item\n    this._shrink();\n\n    // How many visible elements?\n    this._updateItemCount();\n\n    // Update transforms on visible elements so they will animate to their new positions.\n    this.sort(sortObj);\n  }\n\n  /**\n   * Gets the visible elements, sorts them, and passes them to layout.\n   * @param {Object} opts the options object for the sorted plugin\n   */\n  sort(opts = this.lastSort) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    this._resetCols();\n\n    let items = this._getFilteredItems();\n    items = sorter(items, opts);\n\n    this._layout(items);\n\n    // `_layout` always happens after `_shrink`, so it's safe to process the style\n    // queue here with styles from the shrink method.\n    this._processQueue();\n\n    // Adjust the height of the container.\n    this._setContainerSize();\n\n    this.lastSort = opts;\n  }\n\n  /**\n   * Reposition everything.\n   * @param {boolean} isOnlyLayout If true, column and gutter widths won't be\n   *     recalculated.\n   */\n  update(isOnlyLayout) {\n    if (this.isEnabled) {\n      if (!isOnlyLayout) {\n        // Get updated colCount\n        this._setColumns();\n      }\n\n      // Layout items\n      this.sort();\n    }\n  }\n\n  /**\n   * Use this instead of `update()` if you don't need the columns and gutters updated\n   * Maybe an image inside `shuffle` loaded (and now has a height), which means calculations\n   * could be off.\n   */\n  layout() {\n    this.update(true);\n  }\n\n  /**\n   * New items have been appended to shuffle. Mix them in with the current\n   * filter or sort status.\n   * @param {Array.<Element>} newItems Collection of new items.\n   */\n  add(newItems) {\n    const items = arrayUnique(newItems).map(el => new ShuffleItem(el));\n\n    // Add classes and set initial positions.\n    this._initItems(items);\n\n    // Add transition to each item.\n    this._setTransitions(items);\n\n    // Update the list of items.\n    this.items = this.items.concat(items);\n    this._updateItemsOrder();\n    this.filter(this.lastFilter);\n  }\n\n  /**\n   * Disables shuffle from updating dimensions and layout on resize\n   */\n  disable() {\n    this.isEnabled = false;\n  }\n\n  /**\n   * Enables shuffle again\n   * @param {boolean} [isUpdateLayout=true] if undefined, shuffle will update columns and gutters\n   */\n  enable(isUpdateLayout) {\n    this.isEnabled = true;\n    if (isUpdateLayout !== false) {\n      this.update();\n    }\n  }\n\n  /**\n   * Remove 1 or more shuffle items\n   * @param {Array.<Element>} elements An array containing one or more\n   *     elements in shuffle\n   * @return {Shuffle} The shuffle object\n   */\n  remove(elements) {\n    if (!elements.length) {\n      return;\n    }\n\n    const collection = arrayUnique(elements);\n\n    const oldItems = collection\n      .map(element => this.getItemByElement(element))\n      .filter(item => !!item);\n\n    const handleLayout = () => {\n      this.element.removeEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n      this._disposeItems(oldItems);\n\n      // Remove the collection in the callback\n      collection.forEach((element) => {\n        element.parentNode.removeChild(element);\n      });\n\n      this._dispatch(Shuffle.EventType.REMOVED, { collection });\n    };\n\n    // Hide collection first.\n    this._toggleFilterClasses({\n      visible: [],\n      hidden: oldItems,\n    });\n\n    this._shrink(oldItems);\n\n    this.sort();\n\n    // Update the list of items here because `remove` could be called again\n    // with an item that is in the process of being removed.\n    this.items = this.items.filter(item => !arrayIncludes(oldItems, item));\n    this._updateItemCount();\n\n    this.element.addEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n  }\n\n  /**\n   * Retrieve a shuffle item by its element.\n   * @param {Element} element Element to look for.\n   * @return {?ShuffleItem} A shuffle item or null if it's not found.\n   */\n  getItemByElement(element) {\n    for (let i = this.items.length - 1; i >= 0; i--) {\n      if (this.items[i].element === element) {\n        return this.items[i];\n      }\n    }\n\n    return null;\n  }\n\n  /**\n   * Destroys shuffle, removes events, styles, and classes\n   */\n  destroy() {\n    this._cancelMovement();\n    window.removeEventListener('resize', this._onResize);\n\n    // Reset container styles\n    this.element.classList.remove('shuffle');\n    this.element.removeAttribute('style');\n\n    // Reset individual item styles\n    this._disposeItems();\n\n    // Null DOM references\n    this.items = null;\n    this.options.sizer = null;\n    this.element = null;\n    this._transitions = null;\n\n    // Set a flag so if a debounced resize has been triggered,\n    // it can first check if it is actually isDestroyed and not doing anything\n    this.isDestroyed = true;\n  }\n\n  /**\n   * Returns the outer width of an element, optionally including its margins.\n   *\n   * There are a few different methods for getting the width of an element, none of\n   * which work perfectly for all Shuffle's use cases.\n   *\n   * 1. getBoundingClientRect() `left` and `right` properties.\n   *   - Accounts for transform scaled elements, making it useless for Shuffle\n   *   elements which have shrunk.\n   * 2. The `offsetWidth` property.\n   *   - This value stays the same regardless of the elements transform property,\n   *   however, it does not return subpixel values.\n   * 3. getComputedStyle()\n   *   - This works great Chrome, Firefox, Safari, but IE<=11 does not include\n   *   padding and border when box-sizing: border-box is set, requiring a feature\n   *   test and extra work to add the padding back for IE and other browsers which\n   *   follow the W3C spec here.\n   *\n   * @param {Element} element The element.\n   * @param {boolean} [includeMargins] Whether to include margins. Default is false.\n   * @return {{width: number, height: number}} The width and height.\n   */\n  static getSize(element, includeMargins) {\n    // Store the styles so that they can be used by others without asking for it again.\n    const styles = window.getComputedStyle(element, null);\n    let width = getNumberStyle(element, 'width', styles);\n    let height = getNumberStyle(element, 'height', styles);\n\n    if (includeMargins) {\n      const marginLeft = getNumberStyle(element, 'marginLeft', styles);\n      const marginRight = getNumberStyle(element, 'marginRight', styles);\n      const marginTop = getNumberStyle(element, 'marginTop', styles);\n      const marginBottom = getNumberStyle(element, 'marginBottom', styles);\n      width += marginLeft + marginRight;\n      height += marginTop + marginBottom;\n    }\n\n    return {\n      width,\n      height,\n    };\n  }\n\n  /**\n   * Change a property or execute a function which will not have a transition\n   * @param {Array.<Element>} elements DOM elements that won't be transitioned.\n   * @param {Function} callback A function which will be called while transition\n   *     is set to 0ms.\n   * @private\n   */\n  static _skipTransitions(elements, callback) {\n    const zero = '0ms';\n\n    // Save current duration and delay.