solve(w01): 217. Contains Duplicate

Author: jeongwoo903

contains-duplicate/jeongwoo903.js

@@ -0,0 +1,11 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+
+var containsDuplicate = function(nums) {
+  const originalLength = nums.length;
+  const parsedLength = new Set(nums).size;
+
+  return originalLength !== parsedLength;
+};