Contains Duplicate

Author: j2h30728

contains-duplicate/jihyeon.js

@@ -0,0 +1,8 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+var containsDuplicate = function (nums) {
+  const set = new Set(nums);
+  return set.size !== nums.length;
+};