forked from zhurui/management
40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
|
var baseFlatten = require('./_baseFlatten'),
|
||
|
|
baseIteratee = require('./_baseIteratee'),
|
||
|
|
baseRest = require('./_baseRest'),
|
||
|
|
baseUniq = require('./_baseUniq'),
|
||
|
|
isArrayLikeObject = require('./isArrayLikeObject'),
|
||
|
|
last = require('./last');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This method is like `_.union` except that it accepts `iteratee` which is
|
||
|
|
* invoked for each element of each `arrays` to generate the criterion by
|
||
|
|
* which uniqueness is computed. Result values are chosen from the first
|
||
|
|
* array in which the value occurs. The iteratee is invoked with one argument:
|
||
|
|
* (value).
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @since 4.0.0
|
||
|
|
* @category Array
|
||
|
|
* @param {...Array} [arrays] The arrays to inspect.
|
||
|
|
* @param {Function} [iteratee=_.identity] The iteratee invoked per element.
|
||
|
|
* @returns {Array} Returns the new array of combined values.
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* _.unionBy([2.1], [1.2, 2.3], Math.floor);
|
||
|
|
* // => [2.1, 1.2]
|
||
|
|
*
|
||
|
|
* // The `_.property` iteratee shorthand.
|
||
|
|
* _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
|
||
|
|
* // => [{ 'x': 1 }, { 'x': 2 }]
|
||
|
|
*/
|
||
|
|
var unionBy = baseRest(function(arrays) {
|
||
|
|
var iteratee = last(arrays);
|
||
|
|
if (isArrayLikeObject(iteratee)) {
|
||
|
|
iteratee = undefined;
|
||
|
|
}
|
||
|
|
return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2));
|
||
|
|
});
|
||
|
|
|
||
|
|
module.exports = unionBy;
|