\n    const data = elements.map((element) => {\n      const style = element.style;\n      const duration = style.transitionDuration;\n      const delay = style.transitionDelay;\n\n      // Set the duration to zero so it happens immediately\n      style.transitionDuration = zero;\n      style.transitionDelay = zero;\n\n      return {\n        duration,\n        delay,\n      };\n    });\n\n    callback();\n\n    // Cause reflow.\n    elements[0].offsetWidth; // eslint-disable-line no-unused-expressions\n\n    // Put the duration back\n    elements.forEach((element, i) => {\n      element.style.transitionDuration = data[i].duration;\n      element.style.transitionDelay = data[i].delay;\n    });\n  }\n}\n\nShuffle.ShuffleItem = ShuffleItem;\n\nShuffle.ALL_ITEMS = 'all';\nShuffle.FILTER_ATTRIBUTE_KEY = 'groups';\n\n/**\n * @enum {string}\n */\nShuffle.EventType = {\n  LAYOUT: 'shuffle:layout',\n  REMOVED: 'shuffle:removed',\n};\n\n/** @enum {string} */\nShuffle.Classes = Classes;\n\n/**\n * @enum {string}\n */\nShuffle.filterMode = {\n  EXCLUSIVE: 'exclusive',\n  ADDITIVE: 'additive',\n};\n\n// Overrideable options\nShuffle.options = {\n  // Initial filter group.\n  group: Shuffle.ALL_ITEMS,\n\n  // Transition/animation speed (milliseconds).\n  speed: 250,\n\n  // CSS easing function to use.\n  easing: 'ease',\n\n  // e.g. '.picture-item'.\n  itemSelector: '*',\n\n  // Element or selector string. Use an element to determine the size of columns\n  // and gutters.\n  sizer: null,\n\n  // A static number or function that tells the plugin how wide the gutters\n  // between columns are (in pixels).\n  gutterWidth: 0,\n\n  // A static number or function that returns a number which tells the plugin\n  // how wide the columns are (in pixels).\n  columnWidth: 0,\n\n  // If your group is not json, and is comma delimeted, you could set delimeter\n  // to ','.\n  delimeter: null,\n\n  // Useful for percentage based heights when they might not always be exactly\n  // the same (in pixels).\n  buffer: 0,\n\n  // Reading the width of elements isn't precise enough and can cause columns to\n  // jump between values.\n  columnThreshold: 0.01,\n\n  // Shuffle can be isInitialized with a sort object. It is the same object\n  // given to the sort method.\n  initialSort: null,\n\n  // By default, shuffle will throttle resize events. This can be changed or\n  // removed.\n  throttle,\n\n  // How often shuffle can be called on resize (in milliseconds).\n  throttleTime: 300,\n\n  // Transition delay offset for each item in milliseconds.\n  staggerAmount: 15,\n\n  // Maximum stagger delay in milliseconds.\n  staggerAmountMax: 250,\n\n  // Whether to use transforms or absolute positioning.\n  useTransforms: true,\n\n  // Filters elements with \"some\" when 'exclusive' and with every on 'additive'\n  filterMode : Shuffle.filterMode.EXCLUSIVE,\n};\n\n// Expose for testing. 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Set();\n\treturn arr.filter(function (el) {\n\t\tif (!seen.has(el)) {\n\t\t\tseen.add(el);\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t});\n}\n\n// 3 - a standard Set type is defined and it has a forEach method\nfunction uniqSetWithForEach(arr) {\n\tvar ret = [];\n\n\t(new Set(arr)).forEach(function (el) {\n\t\tret.push(el);\n\t});\n\n\treturn ret;\n}\n\n// V8 currently has a broken implementation\n// https://github.com/joyent/node/issues/8449\nfunction doesForEachActuallyWork() {\n\tvar ret = false;\n\n\t(new Set([true])).forEach(function (el) {\n\t\tret = el;\n\t});\n\n\treturn ret === true;\n}\n\nif ('Set' in global) {\n\tif (typeof Set.prototype.forEach === 'function' && doesForEachActuallyWork()) {\n\t\tmodule.exports = uniqSetWithForEach;\n\t} else {\n\t\tmodule.exports = uniqSet;\n\t}\n} else {\n\tmodule.exports = uniqNoSet;\n}\n","import getNumber from './get-number';\n\nclass Point {\n\n  /**\n   * Represents a coordinate pair.\n   * @param {number} [x=0] X.\n   * 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\ No newline at end of file
+{"version":3,"file":"shuffle.min.js","sources":["../node_modules/matches-selector/index.js","../node_modules/xtend/immutable.js","../node_modules/throttleit/index.js","../node_modules/array-parallel/index.js","../src/get-number.js","../src/get-number-style.js","../src/sorter.js","../src/on-transition-end.js","../src/array-max.js","../src/array-min.js","../src/layout.js","../src/shuffle.js","../node_modules/custom-event-polyfill/custom-event-polyfill.js","../node_modules/array-uniq/index.js","../src/point.js","../src/classes.js","../src/shuffle-item.js","../src/computed-size.js"],"sourcesContent":["'use strict';\n\nvar proto = Element.prototype;\nvar vendor = proto.matches\n  || proto.matchesSelector\n  || proto.webkitMatchesSelector\n  || proto.mozMatchesSelector\n  || proto.msMatchesSelector\n  || proto.oMatchesSelector;\n\nmodule.exports = match;\n\n/**\n * Match `el` to `selector`.\n *\n * @param {Element} el\n * @param {String} selector\n * @return {Boolean}\n * @api public\n */\n\nfunction match(el, selector) {\n  if (vendor) return vendor.call(el, selector);\n  var nodes = el.parentNode.querySelectorAll(selector);\n  for (var i = 0; i < nodes.length; i++) {\n    if (nodes[i] == el) return true;\n  }\n  return false;\n}","module.exports = extend\n\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\n\nfunction extend() {\n    var target = {}\n\n    for (var i = 0; i < arguments.length; i++) {\n        var source = arguments[i]\n\n        for (var key in source) {\n            if (hasOwnProperty.call(source, key)) {\n                target[key] = source[key]\n            }\n        }\n    }\n\n    return target\n}\n","module.exports = throttle;\n\n/**\n * Returns a new function that, when invoked, invokes `func` at most once per `wait` milliseconds.\n *\n * @param {Function} func Function to wrap.\n * @param {Number} wait Number of milliseconds that must elapse between `func` invocations.\n * @return {Function} A new function that wraps the `func` function passed in.\n */\n\nfunction throttle (func, wait) {\n  var ctx, args, rtn, timeoutID; // caching\n  var last = 0;\n\n  return function throttled () {\n    ctx = this;\n    args = arguments;\n    var delta = new Date() - last;\n    if (!timeoutID)\n      if (delta >= wait) call();\n      else timeoutID = setTimeout(call, wait - delta);\n    return rtn;\n  };\n\n  function call () {\n    timeoutID = 0;\n    last = +new Date();\n    rtn = func.apply(ctx, args);\n    ctx = null;\n    args = null;\n  }\n}\n","module.exports = function parallel(fns, context, callback) {\n  if (!callback) {\n    if (typeof context === 'function') {\n      callback = context\n      context = null\n    } else {\n      callback = noop\n    }\n  }\n\n  var pending = fns && fns.length\n  if (!pending) return callback(null, []);\n\n  var finished = false\n  var results = new Array(pending)\n\n  fns.forEach(context ? function (fn, i) {\n    fn.call(context, maybeDone(i))\n  } : function (fn, i) {\n    fn(maybeDone(i))\n  })\n\n  function maybeDone(i) {\n    return function (err, result) {\n      if (finished) return;\n\n      if (err) {\n        callback(err, results)\n        finished = true\n        return\n      }\n\n      results[i] = result\n\n      if (!--pending) callback(null, results);\n    }\n  }\n}\n\nfunction noop() {}\n","/**\n * Always returns a numeric value, given a value. Logic from jQuery's `isNumeric`.\n * @param {*} value Possibly numeric value.\n * @return {number} `value` or zero if `value` isn't numeric.