contains-duplicate solution

Author: Moonjonghoo

contains-duplicate/moonjonghoo.js

@@ -0,0 +1,12 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+var containsDuplicate = function (nums) {
+  let nums_length = nums.length;
+  let hash = new Set(nums);
+  let hash_legnth = hash.size;
+  return nums_length === hash_legnth ? false : true;
+};
+
+containsDuplicate([1, 2, 3, 1]);