Published Jul 01, 2022
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Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.
Input: nums = [1,2,3,1]
Output: true
Input: nums = [1,2,3,4]
Output: false
Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true
1 <= nums.length <= 10^5-10^9 <= nums[i] <= 10^9Set to check for existencefunction containsDuplicate(nums: number[]): boolean {
const s: Set<number> = new Set<number>();
for(let num of nums){
if(s.has(num)) return true
else s.add(num)
}
return false;
};