\n */\nexport default function getNumber(value) {\n  return parseFloat(value) || 0;\n}\n","import getNumber from './get-number';\nimport COMPUTED_SIZE_INCLUDES_PADDING from './computed-size';\n\n/**\n * Retrieve the computed style for an element, parsed as a float.\n * @param {Element} element Element to get style for.\n * @param {string} style Style property.\n * @param {CSSStyleDeclaration} [styles] Optionally include clean styles to\n *     use instead of asking for them again.\n * @return {number} The parsed computed value or zero if that fails because IE\n *     will return 'auto' when the element doesn't have margins instead of\n *     the computed style.\n */\nexport default function getNumberStyle(element, style,\n  styles = window.getComputedStyle(element, null)) {\n  let value = getNumber(styles[style]);\n\n  // Support IE<=11 and W3C spec.\n  if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'width') {\n    value += getNumber(styles.paddingLeft) +\n      getNumber(styles.paddingRight) +\n      getNumber(styles.borderLeftWidth) +\n      getNumber(styles.borderRightWidth);\n  } else if (!COMPUTED_SIZE_INCLUDES_PADDING && style === 'height') {\n    value += getNumber(styles.paddingTop) +\n      getNumber(styles.paddingBottom) +\n      getNumber(styles.borderTopWidth) +\n      getNumber(styles.borderBottomWidth);\n  }\n\n  return value;\n}\n","import xtend from 'xtend';\n\n/**\n * Fisher-Yates shuffle.\n * http://stackoverflow.com/a/962890/373422\n * https://bost.ocks.org/mike/shuffle/\n * @param {Array} array Array to shuffle.\n * @return {Array} Randomly sorted array.\n */\nfunction randomize(array) {\n  let n = array.length;\n\n  while (n) {\n    n -= 1;\n    const i = Math.floor(Math.random() * (n + 1));\n    const temp = array[i];\n    array[i] = array[n];\n    array[n] = temp;\n  }\n\n  return array;\n}\n\nconst defaults = {\n  // Use array.reverse() to reverse the results\n  reverse: false,\n\n  // Sorting function\n  by: null,\n\n  // If true, this will skip the sorting and return a randomized order in the array\n  randomize: false,\n\n  // Determines which property of each item in the array is passed to the\n  // sorting method.\n  key: 'element',\n};\n\n// You can return `undefined` from the `by` function to revert to DOM order.\nexport default function sorter(arr, options) {\n  const opts = xtend(defaults, options);\n  const original = [].slice.call(arr);\n  let revert = false;\n\n  if (!arr.length) {\n    return [];\n  }\n\n  if (opts.randomize) {\n    return randomize(arr);\n  }\n\n  // Sort the elements by the opts.by function.\n  // If we don't have opts.by, default to DOM order\n  if (typeof opts.by === 'function') {\n    arr.sort((a, b) => {\n      // Exit early if we already know we want to revert\n      if (revert) {\n        return 0;\n      }\n\n      const valA = opts.by(a[opts.key]);\n      const valB = opts.by(b[opts.key]);\n\n      // If both values are undefined, use the DOM order\n      if (valA === undefined && valB === undefined) {\n        revert = true;\n        return 0;\n      }\n\n      if (valA < valB || valA === 'sortFirst' || valB === 'sortLast') {\n        return -1;\n      }\n\n      if (valA > valB || valA === 'sortLast' || valB === 'sortFirst') {\n        return 1;\n      }\n\n      return 0;\n    });\n  }\n\n  // Revert to the original array if necessary\n  if (revert) {\n    return original;\n  }\n\n  if (opts.reverse) {\n    arr.reverse();\n  }\n\n  return arr;\n}\n","const transitions = {};\nconst eventName = 'transitionend';\nlet count = 0;\n\nfunction uniqueId() {\n  count += 1;\n  return eventName + count;\n}\n\nexport function cancelTransitionEnd(id) {\n  if (transitions[id]) {\n    transitions[id].element.removeEventListener(eventName, transitions[id].listener);\n    transitions[id] = null;\n    return true;\n  }\n\n  return false;\n}\n\nexport function onTransitionEnd(element, callback) {\n  const id = uniqueId();\n  const listener = (evt) => {\n    if (evt.currentTarget === evt.target) {\n      cancelTransitionEnd(id);\n      callback(evt);\n    }\n  };\n\n  element.addEventListener(eventName, listener);\n\n  transitions[id] = { element, listener };\n\n  return id;\n}\n","export default function arrayMax(array) {\n  return Math.max.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","export default function arrayMin(array) {\n  return Math.min.apply(Math, array); // eslint-disable-line prefer-spread\n}\n","import Point from './point';\nimport arrayMax from './array-max';\nimport arrayMin from './array-min';\n\n/**\n * Determine the number of columns an items spans.\n * @param {number} itemWidth Width of the item.\n * @param {number} columnWidth Width of the column (includes gutter).\n * @param {number} columns Total number of columns\n * @param {number} threshold A buffer value for the size of the column to fit.\n * @return {number}\n */\nexport function getColumnSpan(itemWidth, columnWidth, columns, threshold) {\n  let columnSpan = itemWidth / columnWidth;\n\n  // If the difference between the rounded column span number and the\n  // calculated column span number is really small, round the number to\n  // make it fit.\n  if (Math.abs(Math.round(columnSpan) - columnSpan) < threshold) {\n    // e.g. columnSpan = 4.0089945390298745\n    columnSpan = Math.round(columnSpan);\n  }\n\n  // Ensure the column span is not more than the amount of columns in the whole layout.\n  return Math.min(Math.ceil(columnSpan), columns);\n}\n\n/**\n * Retrieves the column set to use for placement.\n * @param {number} columnSpan The number of columns this current item spans.\n * @param {number} columns The total columns in the grid.\n * @return {Array.<number>} An array of numbers represeting the column set.\n */\nexport function getAvailablePositions(positions, columnSpan, columns) {\n  // The item spans only one column.\n  if (columnSpan === 1) {\n    return positions;\n  }\n\n  // The item spans more than one column, figure out how many different\n  // places it could fit horizontally.\n  // The group count is the number of places within the positions this block\n  // could fit, ignoring the current positions of items.\n  // Imagine a 2 column brick as the second item in a 4 column grid with\n  // 10px height each. Find the places it would fit:\n  // [20, 10, 10, 0]\n  //  |   |   |\n  //  *   *   *\n  //\n  // Then take the places which fit and get the bigger of the two:\n  // max([20, 10]), max([10, 10]), max([10, 0]) = [20, 10, 0]\n  //\n  // Next, find the first smallest number (the short column).\n  // [20, 10, 0]\n  //          |\n  //          *\n  //\n  // And that's where it should be placed!\n  //\n  // Another example where the second column's item extends past the first:\n  // [10, 20, 10, 0] => [20, 20, 10] => 10\n  const available = [];\n\n  // For how many possible positions for this item there are.\n  for (let i = 0; i <= columns - columnSpan; i++) {\n    // Find the bigger value for each place it could fit.\n    available.push(arrayMax(positions.slice(i, i + columnSpan)));\n  }\n\n  return available;\n}\n\n/**\n * Find index of short column, the first from the left where this item will go.\n *\n * @param {Array.<number>} positions The array to search for the smallest number.\n * @param {number} buffer Optional buffer which is very useful when the height\n *     is a percentage of the width.\n * @return {number} Index of the short column.