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32 lines
745 B
32 lines
745 B
'use strict';
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var nestedValue = require('../helpers/nestedValue');
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var _require = require('../helpers/is'),
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isFunction = _require.isFunction;
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module.exports = function groupBy(key) {
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var _this = this;
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var collection = {};
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this.items.forEach(function (item, index) {
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var resolvedKey = void 0;
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if (isFunction(key)) {
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resolvedKey = key(item, index);
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} else if (nestedValue(item, key) || nestedValue(item, key) === 0) {
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resolvedKey = nestedValue(item, key);
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} else {
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resolvedKey = '';
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}
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if (collection[resolvedKey] === undefined) {
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collection[resolvedKey] = new _this.constructor([]);
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}
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collection[resolvedKey].push(item);
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});
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return new this.constructor(collection);
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};
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