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42 lines
1.1 KiB
42 lines
1.1 KiB
var constant = require('./constant'),
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createInverter = require('./_createInverter'),
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identity = require('./identity');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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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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* Creates an object composed of the inverted keys and values of `object`.
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* If `object` contains duplicate values, subsequent values overwrite
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* property assignments of previous values.
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*
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* @static
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* @memberOf _
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* @since 0.7.0
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* @category Object
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* @param {Object} object The object to invert.
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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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* _.invert(object);
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* // => { '1': 'c', '2': 'b' }
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*/
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var invert = 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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result[value] = key;
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}, constant(identity));
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module.exports = invert;
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