diff --git a/JavaScript/1-wrap.js b/JavaScript/1-wrap.js
index e90b5d6..c926e18 100644
--- a/JavaScript/1-wrap.js
+++ b/JavaScript/1-wrap.js
@@ -1,29 +1,34 @@
 'use strict';
 
-function cloneInterface(anInterface) {
-  let fn, clone = {};
-  for (let key in anInterface) {
-    fn = anInterface[key];
-    clone[key] = wrapFunction(fn);
-  }
-  return clone;
+function cloneInterface(anInterface, beforeCall, afterCall) {
+    let fn, clone = {};
+    for (let key in anInterface) {
+        fn = anInterface[key];
+        clone[key] = wrapFunction(fn, beforeCall, afterCall);
+    }
+    return clone;
 }
 
-function wrapFunction(fn) {
-  console.log('Wrap function: ' + fn.name);
-  return (...args) => {
-    console.log('Called wrapper for: ' + fn.name);
-    console.dir({ args });
-    fn.apply(undefined, args);
-    console.log('Ended wrapper for: ' + fn.name);
-  };
+function wrapFunction(fn, beforeCall, afterCall) {
+    console.log('Wrap function: ' + fn.name);
+    return (...args) => {
+        beforeCall();
+        console.log('Called wrapper for: ' + fn.name);
+        console.dir({ args });
+        fn.apply(undefined, args);
+        console.log('Ended wrapper for: ' + fn.name);
+        afterCall();
+    };
 }
 
 let interfaceName = {
-  methodName: function(par1, par2) {
-    console.dir({ method: { par1, par2 } });
-  }
+    methodName: function(par1, par2) {
+        console.dir({ method: { par1, par2 } });
+    }
 };
 
-let cloned = cloneInterface(interfaceName);
+let cloned = cloneInterface(interfaceName,
+                                            ()=>console.log('aaaaa'),
+                                            ()=>console.log('zzzzz')
+                            );
 cloned.methodName('Uno', 'Due');