DuplicateInteger.js

/**
 * 
 * 
 *  Duplicate Integer
 *  Given an integer array nums, return true if any value appears more than once in the array, otherwise return false.
 *  Example 1:
 *  Input: nums = [1, 2, 3, 3    
 *  Output: true
 *  Example 2    
 *  Input: nums = [1, 2, 3, 4    
 *  Output: false
 */
class Solution {
  /**
   * @param {number[]} nums
   * @return {boolean}
   */
  hasDuplicate(nums) {
    const seen = new Set();
    for (const num of nums) {
      if (seen.has(num)) {
        return true;
      }
      seen.add(num);
    }
    return false;
  }
}

// Example Usage:

const solution = new Solution();

// Example 1
const nums1 = [1, 2, 3, 3];
console.log(solution.hasDuplicate(nums1)); // Output: true

// Example 2
const nums2 = [1, 2, 3, 4];
console.log(solution.hasDuplicate(nums2)); // Output: false