| 1 | var baseIteratee = require('./_baseIteratee'),
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| 2 | createInverter = require('./_createInverter');
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| 3 |
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| 4 | /** Used for built-in method references. */
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| 5 | var objectProto = Object.prototype;
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| 6 |
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| 7 | /** Used to check objects for own properties. */
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| 8 | var hasOwnProperty = objectProto.hasOwnProperty;
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| 9 |
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| 10 | /**
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| 11 | * This method is like `_.invert` except that the inverted object is generated
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| 12 | * from the results of running each element of `object` thru `iteratee`. The
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| 13 | * corresponding inverted value of each inverted key is an array of keys
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| 14 | * responsible for generating the inverted value. The iteratee is invoked
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| 15 | * with one argument: (value).
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| 16 | *
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| 17 | * @static
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| 18 | * @memberOf _
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| 19 | * @since 4.1.0
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| 20 | * @category Object
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| 21 | * @param {Object} object The object to invert.
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| 22 | * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
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| 23 | * @returns {Object} Returns the new inverted object.
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| 24 | * @example
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| 25 | *
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| 26 | * var object = { 'a': 1, 'b': 2, 'c': 1 };
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| 27 | *
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| 28 | * _.invertBy(object);
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| 29 | * // => { '1': ['a', 'c'], '2': ['b'] }
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| 30 | *
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| 31 | * _.invertBy(object, function(value) {
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| 32 | * return 'group' + value;
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| 33 | * });
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| 34 | * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
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| 35 | */
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| 36 | var invertBy = createInverter(function(result, value, key) {
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| 37 | if (hasOwnProperty.call(result, value)) {
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| 38 | result[value].push(key);
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| 39 | } else {
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| 40 | result[value] = [key];
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| 41 | }
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| 42 | }, baseIteratee);
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| 43 |
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| 44 | module.exports = invertBy;
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