intersection.js•983 B
var _contains = require('./internal/_contains');
var _curry2 = require('./internal/_curry2');
var _filter = require('./internal/_filter');
var flip = require('./flip');
var uniq = require('./uniq');
/**
* Combines two lists into a set (i.e. no duplicates) composed of those
* elements common to both lists.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig [*] -> [*] -> [*]
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The list of elements found in both `list1` and `list2`.
* @see R.intersectionWith
* @example
*
* R.intersection([1,2,3,4], [7,6,5,4,3]); //=> [4, 3]
*/
module.exports = _curry2(function intersection(list1, list2) {
var lookupList, filteredList;
if (list1.length > list2.length) {
lookupList = list1;
filteredList = list2;
} else {
lookupList = list2;
filteredList = list1;
}
return uniq(_filter(flip(_contains)(lookupList), filteredList));
});