\n */\nexport function getShortColumn(positions, buffer) {\n  const minPosition = arrayMin(positions);\n  for (let i = 0, len = positions.length; i < len; i++) {\n    if (positions[i] >= minPosition - buffer && positions[i] <= minPosition + buffer) {\n      return i;\n    }\n  }\n\n  return 0;\n}\n\n/**\n * Determine the location of the next item, based on its size.\n * @param {Object} itemSize Object with width and height.\n * @param {Array.<number>} positions Positions of the other current items.\n * @param {number} gridSize The column width or row height.\n * @param {number} total The total number of columns or rows.\n * @param {number} threshold Buffer value for the column to fit.\n * @param {number} buffer Vertical buffer for the height of items.\n * @return {Point}\n */\nexport function getItemPosition({ itemSize, positions, gridSize, total, threshold, buffer }) {\n  const span = getColumnSpan(itemSize.width, gridSize, total, threshold);\n  const setY = getAvailablePositions(positions, span, total);\n  const shortColumnIndex = getShortColumn(setY, buffer);\n\n  // Position the item\n  const point = new Point(\n    Math.round(gridSize * shortColumnIndex),\n    Math.round(setY[shortColumnIndex]));\n\n  // Update the columns array with the new values for each column.\n  // e.g. before the update the columns could be [250, 0, 0, 0] for an item\n  // which spans 2 columns. After it would be [250, itemHeight, itemHeight, 0].\n  const setHeight = setY[shortColumnIndex] + itemSize.height;\n  for (let i = 0; i < span; i++) {\n    positions[shortColumnIndex + i] = setHeight;\n  }\n\n  return point;\n}\n","import 'custom-event-polyfill';\nimport matches from 'matches-selector';\nimport arrayUnique from 'array-uniq';\nimport xtend from 'xtend';\nimport throttle from 'throttleit';\nimport parallel from 'array-parallel';\nimport Point from './point';\nimport ShuffleItem from './shuffle-item';\nimport Classes from './classes';\nimport getNumberStyle from './get-number-style';\nimport sorter from './sorter';\nimport { onTransitionEnd, cancelTransitionEnd } from './on-transition-end';\nimport { getItemPosition, getColumnSpan, getAvailablePositions, getShortColumn } from './layout';\nimport arrayMax from './array-max';\n\nfunction toArray(arrayLike) {\n  return Array.prototype.slice.call(arrayLike);\n}\n\nfunction arrayIncludes(array, obj) {\n  return array.indexOf(obj) > -1;\n}\n\n// Used for unique instance variables\nlet id = 0;\n\nclass Shuffle {\n\n  /**\n   * Categorize, sort, and filter a responsive grid of items.\n   *\n   * @param {Element} element An element which is the parent container for the grid items.\n   * @param {Object} [options=Shuffle.options] Options object.\n   * @constructor\n   */\n  constructor(element, options = {}) {\n    this.options = xtend(Shuffle.options, options);\n\n    this.useSizer = false;\n    this.lastSort = {};\n    this.group = Shuffle.ALL_ITEMS;\n    this.lastFilter = Shuffle.ALL_ITEMS;\n    this.isEnabled = true;\n    this.isDestroyed = false;\n    this.isInitialized = false;\n    this._transitions = [];\n    this.isTransitioning = false;\n    this._queue = [];\n\n    const el = this._getElementOption(element);\n\n    if (!el) {\n      throw new TypeError('Shuffle needs to be initialized with an element.');\n    }\n\n    this.element = el;\n    this.id = 'shuffle_' + id;\n    id += 1;\n\n    this._init();\n    this.isInitialized = true;\n  }\n\n  _init() {\n    this.items = this._getItems();\n\n    this.options.sizer = this._getElementOption(this.options.sizer);\n\n    if (this.options.sizer) {\n      this.useSizer = true;\n    }\n\n    // Add class and invalidate styles\n    this.element.classList.add(Shuffle.Classes.BASE);\n\n    // Set initial css for each item\n    this._initItems();\n\n    // Bind resize events\n    this._onResize = this._getResizeFunction();\n    window.addEventListener('resize', this._onResize);\n\n    // Get container css all in one request. Causes reflow\n    const containerCss = window.getComputedStyle(this.element, null);\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // Add styles to the container if it doesn't have them.\n    this._validateStyles(containerCss);\n\n    // We already got the container's width above, no need to cause another\n    // reflow getting it again... Calculate the number of columns there will be\n    this._setColumns(containerWidth);\n\n    // Kick off!\n    this.filter(this.options.group, this.options.initialSort);\n\n    // The shuffle items haven't had transitions set on them yet so the user\n    // doesn't see the first layout. Set them now that the first layout is done.\n    // First, however, a synchronous layout must be caused for the previous\n    // styles to be applied without transitions.\n    this.element.offsetWidth; // eslint-disable-line no-unused-expressions\n    this._setTransitions();\n    this.element.style.transition = 'height ' + this.options.speed + 'ms ' + this.options.easing;\n  }\n\n  /**\n   * Returns a throttled and proxied function for the resize handler.\n   * @return {Function}\n   * @private\n   */\n  _getResizeFunction() {\n    const resizeFunction = this._handleResize.bind(this);\n    return this.options.throttle ?\n        this.options.throttle(resizeFunction, this.options.throttleTime) :\n        resizeFunction;\n  }\n\n  /**\n   * Retrieve an element from an option.\n   * @param {string|jQuery|Element} option The option to check.\n   * @return {?Element} The plain element or null.\n   * @private\n   */\n  _getElementOption(option) {\n    // If column width is a string, treat is as a selector and search for the\n    // sizer element within the outermost container\n    if (typeof option === 'string') {\n      return this.element.querySelector(option);\n\n    // Check for an element\n    } else if (option && option.nodeType && option.nodeType === 1) {\n      return option;\n\n    // Check for jQuery object\n    } else if (option && option.jquery) {\n      return option[0];\n    }\n\n    return null;\n  }\n\n  /**\n   * Ensures the shuffle container has the css styles it needs applied to it.\n   * @param {Object} styles Key value pairs for position and overflow.\n   * @private\n   */\n  _validateStyles(styles) {\n    // Position cannot be static.\n    if (styles.position === 'static') {\n      this.element.style.position = 'relative';\n    }\n\n    // Overflow has to be hidden.\n    if (styles.overflow !== 'hidden') {\n      this.element.style.overflow = 'hidden';\n    }\n  }\n\n  /**\n   * Filter the elements by a category.\n   * @param {string} [category] Category to filter by. If it's given, the last\n   *     category will be used to filter the items.\n   * @param {Array} [collection] Optionally filter a collection. Defaults to\n   *     all the items.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _filter(category = this.lastFilter, collection = this.items) {\n    const set = this._getFilteredSets(category, collection);\n\n    // Individually add/remove hidden/visible classes\n    this._toggleFilterClasses(set);\n\n    // Save the last filter in case elements are appended.\n    this.lastFilter = category;\n\n    // This is saved mainly because providing a filter function (like searching)\n    // will overwrite the `lastFilter` property every time its called.