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99 lines
3.2 KiB
JavaScript
99 lines
3.2 KiB
JavaScript
/**
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* lodash 4.4.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright jQuery Foundation and other contributors <https://jquery.org/>
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* Released under MIT license <https://lodash.com/license>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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*/
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var baseFor = require('lodash._basefor'),
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baseIteratee = require('lodash._baseiteratee'),
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keys = require('lodash.keys');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* The base implementation of `_.forOwn` without support for iteratee shorthands.
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*
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* @private
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* @param {Object} object The object to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @returns {Object} Returns `object`.
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*/
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function baseForOwn(object, iteratee) {
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return object && baseFor(object, iteratee, keys);
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}
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/**
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* The base implementation of `_.invert` and `_.invertBy` which inverts
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* `object` with values transformed by `iteratee` and set by `setter`.
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*
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* @private
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* @param {Object} object The object to iterate over.
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* @param {Function} setter The function to set `accumulator` values.
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* @param {Function} iteratee The iteratee to transform values.
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* @param {Object} accumulator The initial inverted object.
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* @returns {Function} Returns `accumulator`.
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*/
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function baseInverter(object, setter, iteratee, accumulator) {
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baseForOwn(object, function(value, key, object) {
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setter(accumulator, iteratee(value), key, object);
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});
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return accumulator;
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}
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/**
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* Creates a function like `_.invertBy`.
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*
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* @private
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* @param {Function} setter The function to set accumulator values.
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* @param {Function} toIteratee The function to resolve iteratees.
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* @returns {Function} Returns the new inverter function.
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*/
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function createInverter(setter, toIteratee) {
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return function(object, iteratee) {
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return baseInverter(object, setter, toIteratee(iteratee), {});
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};
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}
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/**
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* This method is like `_.invert` except that the inverted object is generated
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* from the results of running each element of `object` thru `iteratee`. The
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* corresponding inverted value of each inverted key is an array of keys
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* responsible for generating the inverted value. The iteratee is invoked
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* with one argument: (value).
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*
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* @static
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* @memberOf _
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* @since 4.1.0
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* @category Object
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* @param {Object} object The object to invert.
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* @param {Array|Function|Object|string} [iteratee=_.identity]
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* The iteratee invoked per element.
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* @returns {Object} Returns the new inverted object.
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* @example
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*
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* var object = { 'a': 1, 'b': 2, 'c': 1 };
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*
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* _.invertBy(object);
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* // => { '1': ['a', 'c'], '2': ['b'] }
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*
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* _.invertBy(object, function(value) {
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* return 'group' + value;
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* });
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* // => { 'group1': ['a', 'c'], 'group2': ['b'] }
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*/
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var invertBy = createInverter(function(result, value, key) {
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if (hasOwnProperty.call(result, value)) {
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result[value].push(key);
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} else {
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result[value] = [key];
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}
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}, baseIteratee);
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module.exports = invertBy;
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