/**
+ * @author Jacky Nguyen <jacky@sencha.com>
+ * @docauthor Jacky Nguyen <jacky@sencha.com>
+ * @class Ext.Array
+ *
+ * A set of useful static methods to deal with arrays; provide missing methods for older browsers.
+
+ * @singleton
+ * @markdown
+ */
+(function() {
+
+ var arrayPrototype = Array.prototype,
+ slice = arrayPrototype.slice,
+ supportsForEach = 'forEach' in arrayPrototype,
+ supportsMap = 'map' in arrayPrototype,
+ supportsIndexOf = 'indexOf' in arrayPrototype,
+ supportsEvery = 'every' in arrayPrototype,
+ supportsSome = 'some' in arrayPrototype,
+ supportsFilter = 'filter' in arrayPrototype,
+ supportsSort = function() {
+ var a = [1,2,3,4,5].sort(function(){ return 0; });
+ return a[0] === 1 && a[1] === 2 && a[2] === 3 && a[3] === 4 && a[4] === 5;
+ }(),
+ supportsSliceOnNodeList = true,
+ ExtArray;
+ try {
+ // IE 6 - 8 will throw an error when using Array.prototype.slice on NodeList
+ if (typeof document !== 'undefined') {
+ slice.call(document.getElementsByTagName('body'));
+ }
+ } catch (e) {
+ supportsSliceOnNodeList = false;
+ }
+
+ ExtArray = Ext.Array = {
+ /*
+ * Iterates an array or an iterable value and invoke the given callback function for each item.
+
+ var countries = ['Vietnam', 'Singapore', 'United States', 'Russia'];
+
+ Ext.Array.each(countries, function(name, index, countriesItSelf) {
+ console.log(name);
+ });
+
+ var sum = function() {
+ var sum = 0;
+
+ Ext.Array.each(arguments, function(value) {
+ sum += value;
+ });
+
+ return sum;
+ };
+
+ sum(1, 2, 3); // returns 6
+
+ * The iteration can be stopped by returning false in the function callback.
+
+ Ext.Array.each(countries, function(name, index, countriesItSelf) {
+ if (name === 'Singapore') {
+ return false; // break here
+ }
+ });
+
+ * @param {Array/NodeList/Mixed} iterable The value to be iterated. If this
+ * argument is not iterable, the callback function is called once.
+ * @param {Function} fn The callback function. If it returns false, the iteration stops and this method returns
+ * the current `index`. Arguments passed to this callback function are:
+
+- `item`: {Mixed} The item at the current `index` in the passed `array`
+- `index`: {Number} The current `index` within the `array`
+- `allItems`: {Array/NodeList/Mixed} The `array` passed as the first argument to `Ext.Array.each`
+
+ * @param {Object} scope (Optional) The scope (`this` reference) in which the specified function is executed.
+ * @param {Boolean} reverse (Optional) Reverse the iteration order (loop from the end to the beginning)
+ * Defaults false
+ * @return {Boolean} See description for the `fn` parameter.
+ * @markdown
+ */
+ each: function(array, fn, scope, reverse) {
+ array = ExtArray.from(array);
+
+ var i,
+ ln = array.length;
+
+ if (reverse !== true) {
+ for (i = 0; i < ln; i++) {
+ if (fn.call(scope || array[i], array[i], i, array) === false) {
+ return i;
+ }
+ }
+ }
+ else {
+ for (i = ln - 1; i > -1; i--) {
+ if (fn.call(scope || array[i], array[i], i, array) === false) {
+ return i;
+ }
+ }
+ }
+
+ return true;
+ },
+
+ /**
+ * Iterates an array and invoke the given callback function for each item. Note that this will simply
+ * delegate to the native Array.prototype.forEach method if supported.
