349. Intersection of Two Arrays

Description

Given two arrays, write a function to compute their intersection.

Example: Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2].

Note:

• Each element in the result must be unique.
• The result can be in any order.

Solution

/**
 * @param {number[]} nums1
 * @param {number[]} nums2
 * @return {number[]}
 */
var intersection = function(nums1, nums2) {
    "use strict";
    function intersect(x, y) {
        let result = [];
        for (let val of y.values()) {
            if (x.has(val)) {
                result.push(val);
            }
        }
        return result;
    }
    nums1 = new Set(nums1);
    nums2 = new Set(nums2);
    return nums1.size > nums2.size ? intersect(nums1, nums2) : intersect(nums2, nums1);
};