\n    if (typeof category === 'string') {\n      this.group = category;\n    }\n\n    return set;\n  }\n\n  /**\n   * Returns an object containing the visible and hidden elements.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Array.<Element>} items A collection of items to filter.\n   * @return {!{visible: Array, hidden: Array}}\n   * @private\n   */\n  _getFilteredSets(category, items) {\n    let visible = [];\n    const hidden = [];\n\n    // category === 'all', add visible class to everything\n    if (category === Shuffle.ALL_ITEMS) {\n      visible = items;\n\n    // Loop through each item and use provided function to determine\n    // whether to hide it or not.\n    } else {\n      items.forEach((item) => {\n        if (this._doesPassFilter(category, item.element)) {\n          visible.push(item);\n        } else {\n          hidden.push(item);\n        }\n      });\n    }\n\n    return {\n      visible,\n      hidden,\n    };\n  }\n\n  /**\n   * Test an item to see if it passes a category.\n   * @param {string|Function} category Category or function to filter by.\n   * @param {Element} element An element to test.\n   * @return {boolean} Whether it passes the category/filter.\n   * @private\n   */\n  _doesPassFilter(category, element) {\n    if (typeof category === 'function') {\n      return category.call(element, element, this);\n    }\n\n    // Check each element's data-groups attribute against the given category.\n    const attr = element.getAttribute('data-' + Shuffle.FILTER_ATTRIBUTE_KEY);\n    const keys = this.options.delimeter ?\n          attr.split(this.options.delimeter) :\n          JSON.parse(attr);\n\n    function testCategory(category) {\n      return arrayIncludes(keys, category);\n    }\n\n    if (Array.isArray(category)) {\n      if (this.options.filterMode === Shuffle.FilterMode.ANY) {\n        return category.some(testCategory);\n      }\n      return category.every(testCategory);\n    }\n\n    return arrayIncludes(keys, category);\n  }\n\n  /**\n   * Toggles the visible and hidden class names.\n   * @param {{visible, hidden}} Object with visible and hidden arrays.\n   * @private\n   */\n  _toggleFilterClasses({ visible, hidden }) {\n    visible.forEach((item) => {\n      item.show();\n    });\n\n    hidden.forEach((item) => {\n      item.hide();\n    });\n  }\n\n  /**\n   * Set the initial css for each item\n   * @param {Array.<ShuffleItem>} [items] Optionally specifiy at set to initialize.\n   * @private\n   */\n  _initItems(items = this.items) {\n    items.forEach((item) => {\n      item.init();\n    });\n  }\n\n  /**\n   * Remove element reference and styles.\n   * @private\n   */\n  _disposeItems(items = this.items) {\n    items.forEach((item) => {\n      item.dispose();\n    });\n  }\n\n  /**\n   * Updates the visible item count.\n   * @private\n   */\n  _updateItemCount() {\n    this.visibleItems = this._getFilteredItems().length;\n  }\n\n  /**\n   * Sets css transform transition on a group of elements. This is not executed\n   * at the same time as `item.init` so that transitions don't occur upon\n   * initialization of Shuffle.\n   * @param {Array.<ShuffleItem>} items Shuffle items to set transitions on.\n   * @private\n   */\n  _setTransitions(items = this.items) {\n    const speed = this.options.speed;\n    const easing = this.options.easing;\n\n    const str = this.options.useTransforms ?\n      `transform ${speed}ms ${easing}, opacity ${speed}ms ${easing}` :\n      `top ${speed}ms ${easing}, left ${speed}ms ${easing}, opacity ${speed}ms ${easing}`;\n\n    items.forEach((item) => {\n      item.element.style.transition = str;\n    });\n  }\n\n  _getItems() {\n    return toArray(this.element.children)\n      .filter(el => matches(el, this.options.itemSelector))\n      .map(el => new ShuffleItem(el));\n  }\n\n  /**\n   * When new elements are added to the shuffle container, update the array of\n   * items because that is the order `_layout` calls them.\n   */\n  _updateItemsOrder() {\n    const children = this.element.children;\n    this.items = sorter(this.items, {\n      by(element) {\n        return Array.prototype.indexOf.call(children, element);\n      },\n    });\n  }\n\n  _getFilteredItems() {\n    return this.items.filter(item => item.isVisible);\n  }\n\n  _getConcealedItems() {\n    return this.items.filter(item => !item.isVisible);\n  }\n\n  /**\n   * Returns the column size, based on column width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @param {number} gutterSize Size of the gutters.\n   * @return {number}\n   * @private\n   */\n  _getColumnSize(containerWidth, gutterSize) {\n    let size;\n\n    // If the columnWidth property is a function, then the grid is fluid\n    if (typeof this.options.columnWidth === 'function') {\n      size = this.options.columnWidth(containerWidth);\n\n    // columnWidth option isn't a function, are they using a sizing element?\n    } else if (this.useSizer) {\n      size = Shuffle.getSize(this.options.sizer).width;\n\n    // if not, how about the explicitly set option?\n    } else if (this.options.columnWidth) {\n      size = this.options.columnWidth;\n\n    // or use the size of the first item\n    } else if (this.items.length > 0) {\n      size = Shuffle.getSize(this.items[0].element, true).width;\n\n    // if there's no items, use size of container\n    } else {\n      size = containerWidth;\n    }\n\n    // Don't let them set a column width of zero.\n    if (size === 0) {\n      size = containerWidth;\n    }\n\n    return size + gutterSize;\n  }\n\n  /**\n   * Returns the gutter size, based on gutter width and sizer options.\n   * @param {number} containerWidth Size of the parent container.\n   * @return {number}\n   * @private\n   */\n  _getGutterSize(containerWidth) {\n    let size;\n    if (typeof this.options.gutterWidth === 'function') {\n      size = this.options.gutterWidth(containerWidth);\n    } else if (this.useSizer) {\n      size = getNumberStyle(this.options.sizer, 'marginLeft');\n    } else {\n      size = this.options.gutterWidth;\n    }\n\n    return size;\n  }\n\n  /**\n   * Calculate the number of columns to be used. Gets css if using sizer element.\n   * @param {number} [containerWidth] Optionally specify a container width if\n   *    it's already available.\n   */\n  _setColumns(containerWidth = Shuffle.getSize(this.element).width) {\n    const gutter = this._getGutterSize(containerWidth);\n    const columnWidth = this._getColumnSize(containerWidth, gutter);\n    let calculatedColumns = (containerWidth + gutter) / columnWidth;\n\n    // Widths given from getStyles are not precise enough...\n    if (Math.abs(Math.round(calculatedColumns) - calculatedColumns) <\n        this.options.columnThreshold) {\n      // e.g. calculatedColumns = 11.998876\n      calculatedColumns = Math.round(calculatedColumns);\n    }\n\n    this.cols = Math.max(Math.floor(calculatedColumns), 1);\n    this.containerWidth = containerWidth;\n    this.colWidth = columnWidth;\n  }\n\n  /**\n   * Adjust the height of the grid\n   */\n  _setContainerSize() {\n    this.element.style.height = this._getContainerSize() + 'px';\n  }\n\n  /**\n   * Based on the column heights, it returns the biggest one.\n   * @return {number}\n   * @private\n   */\n  _getContainerSize() {\n    return arrayMax(this.positions);\n  }\n\n  /**\n   * Get the clamped stagger amount.\n   * @param {number} index Index of the item to be staggered.