+ * It doesn't support stopping the iteration by returning false in the callback function like
+ * {@link Ext.Array#each}. However, performance could be much better in modern browsers comparing with
+ * {@link Ext.Array#each}
+ *
+ * @param {Array} array The array to iterate
+ * @param {Function} fn The function callback, to be invoked these arguments:
+ *
+- `item`: {Mixed} The item at the current `index` in the passed `array`
+- `index`: {Number} The current `index` within the `array`
+- `allItems`: {Array} The `array` itself which was passed as the first argument
+
+ * @param {Object} scope (Optional) The execution scope (`this`) in which the specified function is executed.
+ * @markdown
+ */
+ forEach: function(array, fn, scope) {
+ if (supportsForEach) {
+ return array.forEach(fn, scope);
+ }
+
+ var i = 0,
+ ln = array.length;
+
+ for (; i < ln; i++) {
+ fn.call(scope, array[i], i, array);
+ }
+ },
+
+ /**
+ * Get the index of the provided `item` in the given `array`, a supplement for the
+ * missing arrayPrototype.indexOf in Internet Explorer.
+ *
+ * @param {Array} array The array to check
+ * @param {Mixed} item The item to look for
+ * @param {Number} from (Optional) The index at which to begin the search
+ * @return {Number} The index of item in the array (or -1 if it is not found)
+ * @markdown
+ */
+ indexOf: function(array, item, from) {
+ if (supportsIndexOf) {
+ return array.indexOf(item, from);
+ }
+
+ var i, length = array.length;
+
+ for (i = (from < 0) ? Math.max(0, length + from) : from || 0; i < length; i++) {
+ if (array[i] === item) {
+ return i;
+ }
+ }
+
+ return -1;
+ },
+
+ /**
+ * Checks whether or not the given `array` contains the specified `item`
+ *
+ * @param {Array} array The array to check
+ * @param {Mixed} item The item to look for
+ * @return {Boolean} True if the array contains the item, false otherwise
+ * @markdown
+ */
+ contains: function(array, item) {
+ if (supportsIndexOf) {
+ return array.indexOf(item) !== -1;
+ }
+
+ var i, ln;
+
+ for (i = 0, ln = array.length; i < ln; i++) {
+ if (array[i] === item) {
+ return true;
+ }
+ }
+
+ return false;
+ },
+
+ /**
+ * Converts any iterable (numeric indices and a length property) into a true array.
+
+function test() {
+ var args = Ext.Array.toArray(arguments),
+ fromSecondToLastArgs = Ext.Array.toArray(arguments, 1);
+
+ alert(args.join(' '));
+ alert(fromSecondToLastArgs.join(' '));
+}
+
+test('just', 'testing', 'here'); // alerts 'just testing here';
+ // alerts 'testing here';
+
+Ext.Array.toArray(document.getElementsByTagName('div')); // will convert the NodeList into an array
+Ext.Array.toArray('splitted'); // returns ['s', 'p', 'l', 'i', 't', 't', 'e', 'd']
+Ext.Array.toArray('splitted', 0, 3); // returns ['s', 'p', 'l', 'i']
+
+ * @param {Mixed} iterable the iterable object to be turned into a true Array.
+ * @param {Number} start (Optional) a zero-based index that specifies the start of extraction. Defaults to 0
+ * @param {Number} end (Optional) a zero-based index that specifies the end of extraction. Defaults to the last
+ * index of the iterable value
+ * @return {Array} array
+ * @markdown
+ */
+ toArray: function(iterable, start, end){
+ if (!iterable || !iterable.length) {
+ return [];
+ }
+
+ if (typeof iterable === 'string') {
+ iterable = iterable.split('');
+ }
+
+ if (supportsSliceOnNodeList) {
+ return slice.call(iterable, start || 0, end || iterable.length);
+ }
+
+ var array = [],
+ i;
+
+ start = start || 0;
+ end = end ? ((end < 0) ? iterable.length + end : end) : iterable.length;
+
+ for (i = start; i < end; i++) {
+ array.push(iterable[i]);
+ }
+
+ return array;
+ },
+
+ /**
+ * Plucks the value of a property from each item in the Array. Example:
+ *
+ Ext.Array.pluck(Ext.query("p"), "className"); // [el1.className, el2.className, ..., elN.className]
+
+ * @param {Array|NodeList} array The Array of items to pluck the value from.
