Intersection of Two Arrays · LeetCode Site Generator

Description

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

Example 1:

Input: nums1 = [1,2,2,1], nums2 = [2,2]
Output: [2]

Example 2:

Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]
Output: [9,4]

Note:

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

Solution(javascript)

/**
 * @param {number[]} nums1
 * @param {number[]} nums2
 * @return {number[]}
 */
var intersection = (arr1 = [], arr2 = []) => {
    const map = arr1.reduce((acc, num) => {
    acc[num] = true
    return acc }, {})
    return arr2.reduce((acc, num) => { if (map[num]) {
    acc.push(num)
    map[num] = false }
    return acc }, [])
}