contains duplicate solution

Author: suhacs

contains-duplicate/suhacs.js

@@ -1,3 +1,16 @@
+/**
+ * @description
+ * time complexity: O(n)
+ * space complexity: O(n)
+ * approach/strategy:
+ * 1. brute force + hash table
+ */
+
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+
 function containsDuplicate(nums) {
   const setLength = [...new Set(nums)].length;
   const numLength = nums.length;