34 lines
830 B
JavaScript
34 lines
830 B
JavaScript
/**
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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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* @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; |