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| /** Used to check objects for own properties. */ | |
| const hasOwnProperty = Object.prototype.hasOwnProperty | |
| /** | |
| * This method is like `invert` except that the inverted object is generated | |
| * from the results of running each element of `object` thru `iteratee`. The | |
| * corresponding inverted value of each inverted key is an array of keys | |
| * responsible for generating the inverted value. The iteratee is invoked | |
| * with one argument: (value). | |
| * | |
| * @since 4.1.0 | |
| * @category Object | |
| * @param {Object} object The object to invert. | |
| * @param {Function} iteratee The iteratee invoked per element. | |
| * @returns {Object} Returns the new inverted object. | |
| * @example | |
| * | |
| * const object = { 'a': 1, 'b': 2, 'c': 1 } | |
| * | |
| * invertBy(object, value => `group${value}`) | |
| * // => { 'group1': ['a', 'c'], 'group2': ['b'] } | |
| */ | |
| function invertBy(object, iteratee) { | |
| const result = {} | |
| Object.keys(object).forEach((key) => { | |
| const value = iteratee(object[key]) | |
| if (hasOwnProperty.call(result, value)) { | |
| result[value].push(key) | |
| } else { | |
| result[value] = [key] | |
| } | |
| }) | |
| return result | |
| } | |
| export default invertBy |