\n   * @return {number}\n   */\n  _getStaggerAmount(index) {\n    return Math.min(index * this.options.staggerAmount, this.options.staggerAmountMax);\n  }\n\n  /**\n   * @return {boolean} Whether the event was prevented or not.\n   */\n  _dispatch(name, details = {}) {\n    if (this.isDestroyed) {\n      return false;\n    }\n\n    details.shuffle = this;\n    return !this.element.dispatchEvent(new CustomEvent(name, {\n      bubbles: true,\n      cancelable: false,\n      detail: details,\n    }));\n  }\n\n  /**\n   * Zeros out the y columns array, which is used to determine item placement.\n   * @private\n   */\n  _resetCols() {\n    let i = this.cols;\n    this.positions = [];\n    while (i) {\n      i -= 1;\n      this.positions.push(0);\n    }\n  }\n\n  /**\n   * Loops through each item that should be shown and calculates the x, y position.\n   * @param {Array.<ShuffleItem>} items Array of items that will be shown/layed\n   *     out in order in their array.\n   */\n  _layout(items) {\n    let count = 0;\n    items.forEach((item) => {\n      const currPos = item.point;\n      const currScale = item.scale;\n      const itemSize = Shuffle.getSize(item.element, true);\n      const pos = this._getItemPosition(itemSize);\n\n      function callback() {\n        item.element.style.transitionDelay = '';\n        item.applyCss(ShuffleItem.Css.VISIBLE.after);\n      }\n\n      // If the item will not change its position, do not add it to the render\n      // queue. Transitions don't fire when setting a property to the same value.\n      if (Point.equals(currPos, pos) && currScale === ShuffleItem.Scale.VISIBLE) {\n        item.applyCss(ShuffleItem.Css.VISIBLE.before);\n        callback();\n        return;\n      }\n\n      item.point = pos;\n      item.scale = ShuffleItem.Scale.VISIBLE;\n\n      // Use xtend here to clone the object so that the `before` object isn't\n      // modified when the transition delay is added.\n      const styles = xtend(ShuffleItem.Css.VISIBLE.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Determine the location of the next item, based on its size.\n   * @param {{width: number, height: number}} itemSize Object with width and height.\n   * @return {Point}\n   * @private\n   */\n  _getItemPosition(itemSize) {\n    return getItemPosition({\n      itemSize,\n      positions: this.positions,\n      gridSize: this.colWidth,\n      total: this.cols,\n      threshold: this.options.columnThreshold,\n      buffer: this.options.buffer,\n    });\n  }\n\n  /**\n   * Hides the elements that don't match our filter.\n   * @param {Array.<ShuffleItem>} collection Collection to shrink.\n   * @private\n   */\n  _shrink(collection = this._getConcealedItems()) {\n    let count = 0;\n    collection.forEach((item) => {\n      function callback() {\n        item.applyCss(ShuffleItem.Css.HIDDEN.after);\n      }\n\n      // Continuing would add a transitionend event listener to the element, but\n      // that listener would not execute because the transform and opacity would\n      // stay the same.\n      // The callback is executed here because it is not guaranteed to be called\n      // after the transitionend event because the transitionend could be\n      // canceled if another animation starts.\n      if (item.scale === ShuffleItem.Scale.HIDDEN) {\n        item.applyCss(ShuffleItem.Css.HIDDEN.before);\n        callback();\n        return;\n      }\n\n      item.scale = ShuffleItem.Scale.HIDDEN;\n\n      const styles = xtend(ShuffleItem.Css.HIDDEN.before);\n      styles.transitionDelay = this._getStaggerAmount(count) + 'ms';\n\n      this._queue.push({\n        item,\n        styles,\n        callback,\n      });\n\n      count += 1;\n    });\n  }\n\n  /**\n   * Resize handler.\n   * @private\n   */\n  _handleResize() {\n    // If shuffle is disabled, destroyed, don't do anything\n    if (!this.isEnabled || this.isDestroyed) {\n      return;\n    }\n\n    // Will need to check height in the future if it's layed out horizontaly\n    const containerWidth = Shuffle.getSize(this.element).width;\n\n    // containerWidth hasn't changed, don't do anything\n    if (containerWidth === this.containerWidth) {\n      return;\n    }\n\n    this.update();\n  }\n\n  /**\n   * Returns styles which will be applied to the an item for a transition.\n   * @param {Object} obj Transition options.\n   * @return {!Object} Transforms for transitions, left/top for animate.\n   * @private\n   */\n  _getStylesForTransition({ item, styles }) {\n    if (!styles.transitionDelay) {\n      styles.transitionDelay = '0ms';\n    }\n\n    const x = item.point.x;\n    const y = item.point.y;\n\n    if (this.options.useTransforms) {\n      styles.transform = `translate(${x}px, ${y}px) scale(${item.scale})`;\n    } else {\n      styles.left = x + 'px';\n      styles.top = y + 'px';\n    }\n\n    return styles;\n  }\n\n  /**\n   * Listen for the transition end on an element and execute the itemCallback\n   * when it finishes.\n   * @param {Element} element Element to listen on.\n   * @param {Function} itemCallback Callback for the item.\n   * @param {Function} done Callback to notify `parallel` that this one is done.\n   */\n  _whenTransitionDone(element, itemCallback, done) {\n    const id = onTransitionEnd(element, (evt) => {\n      itemCallback();\n      done(null, evt);\n    });\n\n    this._transitions.push(id);\n  }\n\n  /**\n   * Return a function which will set CSS styles and call the `done` function\n   * when (if) the transition finishes.\n   * @param {Object} opts Transition object.\n   * @return {Function} A function to be called with a `done` function.\n   */\n  _getTransitionFunction(opts) {\n    return (done) => {\n      opts.item.applyCss(this._getStylesForTransition(opts));\n      this._whenTransitionDone(opts.item.element, opts.callback, done);\n    };\n  }\n\n  /**\n   * Execute the styles gathered in the style queue. This applies styles to elements,\n   * triggering transitions.\n   * @private\n   */\n  _processQueue() {\n    if (this.isTransitioning) {\n      this._cancelMovement();\n    }\n\n    const hasSpeed = this.options.speed > 0;\n    const hasQueue = this._queue.length > 0;\n\n    if (hasQueue && hasSpeed && this.isInitialized) {\n      this._startTransitions(this._queue);\n    } else if (hasQueue) {\n      this._styleImmediately(this._queue);\n      this._dispatchLayout();\n\n    // A call to layout happened, but none of the newly visible items will\n    // change position or the transition duration is zero, which will not trigger\n    // the transitionend event.\n    } else {\n      this._dispatchLayout();\n    }\n\n    // Remove everything in the style queue\n    this._queue.length = 0;\n  }\n\n  /**\n   * Wait for each transition to finish, the emit the layout event.\n   * @param {Array.<Object>} transitions Array of transition objects.\n   */\n  _startTransitions(transitions) {\n    // Set flag that shuffle is currently in motion.\n    this.isTransitioning = true;\n\n    // Create an array of functions to be called.\n    const callbacks = transitions.map(obj => this._getTransitionFunction(obj));\n\n    parallel(callbacks, this._movementFinished.bind(this));\n  }\n\n  _cancelMovement() {\n    // Remove the transition end event for each listener.\n    this._transitions.forEach(cancelTransitionEnd);\n\n    // Reset the array.\n    this._transitions.length = 0;\n\n    // Show it's no longer active.