diff --git a/Sprint-2/implement/contains.js b/Sprint-2/implement/contains.js
index cd779308a..47ccafe33 100644
--- a/Sprint-2/implement/contains.js
+++ b/Sprint-2/implement/contains.js
@@ -1,3 +1,6 @@
-function contains() {}
+function contains(obj, prop) {
+  if (typeof obj !== "object" || obj === null || Array.isArray(obj)) return false;
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
 
 module.exports = contains;