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x/lodash/invertBy.js

A modern JavaScript utility library delivering modularity, performance, & extras.
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import baseIteratee from './_baseIteratee.js';import createInverter from './_createInverter.js';
/** Used for built-in method references. */var objectProto = Object.prototype;
/** Used to check objects for own properties. */var hasOwnProperty = objectProto.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). * * @static * @memberOf _ * @since 4.1.0 * @category Object * @param {Object} object The object to invert. * @param {Function} [iteratee=_.identity] The iteratee invoked per element. * @returns {Object} Returns the new inverted object. * @example * * var object = { 'a': 1, 'b': 2, 'c': 1 }; * * _.invertBy(object); * // => { '1': ['a', 'c'], '2': ['b'] } * * _.invertBy(object, function(value) { * return 'group' + value; * }); * // => { 'group1': ['a', 'c'], 'group2': ['b'] } */var invertBy = createInverter(function(result, value, key) { if (hasOwnProperty.call(result, value)) { result[value].push(key); } else { result[value] = [key]; }}, baseIteratee);
export default invertBy;