diff --git a/dist/shuffle.js b/dist/shuffle.js
index de69b3b..41fd4b0 100644
--- a/dist/shuffle.js
+++ b/dist/shuffle.js
@@ -965,7 +965,11 @@ var Shuffle = function () {
       var keys = this.options.delimeter ? attr.split(this.options.delimeter) : JSON.parse(attr);
 
       if (Array.isArray(category)) {
-        return category.some(arrayIncludes(keys));
+        if (this.options.filterMode != Shuffle.filterMode.EXCLUSIVE) {
+          return category.every(arrayIncludes(keys));
+        } else {
+          return category.some(arrayIncludes(keys));
+        }
       }
 
       return arrayIncludes(keys, category);
@@ -1918,6 +1922,14 @@ Shuffle.EventType = {
 /** @enum {string} */
 Shuffle.Classes = Classes;
 
+/**
+ * @enum {string}
+ */
+Shuffle.filterMode = {
+  EXCLUSIVE: 'exclusive',
+  ADDITIVE: 'additive'
+};
+
 // Overrideable options
 Shuffle.options = {
   // Initial filter group.
@@ -1974,7 +1986,10 @@ Shuffle.options = {
   staggerAmountMax: 250,
 
   // Whether to use transforms or absolute positioning.
-  useTransforms: true
+  useTransforms: true,
+
+  // Filters elements with "some" when 'exclusive' and with every on 'additive'
+  filterMode: Shuffle.filterMode.EXCLUSIVE
 };
 
 // Expose for testing. Hack at your own risk.
diff --git a/dist/shuffle.js.map b/dist/shuffle.js.map
index a4d7812..75c0c11 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      return category.some(arrayIncludes(keys));\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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+{"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. 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 5cfaf56..8ab6535 100644
--- a/dist/shuffle.min.js
+++ b/dist/shuffle.min.js
@@ -1,2 +1,2 @@
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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 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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,V=function(){function t(e){z(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}();V.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"}}},V.Scale={VISIBLE:1,HIDDEN:.001};var B=document.body||document.documentElement,O=document.createElement("div");O.style.cssText="width:10px;padding:2px;box-sizing:border-box;",B.appendChild(O);var W=window.getComputedStyle(O,null).width,N="10px"===W;B.removeChild(O);var R={reverse:!1,by:null,randomize:!1,key:"element"},H={},q="transitionend",P=0,U=0,j=function(){function t(e){var i=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};z(this,t),this.options=L(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){if("function"==typeof e)return e.call(i,i,this);var n=i.getAttribute("data-"+t.FILTER_ATTRIBUTE_KEY),s=this.options.delimeter?n.split(this.options.delimeter):JSON.parse(n);return Array.isArray(e)?this.options.filterMode!=t.filterMode.EXCLUSIVE?e.every(g(s)):e.some(g(s)):g(s,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 b(e,t.options.itemSelector)}).map(function(t){return new V(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(V.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===V.Scale.VISIBLE)return e.applyCss(V.Css.VISIBLE.before),void s();e.point=a,e.scale=V.Scale.VISIBLE;var u=L(V.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(V.Css.HIDDEN.after)}if(e.scale===V.Scale.HIDDEN)return e.applyCss(V.Css.HIDDEN.before),void n();e.scale=V.Scale.HIDDEN;var s=L(V.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)});D(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 V(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 j.ShuffleItem=V,j.ALL_ITEMS="all",j.FILTER_ATTRIBUTE_KEY="groups",j.EventType={LAYOUT:"shuffle:layout",REMOVED:"shuffle:removed"},j.Classes=F,j.filterMode={EXCLUSIVE:"exclusive",ADDITIVE:"additive"},j.options={group:j.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:j.filterMode.EXCLUSIVE},j.__Point=A,j.__sorter=l,j.__getColumnSpan=d,j.__getAvailablePositions=m,j.__getShortColumn=v,j});
 //# sourceMappingURL=shuffle.min.js.map
diff --git a/dist/shuffle.min.js.map b/dist/shuffle.min.js.map
index f992e85..25a2331 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      return category.some(arrayIncludes(keys));\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// 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\n// Expose for testing. 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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  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
diff --git a/src/shuffle.js b/src/shuffle.js
index d019975..e3d21a7 100644
--- a/src/shuffle.js
+++ b/src/shuffle.js
@@ -239,6 +239,9 @@ class Shuffle {
           JSON.parse(attr);
 
     if (Array.isArray(category)) {
+      if (this.options.filterMode !== Shuffle.filterMode.EXCLUSIVE) {
+        return category.every(arrayIncludes(keys));
+      }
       return category.some(arrayIncludes(keys));
     }
 
@@ -1029,6 +1032,14 @@ Shuffle.EventType = {
 /** @enum {string} */
 Shuffle.Classes = Classes;
 
+/**
+ * @enum {string}
+ */
+Shuffle.filterMode = {
+  EXCLUSIVE: 'exclusive',
+  ADDITIVE: 'additive',
+};
+
 // Overrideable options
 Shuffle.options = {
   // Initial filter group.
@@ -1086,6 +1097,9 @@ 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,
 };
 
 // Expose for testing. Hack at your own risk.