\n    this.isTransitioning = false;\n  }\n\n  /**\n   * Apply styles without a transition.\n   * @param {Array.<Object>} objects Array of transition objects.\n   * @private\n   */\n  _styleImmediately(objects) {\n    if (objects.length) {\n      const elements = objects.map(obj => obj.item.element);\n\n      Shuffle._skipTransitions(elements, () => {\n        objects.forEach((obj) => {\n          obj.item.applyCss(this._getStylesForTransition(obj));\n          obj.callback();\n        });\n      });\n    }\n  }\n\n  _movementFinished() {\n    this._transitions.length = 0;\n    this.isTransitioning = false;\n    this._dispatchLayout();\n  }\n\n  _dispatchLayout() {\n    this._dispatch(Shuffle.EventType.LAYOUT);\n  }\n\n  /**\n   * The magic. This is what makes the plugin 'shuffle'\n   * @param {string|Function|Array.<string>} [category] Category to filter by.\n   *     Can be a function, string, or array of strings.\n   * @param {Object} [sortObj] A sort object which can sort the visible set\n   */\n  filter(category, sortObj) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    if (!category || (category && category.length === 0)) {\n      category = Shuffle.ALL_ITEMS; // eslint-disable-line no-param-reassign\n    }\n\n    this._filter(category);\n\n    // Shrink each hidden item\n    this._shrink();\n\n    // How many visible elements?\n    this._updateItemCount();\n\n    // Update transforms on visible elements so they will animate to their new positions.\n    this.sort(sortObj);\n  }\n\n  /**\n   * Gets the visible elements, sorts them, and passes them to layout.\n   * @param {Object} opts the options object for the sorted plugin\n   */\n  sort(opts = this.lastSort) {\n    if (!this.isEnabled) {\n      return;\n    }\n\n    this._resetCols();\n\n    let items = this._getFilteredItems();\n    items = sorter(items, opts);\n\n    this._layout(items);\n\n    // `_layout` always happens after `_shrink`, so it's safe to process the style\n    // queue here with styles from the shrink method.\n    this._processQueue();\n\n    // Adjust the height of the container.\n    this._setContainerSize();\n\n    this.lastSort = opts;\n  }\n\n  /**\n   * Reposition everything.\n   * @param {boolean} isOnlyLayout If true, column and gutter widths won't be\n   *     recalculated.\n   */\n  update(isOnlyLayout) {\n    if (this.isEnabled) {\n      if (!isOnlyLayout) {\n        // Get updated colCount\n        this._setColumns();\n      }\n\n      // Layout items\n      this.sort();\n    }\n  }\n\n  /**\n   * Use this instead of `update()` if you don't need the columns and gutters updated\n   * Maybe an image inside `shuffle` loaded (and now has a height), which means calculations\n   * could be off.\n   */\n  layout() {\n    this.update(true);\n  }\n\n  /**\n   * New items have been appended to shuffle. Mix them in with the current\n   * filter or sort status.\n   * @param {Array.<Element>} newItems Collection of new items.\n   */\n  add(newItems) {\n    const items = arrayUnique(newItems).map(el => new ShuffleItem(el));\n\n    // Add classes and set initial positions.\n    this._initItems(items);\n\n    // Add transition to each item.\n    this._setTransitions(items);\n\n    // Update the list of items.\n    this.items = this.items.concat(items);\n    this._updateItemsOrder();\n    this.filter(this.lastFilter);\n  }\n\n  /**\n   * Disables shuffle from updating dimensions and layout on resize\n   */\n  disable() {\n    this.isEnabled = false;\n  }\n\n  /**\n   * Enables shuffle again\n   * @param {boolean} [isUpdateLayout=true] if undefined, shuffle will update columns and gutters\n   */\n  enable(isUpdateLayout) {\n    this.isEnabled = true;\n    if (isUpdateLayout !== false) {\n      this.update();\n    }\n  }\n\n  /**\n   * Remove 1 or more shuffle items\n   * @param {Array.<Element>} elements An array containing one or more\n   *     elements in shuffle\n   * @return {Shuffle} The shuffle object\n   */\n  remove(elements) {\n    if (!elements.length) {\n      return;\n    }\n\n    const collection = arrayUnique(elements);\n\n    const oldItems = collection\n      .map(element => this.getItemByElement(element))\n      .filter(item => !!item);\n\n    const handleLayout = () => {\n      this.element.removeEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n      this._disposeItems(oldItems);\n\n      // Remove the collection in the callback\n      collection.forEach((element) => {\n        element.parentNode.removeChild(element);\n      });\n\n      this._dispatch(Shuffle.EventType.REMOVED, { collection });\n    };\n\n    // Hide collection first.\n    this._toggleFilterClasses({\n      visible: [],\n      hidden: oldItems,\n    });\n\n    this._shrink(oldItems);\n\n    this.sort();\n\n    // Update the list of items here because `remove` could be called again\n    // with an item that is in the process of being removed.\n    this.items = this.items.filter(item => !arrayIncludes(oldItems, item));\n    this._updateItemCount();\n\n    this.element.addEventListener(Shuffle.EventType.LAYOUT, handleLayout);\n  }\n\n  /**\n   * Retrieve a shuffle item by its element.\n   * @param {Element} element Element to look for.\n   * @return {?ShuffleItem} A shuffle item or null if it's not found.\n   */\n  getItemByElement(element) {\n    for (let i = this.items.length - 1; i >= 0; i--) {\n      if (this.items[i].element === element) {\n        return this.items[i];\n      }\n    }\n\n    return null;\n  }\n\n  /**\n   * Destroys shuffle, removes events, styles, and classes\n   */\n  destroy() {\n    this._cancelMovement();\n    window.removeEventListener('resize', this._onResize);\n\n    // Reset container styles\n    this.element.classList.remove('shuffle');\n    this.element.removeAttribute('style');\n\n    // Reset individual item styles\n    this._disposeItems();\n\n    // Null DOM references\n    this.items = null;\n    this.options.sizer = null;\n    this.element = null;\n    this._transitions = null;\n\n    // Set a flag so if a debounced resize has been triggered,\n    // it can first check if it is actually isDestroyed and not doing anything\n    this.isDestroyed = true;\n  }\n\n  /**\n   * Returns the outer width of an element, optionally including its margins.\n   *\n   * There are a few different methods for getting the width of an element, none of\n   * which work perfectly for all Shuffle's use cases.\n   *\n   * 1. getBoundingClientRect() `left` and `right` properties.\n   *   - Accounts for transform scaled elements, making it useless for Shuffle\n   *   elements which have shrunk.\n   * 2. The `offsetWidth` property.\n   *   - This value stays the same regardless of the elements transform property,\n   *   however, it does not return subpixel values.\n   * 3. getComputedStyle()\n   *   - This works great Chrome, Firefox, Safari, but IE<=11 does not include\n   *   padding and border when box-sizing: border-box is set, requiring a feature\n   *   test and extra work to add the padding back for IE and other browsers which\n   *   follow the W3C spec here.\n   *\n   * @param {Element} element The element.\n   * @param {boolean} [includeMargins] Whether to include margins. Default is false.\n   * @return {{width: number, height: number}} The width and height.\n   */\n  static getSize(element, includeMargins) {\n    // Store the styles so that they can be used by others without asking for it again.