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56 行
1.6 KiB
56 行
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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