change cover and readme, update quizzes

Author: AlbertoMontalesi

README.md

@@ -11,9 +11,11 @@
 [![HitCount](http://hits.dwyl.io/albertomontalesi/JavaScript-es6-and-beyond-ebook.svg)](http://hits.dwyl.io/albertomontalesi/JavaScript-es6-and-beyond-ebook)
 
 
-# JavaScript ES6 and beyond: Discover all the new features introduced to JavaScript from 2015 to 2018
+# [The Complete Guide to Modern JavaScript ](https://www.amazon.com/dp/B07DGGFNS6)
 
-![book-cover](/assets/cover.png)
+## Discover all the new features introduced to JavaScript from 2015 to 2018
+
+![book-cover](/assets/cover.jpg)
 
 ## Disclaimer
 
@@ -24,14 +26,13 @@ Additional chapters cover the new features introduced post ES6 (ES2015) all the
 
 ## About me
 
-My name is Alberto, I'm from Italy and I love programming. As I was studying ES6 I decided that the best way for me to test my understanding of it was to write articles about it. I have now packaged those articles in a free ebook that you can read here or on my blog [here](http://albertomontalesi.github.io/).
-
-## Contributions & Donations [![](https://img.shields.io/badge/Donate-PayPal-blue.svg)](https://www.paypal.me/albertomontalesi)
+My name is Alberto, I'm from Italy and I love programming. As I was studying ES6 I decided that the best way for me to test my understanding of it was to write articles about it. I have now packaged those articles in a ebook that you can purchase on amazon.com at this [link](https://www.amazon.com/dp/B07DGGFNS6) or click [here](http://bit.ly/2kGMwKn) if you are not in the US to find the right amazon store.
 
+The ebook contains 50+ extra quizzes for your to practice and test your knowledge after reading each chapter.
+You can have a look at the quizzes from the first two chapters in the `quizzes` folder.
 
-Any contributions you make are of course greatly appreciated.
+You can also read my articles on my blog [here](https://www.inspiredwebdev.com/).
 
-If you enjoy my content and you want to donate me a cup of coffee, you can do so [here](https://www.paypal.me/albertomontalesi).
 
 ## License
 

assets/Cover.jpg

@@ -87,7 +87,6 @@ code.includes("CDE");
 As the name suggests, this new method will repeat what we pass in.
 
 ``` js
-
 let hello = "Hi";
 console.log(hello.repeat(10));
 // "HiHiHiHiHiHiHiHiHiHi"

assets/cover.png

@@ -60,7 +60,7 @@ for (const prop of Object.keys(car)){
 
 ## The `for in` loop
 
-Even though it is not a new ES6 loop, let's look at the `for in` loop to understand what differentiate it compared to the `for of.
+Even though it is not a new ES6 loop, let's look at the `for in` loop to understand what differentiate it compared to the `for of`.
 
 The `for in` loop is a bit different because it will iterate over all the [enumerable properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties) of an object in no particular order.
 

ebook/05_additional_string_methods.md

@@ -1,29 +1,28 @@
 # Chapter 1: Var vs Let vs Const & the temporal dead zone
 
-## End of chapter quiz
+## End of Chapter 1 Quiz
 
-1) What is the correct output of this code?
+### 1.1 What is the correct output of the following code?
 
 ```js
 var greeting = "Hello";
 
 greeting = "Farewell";
 
 for (var i = 0; i < 2; i++) {
-  var greeting = "Goodmorning";
+  var greeting = "Good morning";
 }
 
 console.log(greeting);
 ```
 
-- [] Hello
-- [*] Goodmorning
-- [] Farewell;
+- [ ] Hello
+- [ ] Good morning
+- [ ] Farewell;
 
 &nbsp;
 
-2) What is the correct output of this code?
-
+### 1.2 What is the correct output of the following code?
 
 ```js
 let value = 1;
@@ -36,20 +35,38 @@ if(true) {
 value = 3;
 ```
 
-- [] 1
-- [*] 2
-- [] 3
+- [ ] 1
+- [ ] 2
+- [ ] 3
 
+&nbsp;
 
-3) What is the correct output of this code?
+### 1.3 What is the correct output of the following code?
+
+```js
+let x = 100;
+
+if (x > 50) {
+  let x = 10;
+}
+
+console.log(x);
+```
+
+- [ ] 10
+- [ ] 100
+- [ ] 50
+
+&nbsp;
+
+### 1.4 What is the correct output of the following code?
 
 ```js
 console.log(constant);
 
 const constant = 1;
 ```
 
-- [] undefined
-- [*] ReferenceError
-- 1
-
+- [ ] undefined
+- [ ] ReferenceError
+- [ ] 1

ebook/07_iterables-and-looping.md

@@ -1,35 +1,29 @@
 # Chapter 2: Arrow functions
 
-## End of chapter quiz
+## End of Chapter 2 Quiz
 
-1) What is the correct syntax for an arrow function?
+### 2.1 What is the correct syntax for an arrow function?
 
 ```js
 let arr = [1,2,3];
 
-a)
+//a)
 let func = arr.map(n -> n+1);
 
-b)
+//b)
 let func = arr.map(n => n+1);
 
-c)
+//c)
 let func = arr.map(n ~> n+1);
 ```
 
-- [] a
-- [] b
-- [*] c
-
-
-> The correct syntax for an arrow function is the so called fat arrow `=>`
+- [ ] a
+- [ ] b
+- [ ] c
 
  
 
-
-// example with this keyword
-
-2) What is the correct output of this code?
+### 2.2 What is the correct output of the following code?
 
 ``` js
 const person = {
@@ -43,9 +37,16 @@ person.grow();
 console.log(person.age);
 ```
 
-- [*] 10
-- [] 11
-- [] undefined
+- [ ] 10
+- [ ] 11
+- [ ] undefined
 
-> Inside an arrow function, the `this` keyword inherits from its parent scope which in this case it's the window, therefore the `age` remains 10.
+ 
+
+### 2.3 Refactor the following code to use the arrow function syntax:
 
+```js
+function(arg) {
+  console.log(arg);
+}
+```