intersectionWith.js (1388B)
1 var arrayMap = require('./_arrayMap'), 2 baseIntersection = require('./_baseIntersection'), 3 baseRest = require('./_baseRest'), 4 castArrayLikeObject = require('./_castArrayLikeObject'), 5 last = require('./last'); 6 7 /** 8 * This method is like `_.intersection` except that it accepts `comparator` 9 * which is invoked to compare elements of `arrays`. The order and references 10 * of result values are determined by the first array. The comparator is 11 * invoked with two arguments: (arrVal, othVal). 12 * 13 * @static 14 * @memberOf _ 15 * @since 4.0.0 16 * @category Array 17 * @param {...Array} [arrays] The arrays to inspect. 18 * @param {Function} [comparator] The comparator invoked per element. 19 * @returns {Array} Returns the new array of intersecting values. 20 * @example 21 * 22 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; 23 * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; 24 * 25 * _.intersectionWith(objects, others, _.isEqual); 26 * // => [{ 'x': 1, 'y': 2 }] 27 */ 28 var intersectionWith = baseRest(function(arrays) { 29 var comparator = last(arrays), 30 mapped = arrayMap(arrays, castArrayLikeObject); 31 32 comparator = typeof comparator == 'function' ? comparator : undefined; 33 if (comparator) { 34 mapped.pop(); 35 } 36 return (mapped.length && mapped[0] === arrays[0]) 37 ? baseIntersection(mapped, undefined, comparator) 38 : []; 39 }); 40 41 module.exports = intersectionWith;