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| import baseAssignValue from './.internal/baseAssignValue.js' | |
| import reduce from './reduce.js' | |
| /** Used to check objects for own properties. */ | |
| const hasOwnProperty = Object.prototype.hasOwnProperty | |
| /** | |
| * Creates an object composed of keys generated from the results of running | |
| * each element of `collection` thru `iteratee`. The order of grouped values | |
| * is determined by the order they occur in `collection`. The corresponding | |
| * value of each key is an array of elements responsible for generating the | |
| * key. The iteratee is invoked with one argument: (value). | |
| * | |
| * @since 0.1.0 | |
| * @category Collection | |
| * @param {Array|Object} collection The collection to iterate over. | |
| * @param {Function} iteratee The iteratee to transform keys. | |
| * @returns {Object} Returns the composed aggregate object. | |
| * @example | |
| * | |
| * groupBy([6.1, 4.2, 6.3], Math.floor) | |
| * // => { '4': [4.2], '6': [6.1, 6.3] } | |
| */ | |
| function groupBy(collection, iteratee) { | |
| return reduce(collection, (result, value, key) => { | |
| key = iteratee(value) | |
| if (hasOwnProperty.call(result, key)) { | |
| result[key].push(value) | |
| } else { | |
| baseAssignValue(result, key, [value]) | |
| } | |
| return result | |
| }, {}) | |
| } | |
| export default groupBy |