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