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56 lines
1.6 KiB
56 lines
1.6 KiB
var baseIteratee = require('./_baseIteratee'), |
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createInverter = require('./_createInverter'); |
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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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* Used to resolve the |
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring) |
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* of values. |
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*/ |
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var nativeObjectToString = objectProto.toString; |
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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 {Function} [iteratee=_.identity] 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 (value != null && |
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typeof value.toString != 'function') { |
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value = nativeObjectToString.call(value); |
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} |
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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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