\n    const styles = window.getComputedStyle(element, null);\n    let width = getNumberStyle(element, 'width', styles);\n    let height = getNumberStyle(element, 'height', styles);\n\n    if (includeMargins) {\n      const marginLeft = getNumberStyle(element, 'marginLeft', styles);\n      const marginRight = getNumberStyle(element, 'marginRight', styles);\n      const marginTop = getNumberStyle(element, 'marginTop', styles);\n      const marginBottom = getNumberStyle(element, 'marginBottom', styles);\n      width += marginLeft + marginRight;\n      height += marginTop + marginBottom;\n    }\n\n    return {\n      width,\n      height,\n    };\n  }\n\n  /**\n   * Change a property or execute a function which will not have a transition\n   * @param {Array.<Element>} elements DOM elements that won't be transitioned.\n   * @param {Function} callback A function which will be called while transition\n   *     is set to 0ms.\n   * @private\n   */\n  static _skipTransitions(elements, callback) {\n    const zero = '0ms';\n\n    // Save current duration and delay.\n    const data = elements.map((element) => {\n      const style = element.style;\n      const duration = style.transitionDuration;\n      const delay = style.transitionDelay;\n\n      // Set the duration to zero so it happens immediately\n      style.transitionDuration = zero;\n      style.transitionDelay = zero;\n\n      return {\n        duration,\n        delay,\n      };\n    });\n\n    callback();\n\n    // Cause reflow.\n    elements[0].offsetWidth; // eslint-disable-line no-unused-expressions\n\n    // Put the duration back\n    elements.forEach((element, i) => {\n      element.style.transitionDuration = data[i].duration;\n      element.style.transitionDelay = data[i].delay;\n    });\n  }\n}\n\nShuffle.ShuffleItem = ShuffleItem;\n\nShuffle.ALL_ITEMS = 'all';\nShuffle.FILTER_ATTRIBUTE_KEY = 'groups';\n\n/**\n * @enum {string}\n */\nShuffle.EventType = {\n  LAYOUT: 'shuffle:layout',\n  REMOVED: 'shuffle:removed',\n};\n\n/** @enum {string} */\nShuffle.Classes = Classes;\n\n/**\n * @enum {string}\n */\nShuffle.FilterMode = {\n  ANY: 'any',\n  ALL: 'all',\n};\n\n// Overrideable options\nShuffle.options = {\n  // Initial filter group.\n  group: Shuffle.ALL_ITEMS,\n\n  // Transition/animation speed (milliseconds).\n  speed: 250,\n\n  // CSS easing function to use.\n  easing: 'ease',\n\n  // e.g. '.picture-item'.\n  itemSelector: '*',\n\n  // Element or selector string. Use an element to determine the size of columns\n  // and gutters.\n  sizer: null,\n\n  // A static number or function that tells the plugin how wide the gutters\n  // between columns are (in pixels).\n  gutterWidth: 0,\n\n  // A static number or function that returns a number which tells the plugin\n  // how wide the columns are (in pixels).\n  columnWidth: 0,\n\n  // If your group is not json, and is comma delimeted, you could set delimeter\n  // to ','.\n  delimeter: null,\n\n  // Useful for percentage based heights when they might not always be exactly\n  // the same (in pixels).\n  buffer: 0,\n\n  // Reading the width of elements isn't precise enough and can cause columns to\n  // jump between values.\n  columnThreshold: 0.01,\n\n  // Shuffle can be isInitialized with a sort object. It is the same object\n  // given to the sort method.\n  initialSort: null,\n\n  // By default, shuffle will throttle resize events. This can be changed or\n  // removed.\n  throttle,\n\n  // How often shuffle can be called on resize (in milliseconds).\n  throttleTime: 300,\n\n  // Transition delay offset for each item in milliseconds.\n  staggerAmount: 15,\n\n  // Maximum stagger delay in milliseconds.\n  staggerAmountMax: 250,\n\n  // Whether to use transforms or absolute positioning.\n  useTransforms: true,\n\n  // Affects using an array with filter. e.g. `filter(['one', 'two'])`. With \"any\",\n  // the element passes the test if any of its groups are in the array. With \"all\",\n  // the element only passes if all groups are in the array.\n  filterMode: Shuffle.FilterMode.ANY,\n};\n\n// Expose for testing. 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\ No newline at end of file
diff --git a/src/shuffle.js b/src/shuffle.js
index e3d21a7..7d303a8 100644
--- a/src/shuffle.js
+++ b/src/shuffle.js
@@ -18,11 +18,7 @@ function toArray(arrayLike) {
 }
 
 function arrayIncludes(array, obj) {
-  if (arguments.length === 2) {
-    return arrayIncludes(array)(obj);
-  }
-
-  return obj => array.indexOf(obj) > -1;
+  return array.indexOf(obj) > -1;
 }
 
 // Used for unique instance variables
@@ -230,19 +226,23 @@ class Shuffle {
   _doesPassFilter(category, element) {
     if (typeof category === 'function') {
       return category.call(element, element, this);
+    }
 
     // Check each element's data-groups attribute against the given category.
-    }
     const attr = element.getAttribute('data-' + Shuffle.FILTER_ATTRIBUTE_KEY);
     const keys = this.options.delimeter ?
           attr.split(this.options.delimeter) :
           JSON.parse(attr);
 
+    function testCategory(category) {
+      return arrayIncludes(keys, category);
+    }
+
     if (Array.isArray(category)) {
-      if (this.options.filterMode !== Shuffle.filterMode.EXCLUSIVE) {
-        return category.every(arrayIncludes(keys));
+      if (this.options.filterMode === Shuffle.FilterMode.ANY) {
+        return category.some(testCategory);
       }
-      return category.some(arrayIncludes(keys));
+      return category.every(testCategory);
     }
 
     return arrayIncludes(keys, category);
@@ -1035,9 +1035,9 @@ Shuffle.Classes = Classes;
 /**
  * @enum {string}
  */
-Shuffle.filterMode = {
-  EXCLUSIVE: 'exclusive',
-  ADDITIVE: 'additive',
+Shuffle.FilterMode = {
+  ANY: 'any',
+  ALL: 'all',
 };
 
 // Overrideable options
@@ -1098,8 +1098,10 @@ Shuffle.options = {
   // Whether to use transforms or absolute positioning.
   useTransforms: true,
 
-  // Filters elements with "some" when 'exclusive' and with every on 'additive'
-  filterMode: Shuffle.filterMode.EXCLUSIVE,
+  // Affects using an array with filter. e.g. `filter(['one', 'two'])`. With "any",
+  // the element passes the test if any of its groups are in the array. With "all",
+  // the element only passes if all groups are in the array.
+  filterMode: Shuffle.FilterMode.ANY,
 };
 
 // Expose for testing. Hack at your own risk.
diff --git a/test/test.js b/test/test.js
index 27c4cdd..ea2c23e 100644
--- a/test/test.js
+++ b/test/test.js
@@ -346,6 +346,17 @@ describe('shuffle', function () {
       expect(instance._doesPassFilter(function (element) {
         return element.getAttribute('data-age') === '22';
       }, first)).to.equal(false);
+
+      // Arrays.
+      expect(instance._doesPassFilter(['design'], first)).to.be.true;
+      expect(instance._doesPassFilter(['red'], first)).to.be.true;
+      expect(instance._doesPassFilter(['design', 'black'], first)).to.be.true;
+
+      // Change filter mode.
+      instance.options.filterMode = Shuffle.FilterMode.ALL;
+      expect(instance._doesPassFilter(['design'], first)).to.be.true;
+      expect(instance._doesPassFilter(['design', 'red'], first)).to.be.true;
+      expect(instance._doesPassFilter(['design', 'black'], first)).to.be.false;
     });
 
     it('will maintain the last sort object', function () {