+ * @param {String} propertyName The property name to pluck from each element.
+ * @return {Array} The value from each item in the Array.
+ */
+ pluck: function(array, propertyName) {
+ var ret = [],
+ i, ln, item;
+
+ for (i = 0, ln = array.length; i < ln; i++) {
+ item = array[i];
+
+ ret.push(item[propertyName]);
+ }
+
+ return ret;
+ },
+
+ /**
+ * Creates a new array with the results of calling a provided function on every element in this array.
+ * @param {Array} array
+ * @param {Function} fn Callback function for each item
+ * @param {Object} scope Callback function scope
+ * @return {Array} results
+ */
+ map: function(array, fn, scope) {
+ if (supportsMap) {
+ return array.map(fn, scope);
+ }
+
+ var results = [],
+ i = 0,
+ len = array.length;
+
+ for (; i < len; i++) {
+ results[i] = fn.call(scope, array[i], i, array);
+ }
+
+ return results;
+ },
+
+ /**
+ * Executes the specified function for each array element until the function returns a falsy value.
+ * If such an item is found, the function will return false immediately.
+ * Otherwise, it will return true.
+ *
+ * @param {Array} array
+ * @param {Function} fn Callback function for each item
+ * @param {Object} scope Callback function scope
+ * @return {Boolean} True if no false value is returned by the callback function.
+ */
+ every: function(array, fn, scope) {
+ //<debug>
+ if (!fn) {
+ Ext.Error.raise('Ext.Array.every must have a callback function passed as second argument.');
+ }
+ //</debug>
+ if (supportsEvery) {
+ return array.every(fn, scope);
+ }
+
+ var i = 0,
+ ln = array.length;
+
+ for (; i < ln; ++i) {
+ if (!fn.call(scope, array[i], i, array)) {
+ return false;
+ }
+ }
+
+ return true;
+ },
+
+ /**
+ * Executes the specified function for each array element until the function returns a truthy value.
+ * If such an item is found, the function will return true immediately. Otherwise, it will return false.
+ *
+ * @param {Array} array
+ * @param {Function} fn Callback function for each item
+ * @param {Object} scope Callback function scope
+ * @return {Boolean} True if the callback function returns a truthy value.
+ */
+ some: function(array, fn, scope) {
+ //<debug>
+ if (!fn) {
+ Ext.Error.raise('Ext.Array.some must have a callback function passed as second argument.');
+ }
+ //</debug>
+ if (supportsSome) {
+ return array.some(fn, scope);
+ }
+
+ var i = 0,
+ ln = array.length;
+
+ for (; i < ln; ++i) {
+ if (fn.call(scope, array[i], i, array)) {
+ return true;
+ }
+ }
+
+ return false;
+ },
+
+ /**
+ * Filter through an array and remove empty item as defined in {@link Ext#isEmpty Ext.isEmpty}
+ *
+ * @see Ext.Array.filter
+ * @param {Array} array
+ * @return {Array} results
+ */
+ clean: function(array) {
+ var results = [],
+ i = 0,
+ ln = array.length,
+ item;
+
+ for (; i < ln; i++) {
+ item = array[i];
+
+ if (!Ext.isEmpty(item)) {
+ results.push(item);
+ }
+ }
+
+ return results;
+ },
+
+ /**
+ * Returns a new array with unique items
+ *
+ * @param {Array} array
+ * @return {Array} results
+ */
+ unique: function(array) {
+ var clone = [],
+ i = 0,
+ ln = array.length,
+ item;
+
+ for (; i < ln; i++) {
+ item = array[i];
+
+ if (ExtArray.indexOf(clone, item) === -1) {
+ clone.push(item);
+ }
+ }
+
+ return clone;
+ },
+
+ /**
+ * Creates a new array with all of the elements of this array for which
+ * the provided filtering function returns true.
