1
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var constant = require('./constant'),
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2
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createInverter = require('./_createInverter'),
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3
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identity = require('./identity');
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4
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5
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/** Used for built-in method references. */
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6
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var objectProto = Object.prototype;
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7
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8
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/**
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9
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* Used to resolve the
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10
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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11
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* of values.
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12
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*/
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13
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var nativeObjectToString = objectProto.toString;
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14
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15
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/**
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16
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* Creates an object composed of the inverted keys and values of `object`.
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17
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* If `object` contains duplicate values, subsequent values overwrite
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18
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* property assignments of previous values.
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19
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*
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20
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* @static
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21
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* @memberOf _
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22
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* @since 0.7.0
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23
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* @category Object
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24
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* @param {Object} object The object to invert.
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25
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* @returns {Object} Returns the new inverted object.
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26
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* @example
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27
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*
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28
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* var object = { 'a': 1, 'b': 2, 'c': 1 };
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29
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*
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30
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* _.invert(object);
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31
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* // => { '1': 'c', '2': 'b' }
|
32
|
*/
|
33
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var invert = createInverter(function(result, value, key) {
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34
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if (value != null &&
|
35
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typeof value.toString != 'function') {
|
36
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value = nativeObjectToString.call(value);
|
37
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}
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38
|
|
39
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result[value] = key;
|
40
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}, constant(identity));
|
41
|
|
42
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module.exports = invert;
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