contains-duplicate solution

Author: 이호찬

contains-duplicate/lhc0506.js

@@ -0,0 +1,10 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+var containsDuplicate = function(nums) {
+    const numsSet = new Set();
+    nums.forEach(num => numsSet.add(num));
+
+    return nums.length !== numsSet.size;
+};