+ * @param {Array} array
+ * @param {Function} fn Callback function for each item
+ * @param {Object} scope Callback function scope
+ * @return {Array} results
+ */
+ filter: function(array, fn, scope) {
+ if (supportsFilter) {
+ return array.filter(fn, scope);
+ }
+
+ var results = [],
+ i = 0,
+ ln = array.length;
+
+ for (; i < ln; i++) {
+ if (fn.call(scope, array[i], i, array)) {
+ results.push(array[i]);
+ }
+ }
+
+ return results;
+ },
+
+ /**
+ * Converts a value to an array if it's not already an array; returns:
+ *
+ * - An empty array if given value is `undefined` or `null`
+ * - Itself if given value is already an array
+ * - An array copy if given value is {@link Ext#isIterable iterable} (arguments, NodeList and alike)
+ * - An array with one item which is the given value, otherwise
+ *
+ * @param {Array/Mixed} value The value to convert to an array if it's not already is an array
+ * @param {Boolean} (Optional) newReference True to clone the given array and return a new reference if necessary,
+ * defaults to false
+ * @return {Array} array
+ * @markdown
+ */
+ from: function(value, newReference) {
+ if (value === undefined || value === null) {
+ return [];
+ }
+
+ if (Ext.isArray(value)) {
+ return (newReference) ? slice.call(value) : value;
+ }
+
+ if (value && value.length !== undefined && typeof value !== 'string') {
+ return Ext.toArray(value);
+ }
+
+ return [value];
+ },
+
+ /**
+ * Removes the specified item from the array if it exists
+ *
+ * @param {Array} array The array
+ * @param {Mixed} item The item to remove
+ * @return {Array} The passed array itself
+ */
+ remove: function(array, item) {
+ var index = ExtArray.indexOf(array, item);
+
+ if (index !== -1) {
+ array.splice(index, 1);
+ }
+
+ return array;
+ },
+
+ /**
+ * Push an item into the array only if the array doesn't contain it yet
+ *
+ * @param {Array} array The array
+ * @param {Mixed} item The item to include
+ * @return {Array} The passed array itself
+ */
+ include: function(array, item) {
+ if (!ExtArray.contains(array, item)) {
+ array.push(item);
+ }
+ },
+
+ /**
+ * Clone a flat array without referencing the previous one. Note that this is different
+ * from Ext.clone since it doesn't handle recursive cloning. It's simply a convenient, easy-to-remember method
+ * for Array.prototype.slice.call(array)
+ *
+ * @param {Array} array The array
+ * @return {Array} The clone array
+ */
+ clone: function(array) {
+ return slice.call(array);
+ },
+
+ /**
+ * Merge multiple arrays into one with unique items. Alias to {@link Ext.Array#union}.
+ *
+ * @param {Array} array,...
+ * @return {Array} merged
+ */
+ merge: function() {
+ var args = slice.call(arguments),
+ array = [],
+ i, ln;
+
+ for (i = 0, ln = args.length; i < ln; i++) {
+ array = array.concat(args[i]);
+ }
+
+ return ExtArray.unique(array);
+ },
+
+ /**
+ * Merge multiple arrays into one with unique items that exist in all of the arrays.
+ *
+ * @param {Array} array,...
+ * @return {Array} intersect
+ */
+ intersect: function() {
+ var intersect = [],
+ arrays = slice.call(arguments),
+ i, j, k, minArray, array, x, y, ln, arraysLn, arrayLn;
+
+ if (!arrays.length) {
+ return intersect;
+ }
+
+ // Find the smallest array
+ for (i = x = 0,ln = arrays.length; i < ln,array = arrays[i]; i++) {
+ if (!minArray || array.length < minArray.length) {
+ minArray = array;
+ x = i;
+ }
+ }
+
+ minArray = Ext.Array.unique(minArray);
+ arrays.splice(x, 1);
+
+ // Use the smallest unique'd array as the anchor loop. If the other array(s) do contain
+ // an item in the small array, we're likely to find it before reaching the end
+ // of the inner loop and can terminate the search early.
