Coding Problem: Contains Duplicate Question

Marika Lam

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Jul 2, 2024

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Prompt

Solution 1

var containsDuplicate = function(nums) {
    return nums.length !== new Set(nums).size;
};

Solution 2

var containsDuplicate = function(nums) {
    let obj = {};
    for (let i=0; i<nums.length; i++){
        let num = nums[i];
        if (obj[num]){
            return true;
        } else {
            obj[num] = true;
        }
    }
    return false;
}

• For small arrays, using the sets method in Solution 1 is faster. For larger arrays (over around 10,000 elements), then Solution 2 is faster.