add quiz chapter 1 and 2

Author: AlbertoMontalesi

README.md

@@ -23,7 +23,6 @@ Additional chapters cover the new features introduced post ES6 (ES2015) all the
 
 ## Download
 
-Download the ebook in PDF or EPUB format from [here](https://github.com/AlbertoMontalesi/JavaScript-es6-and-beyond-ebook/releases)
 
 ## About me
 

ebook/02_arrow_functions.md

@@ -84,7 +84,7 @@ greeting("Tom");
 
 ## Arrow function and the `this` keyword
 
-You need to be careful when using arrow functions in conjunction with the this keyword, as they behave differently from normal functions.
+You need to be careful when using arrow functions in conjunction with the `this` keyword, as they behave differently from normal functions.
 
 When you use an arrow function, the `this` keyword is inherited from the parent scope.
 
@@ -151,8 +151,8 @@ const person = {
   age: 10,
   grow: () => {
     // error: *this* refers to the window
-    this.age++,
-  },
+    this.age++;
+  }
 }
 ```
 

quizzes/01_var_let_const.md

@@ -0,0 +1,55 @@
+# Chapter 1: Var vs Let vs Const & the temporal dead zone
+
+## End of chapter quiz
+
+1) What is the correct output of this code?
+
+```js
+var greeting = "Hello";
+
+greeting = "Farewell";
+
+for (var i = 0; i < 2; i++) {
+  var greeting = "Goodmorning";
+}
+
+console.log(greeting);
+```
+
+- [] Hello
+- [*] Goodmorning
+- [] Farewell;
+
+&nbsp;
+
+2) What is the correct output of this code?
+
+
+```js
+let value = 1;
+
+if(true) {
+  let value = 2;
+  console.log(value);
+}
+
+value = 3;
+```
+
+- [] 1
+- [*] 2
+- [] 3
+
+
+3) What is the correct output of this code?
+
+```js
+console.log(constant);
+
+const constant = 1;
+```
+
+- [] undefined
+- [*] ReferenceError
+- 1
+

quizzes/02_arrow_functions.md

@@ -0,0 +1,51 @@
+# Chapter 2: Arrow functions
+
+## End of chapter quiz
+
+1) What is the correct syntax for an arrow function?
+
+```js
+let arr = [1,2,3];
+
+a)
+let func = arr.map(n -> n+1);
+
+b)
+let func = arr.map(n => n+1);
+
+c)
+let func = arr.map(n ~> n+1);
+```
+
+- [] a
+- [] b
+- [*] c
+
+
+> The correct syntax for an arrow function is the so called fat arrow `=>`
+
+ 
+
+
+// example with this keyword
+
+2) What is the correct output of this code?
+
+``` js
+const person = {
+  age: 10,
+  grow: () => {
+    this.age++;
+  },
+}
+person.grow();
+
+console.log(person.age);
+```
+
+- [*] 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.
+