Contains Duplicate
Description
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.
Example 1:
Input: nums = [1,2,3,1] Output: true
Example 2:
Input: nums = [1,2,3,4] Output: false
Example 3:
Input: nums = [1,1,1,3,3,4,3,2,4,2] Output: true
Constraints:
1 <= nums.length <= 105
-109 <= nums[i] <= 109
Solution(javascript)
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function(nums) {
let seen = {};
for (let i = 0; i < nums.length; i++) {
if(seen[nums[i]]) {
return true;
} else {
seen[nums[i]] = 1;
}
}
return false;
};