contains-duplicate solution

Author: wooseok123

contains-duplicate/wooseok123.js

@@ -0,0 +1,7 @@
+// TC : O(n) | SC : O(n)
+
+function containsDuplicate(nums) {
+  let original_length = nums.length;
+  let modified_length = new Set(nums).size;
+  return original_length !== modified_length;
+}