Check If N and Its Double Exist LeetCode solution in JavaScript

1
/**
2
 * @param {number[]} arr
3
 * @return {boolean}
4
 */
5
var checkIfExist = function (arr) {
6
  for (let i = 0; i < arr.length; i++) {
7
    for (let j = 0; j < arr.length; j++) {
8
      if (i !== j && arr[i] == 2 * arr[j]) {
9
        return true;
10
      }
11
    }
12
  }
13
  return false;
14
};