46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
import arrayMap from './_arrayMap.js';
|
|
import baseIntersection from './_baseIntersection.js';
|
|
import baseIteratee from './_baseIteratee.js';
|
|
import baseRest from './_baseRest.js';
|
|
import castArrayLikeObject from './_castArrayLikeObject.js';
|
|
import last from './last.js';
|
|
|
|
/**
|
|
* This method is like `_.intersection` except that it accepts `iteratee`
|
|
* which is invoked for each element of each `arrays` to generate the criterion
|
|
* by which they're compared. The order and references of result values are
|
|
* determined by the first array. 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 intersecting values.
|
|
* @example
|
|
*
|
|
* _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
|
|
* // => [2.1]
|
|
*
|
|
* // The `_.property` iteratee shorthand.
|
|
* _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
|
|
* // => [{ 'x': 1 }]
|
|
*/
|
|
var intersectionBy = baseRest(function(arrays) {
|
|
var iteratee = last(arrays),
|
|
mapped = arrayMap(arrays, castArrayLikeObject);
|
|
|
|
if (iteratee === last(mapped)) {
|
|
iteratee = undefined;
|
|
} else {
|
|
mapped.pop();
|
|
}
|
|
return (mapped.length && mapped[0] === arrays[0])
|
|
? baseIntersection(mapped, baseIteratee(iteratee, 2))
|
|
: [];
|
|
});
|
|
|
|
export default intersectionBy;
|