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