LeetCode 260. Single Number III — JavaScript

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https://leetcode.com/problems/single-number-iii/description/?envType=daily-question&envId=2024–05–31

var singleNumber = function(nums) {
    const set = new Set(), ans = new Set()
    nums.forEach(e=>{
        if(!set.has(e)) {
            set.add(e)
            ans.add(e)
        } else {
            ans.delete(e)
        }
    })
    return Array.from(ans);
};

O(n) set

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