feat : Contains-Duplicate 문제 풀이 완료

Author: owen

contains-duplicate/Kyojin-Hwang.js

@@ -0,0 +1,22 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+var containsDuplicate = function (nums) {
+  const map = new Map();
+
+  for (let num of nums) {
+    map.set(num, (map.get(num) || 0) + 1);
+  }
+
+  for (let [_, count] of map) {
+    if (count > 1) return true;
+  }
+
+  return false;
+};
+
+// set 방식으로도 대체가능
+// var containsDuplicate = function(nums) {
+//     return new Set(nums).size !== nums.length;
+// };