diff --git a/JavaScript/Chapter 16/452-456 Making the queue reusable.js b/JavaScript/Chapter 16/452-456 Making the queue reusable.js
index a3288ad..2fd8c2d 100644
--- a/JavaScript/Chapter 16/452-456 Making the queue reusable.js	
+++ b/JavaScript/Chapter 16/452-456 Making the queue reusable.js	
@@ -44,7 +44,7 @@ function Queue() {
     function worker(cart, done) {
       calc_cart_total(cart, function(total) {
         update_total_dom(total);
-        done(total);
+        done();
       });
     }
     worker(cart, function() {
@@ -91,7 +91,7 @@ function Queue(worker) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
@@ -130,7 +130,7 @@ function Queue(worker) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
@@ -170,8 +170,8 @@ function Queue(worker) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
-var update_total_queue = Queue(calc_cart_worker);
\ No newline at end of file
+var update_total_queue = Queue(calc_cart_worker);
diff --git a/JavaScript/Chapter 16/461-462 Making the queue skip.js b/JavaScript/Chapter 16/461-462 Making the queue skip.js
index 480bda9..d9a700f 100644
--- a/JavaScript/Chapter 16/461-462 Making the queue skip.js	
+++ b/JavaScript/Chapter 16/461-462 Making the queue skip.js	
@@ -32,7 +32,7 @@ function Queue(worker) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
@@ -72,8 +72,8 @@ function DroppingQueue(max, worker) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
-var update_total_queue = DroppingQueue(1, calc_cart_worker);
\ No newline at end of file
+var update_total_queue = DroppingQueue(1, calc_cart_worker);
diff --git a/JavaScript/Chapter 17/471 How the code was changed.js b/JavaScript/Chapter 17/471 How the code was changed.js
index 764aac5..d7e36c5 100644
--- a/JavaScript/Chapter 17/471 How the code was changed.js	
+++ b/JavaScript/Chapter 17/471 How the code was changed.js	
@@ -19,7 +19,7 @@ function calc_cart_total(cart, callback) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
@@ -46,8 +46,8 @@ function calc_cart_total(cart, callback) {
 function calc_cart_worker(cart, done) {
   calc_cart_total(cart, function(total) {
     update_total_dom(total);
-    done(total);
+    done();
   });
 }
 
-var update_total_queue = DroppingQueue(1, calc_cart_worker);
\ No newline at end of file
+var update_total_queue = DroppingQueue(1, calc_cart_worker);