+ for (i = 0,ln = minArray.length; i < ln,x = minArray[i]; i++) {
+ var count = 0;
+
+ for (j = 0,arraysLn = arrays.length; j < arraysLn,array = arrays[j]; j++) {
+ for (k = 0,arrayLn = array.length; k < arrayLn,y = array[k]; k++) {
+ if (x === y) {
+ count++;
+ break;
+ }
+ }
+ }
+
+ if (count === arraysLn) {
+ intersect.push(x);
+ }
+ }
+
+ return intersect;
+ },
+
+ /**
+ * Perform a set difference A-B by subtracting all items in array B from array A.
+ *
+ * @param {Array} array A
+ * @param {Array} array B
+ * @return {Array} difference
+ */
+ difference: function(arrayA, arrayB) {
+ var clone = slice.call(arrayA),
+ ln = clone.length,
+ i, j, lnB;
+
+ for (i = 0,lnB = arrayB.length; i < lnB; i++) {
+ for (j = 0; j < ln; j++) {
+ if (clone[j] === arrayB[i]) {
+ clone.splice(j, 1);
+ j--;
+ ln--;
+ }
+ }
+ }
+
+ return clone;
+ },
+
+ /**
+ * Sorts the elements of an Array.
+ * By default, this method sorts the elements alphabetically and ascending.
+ *
+ * @param {Array} array The array to sort.
+ * @param {Function} sortFn (optional) The comparison function.
+ * @return {Array} The sorted array.
+ */
+ sort: function(array, sortFn) {
+ if (supportsSort) {
+ if (sortFn) {
+ return array.sort(sortFn);
+ } else {
+ return array.sort();
+ }
+ }
+
+ var length = array.length,
+ i = 0,
+ comparison,
+ j, min, tmp;
+
+ for (; i < length; i++) {
+ min = i;
+ for (j = i + 1; j < length; j++) {
+ if (sortFn) {
+ comparison = sortFn(array[j], array[min]);
+ if (comparison < 0) {
+ min = j;
+ }
+ } else if (array[j] < array[min]) {
+ min = j;
+ }
+ }
+ if (min !== i) {
+ tmp = array[i];
+ array[i] = array[min];
+ array[min] = tmp;
+ }
+ }
+
+ return array;
+ },
+
+ /**
+ * Recursively flattens into 1-d Array. Injects Arrays inline.
+ * @param {Array} array The array to flatten
+ * @return {Array} The new, flattened array.
+ */
+ flatten: function(array) {
+ var worker = [];
+
+ function rFlatten(a) {
+ var i, ln, v;
+
+ for (i = 0, ln = a.length; i < ln; i++) {
+ v = a[i];
+
+ if (Ext.isArray(v)) {
+ rFlatten(v);
+ } else {
+ worker.push(v);
+ }
+ }
+
+ return worker;
+ }
+
+ return rFlatten(array);
+ },
+
+ /**
+ * Returns the minimum value in the Array.
+ * @param {Array|NodeList} array The Array from which to select the minimum value.
+ * @param {Function} comparisonFn (optional) a function to perform the comparision which determines minimization.
+ * If omitted the "<" operator will be used. Note: gt = 1; eq = 0; lt = -1
+ * @return {Mixed} minValue The minimum value
+ */
+ min: function(array, comparisonFn) {
+ var min = array[0],
+ i, ln, item;
+
+ for (i = 0, ln = array.length; i < ln; i++) {
+ item = array[i];
+
+ if (comparisonFn) {
+ if (comparisonFn(min, item) === 1) {
+ min = item;
+ }
+ }
+ else {
+ if (item < min) {
+ min = item;
+ }
+ }
+ }
+
+ return min;
+ },
+
+ /**
+ * Returns the maximum value in the Array
+ * @param {Array|NodeList} array The Array from which to select the maximum value.
+ * @param {Function} comparisonFn (optional) a function to perform the comparision which determines maximization.
