jm-leetcode
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/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function(nums) {
const map = {};
for (let num of nums) {
if (num in map) return true;
map[num] = num;
}
return false;
};
var containsDuplicateSet = function(nums) {
return new Set(nums).size !== nums.length;
};
containsDuplicate([1,2,3,4,5,1]);
JavaScript
INFO