feat(soobing): contains-duplicate

Author: soobing

contains-duplicate/soobing.ts

@@ -0,0 +1,10 @@
+function containsDuplicate(nums: number[]): boolean {
+  const map = new Map();
+  for (let i = 0; i < nums.length; i++) {
+    if (map.get(nums[i])) {
+      return true;
+    } else map.set(nums[i], 1);
+  }
+
+  return false;
+}