+ * If omitted the ">" operator will be used. Note: gt = 1; eq = 0; lt = -1
+ * @return {Mixed} maxValue The maximum value
+ */
+ max: function(array, comparisonFn) {
+ var max = array[0],
+ i, ln, item;
+
+ for (i = 0, ln = array.length; i < ln; i++) {
+ item = array[i];
+
+ if (comparisonFn) {
+ if (comparisonFn(max, item) === -1) {
+ max = item;
+ }
+ }
+ else {
+ if (item > max) {
+ max = item;
+ }
+ }
+ }
+
+ return max;
+ },
+
+ /**
+ * Calculates the mean of all items in the array
+ * @param {Array} array The Array to calculate the mean value of.
+ * @return {Number} The mean.
+ */
+ mean: function(array) {
+ return array.length > 0 ? ExtArray.sum(array) / array.length : undefined;
+ },
+
+ /**
+ * Calculates the sum of all items in the given array
+ * @param {Array} array The Array to calculate the sum value of.
+ * @return {Number} The sum.
+ */
+ sum: function(array) {
+ var sum = 0,
+ i, ln, item;
+
+ for (i = 0,ln = array.length; i < ln; i++) {
+ item = array[i];
+
+ sum += item;
+ }
+
+ return sum;
+ }
+
+ };
+
+ /**
+ * Convenient alias to {@link Ext.Array#each}
+ * @member Ext
+ * @method each
+ */
+ Ext.each = Ext.Array.each;
+
+ /**
+ * Alias to {@link Ext.Array#merge}.
+ * @member Ext.Array
+ * @method union
+ */
+ Ext.Array.union = Ext.Array.merge;
+
+ /**
+ * Old alias to {@link Ext.Array#min}
+ * @deprecated 4.0.0 Use {@link Ext.Array#min} instead
+ * @member Ext
+ * @method min
+ */
+ Ext.min = Ext.Array.min;
+
+ /**
+ * Old alias to {@link Ext.Array#max}
+ * @deprecated 4.0.0 Use {@link Ext.Array#max} instead
+ * @member Ext
+ * @method max
+ */
+ Ext.max = Ext.Array.max;
+
+ /**
+ * Old alias to {@link Ext.Array#sum}
+ * @deprecated 4.0.0 Use {@link Ext.Array#sum} instead
+ * @member Ext
+ * @method sum
+ */
+ Ext.sum = Ext.Array.sum;
+
+ /**
+ * Old alias to {@link Ext.Array#mean}
+ * @deprecated 4.0.0 Use {@link Ext.Array#mean} instead
+ * @member Ext
+ * @method mean
+ */
+ Ext.mean = Ext.Array.mean;
+
+ /**
+ * Old alias to {@link Ext.Array#flatten}
+ * @deprecated 4.0.0 Use {@link Ext.Array#flatten} instead
+ * @member Ext
+ * @method flatten
+ */
+ Ext.flatten = Ext.Array.flatten;
+
+ /**
+ * Old alias to {@link Ext.Array#clean Ext.Array.clean}
+ * @deprecated 4.0.0 Use {@link Ext.Array.clean} instead
+ * @member Ext
+ * @method clean
+ */
+ Ext.clean = Ext.Array.clean;
+
+ /**
+ * Old alias to {@link Ext.Array#unique Ext.Array.unique}
+ * @deprecated 4.0.0 Use {@link Ext.Array.unique} instead
+ * @member Ext
+ * @method unique
+ */
+ Ext.unique = Ext.Array.unique;
+
+ /**
+ * Old alias to {@link Ext.Array#pluck Ext.Array.pluck}
+ * @deprecated 4.0.0 Use {@link Ext.Array#pluck Ext.Array.pluck} instead
+ * @member Ext
+ * @method pluck
+ */
+ Ext.pluck = Ext.Array.pluck;
+
+ /**
+ * Convenient alias to {@link Ext.Array#toArray Ext.Array.toArray}
+ * @param {Iterable} the iterable object to be turned into a true Array.
+ * @member Ext
+ * @method toArray
+ * @return {Array} array
+ */
+ Ext.toArray = function() {
+ return ExtArray.toArray.apply(ExtArray, arguments);
+ }
+})();
+