contains-duplicate

Author: jun0811

contains-duplicate/jun0811.js

@@ -0,0 +1,18 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+var containsDuplicate = function (nums) {
+  const count = [];
+  let res = false;
+
+  for (const num of nums) {
+    if (count[num]) {
+      res = true;
+      break;
+    } else {
+      count[num] = 1;
+    }
+  }
+  return res;
+};