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35 lines
860 B
35 lines
860 B
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @providesModule groupArray |
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* @typechecks |
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*/ |
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'use strict'; |
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/** |
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* Groups all items in the array using the specified function. An object will |
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* be returned where the keys are the group names, and the values are arrays of |
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* all the items in that group. |
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* |
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* @param {array} array |
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* @param {function} fn Should return a string with a group name |
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* @return {object} items grouped using fn |
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*/ |
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function groupArray(array, fn) { |
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var ret = {}; |
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for (var ii = 0; ii < array.length; ii++) { |
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var result = fn.call(array, array[ii], ii); |
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if (!ret[result]) { |
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ret[result] = []; |
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} |
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ret[result].push(array[ii]); |
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} |
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return ret; |
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} |
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module.exports = groupArray; |