contains duplicates solution

Author: yoon-turtle

contains-duplicate/yoonthecoder.js

@@ -0,0 +1,10 @@
+var containsDuplicate = function (nums) {
+  // Create a set from the nums array. Since Sets only allow unique values, any duplicates will be removed.
+  const set = new Set(nums);
+  // Compare the size of the set and the length of the original array.- if the size of the set is smaller than the length of the original array('nums'), it means there were duplicates.
+
+  return set.size < nums.length;
+};
+
+// Time Complexity: O(n); - adding elements to the Set & compare sizes
+// Space Complexity: O(n)