You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
6 years ago
|
var baseIteratee = require('./_baseIteratee'),
|
||
|
|
createInverter = require('./_createInverter');
|
||
|
|
|
||
|
|
/** Used for built-in method references. */
|
||
|
|
var objectProto = Object.prototype;
|
||
|
|
|
||
|
|
/** Used to check objects for own properties. */
|
||
|
|
var hasOwnProperty = objectProto.hasOwnProperty;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Used to resolve the
|
||
|
|
* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
|
||
|
|
* of values.
|
||
|
|
*/
|
||
|
|
var nativeObjectToString = objectProto.toString;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This method is like `_.invert` except that the inverted object is generated
|
||
|
|
* from the results of running each element of `object` thru `iteratee`. The
|
||
|
|
* corresponding inverted value of each inverted key is an array of keys
|
||
|
|
* responsible for generating the inverted value. The iteratee is invoked
|
||
|
|
* with one argument: (value).
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @since 4.1.0
|
||
|
|
* @category Object
|
||
|
|
* @param {Object} object The object to invert.
|
||
|
|
* @param {Function} [iteratee=_.identity] The iteratee invoked per element.
|
||
|
|
* @returns {Object} Returns the new inverted object.
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* var object = { 'a': 1, 'b': 2, 'c': 1 };
|
||
|
|
*
|
||
|
|
* _.invertBy(object);
|
||
|
|
* // => { '1': ['a', 'c'], '2': ['b'] }
|
||
|
|
*
|
||
|
|
* _.invertBy(object, function(value) {
|
||
|
|
* return 'group' + value;
|
||
|
|
* });
|
||
|
|
* // => { 'group1': ['a', 'c'], 'group2': ['b'] }
|
||
|
|
*/
|
||
|
|
var invertBy = createInverter(function(result, value, key) {
|
||
|
|
if (value != null &&
|
||
|
|
typeof value.toString != 'function') {
|
||
|
|
value = nativeObjectToString.call(value);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hasOwnProperty.call(result, value)) {
|
||
|
|
result[value].push(key);
|
||
|
|
} else {
|
||
|
|
result[value] = [key];
|
||
|
|
}
|
||
|
|
}, baseIteratee);
|
||
|
|
|
||
|
|
module.exports = invertBy;
|