contains duplicate

Author: Totschka

contains-duplicate/Totschka.ts

@@ -0,0 +1,12 @@
+// https://leetcode.com/problems/contains-duplicate/
+function containsDuplicate(nums: number[]): boolean {
+  const counter = {};
+  for (const n of nums) {
+    if (!counter[n]) {
+      counter[n] = 1;
+    } else {
+      return true;
+    }
+  }
+  return false;
+}