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- 'use strict';
-
- var nestedValue = require('../helpers/nestedValue');
-
- var _require = require('../helpers/is'),
- isFunction = _require.isFunction;
-
- module.exports = function keyBy(key) {
- var collection = {};
-
- if (isFunction(key)) {
- this.items.forEach(function (item) {
- collection[key(item)] = item;
- });
- } else {
- this.items.forEach(function (item) {
- var keyValue = nestedValue(item, key);
-
- collection[keyValue || ''] = item;
- });
- }
-
- return new this.constructor(collection);
- };
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