4.1 done

4.1object/t4.js

@@ -0,0 +1,23 @@
+// before the call
+let menu = {
+  width: 200,
+  height: 300,
+  title: "My menu"
+};
+
+multiplyNumeric(menu);
+
+// after the call
+menu = {
+  width: 400,
+  height: 600,
+  title: "My menu"
+};
+
+function multiplyNumeric(menu){
+    for(prop in menu){
+        if(typeof menu[prop] == 'number'){
+            menu[prop] *= 2;
+        }
+    }
+}