Course Content

Introduction to JavaScript (staging)

1. Introduction

Writing our first code Output Using Variables 1/2 Output Using Variables 2/2

2. JavaScript syntax

JavaScript Syntax JavaScript Variables JavaScript Operators Identifiers in JavaScript Naming Identifiers Reserved keywords in JavaScript Naming Convention in JavaScript. Case Styles Variables Naming Convention Boolean Naming Convention Constant Naming Convention Function & Classes Naming Convention Multiline Strings Multiline Strings. Concatenating Commenting in JavaScript Commenting in JavaScript. Multi-line Comments

Let 1/2

In the very first chapter of the section we learn that there are three ways to declare a variable:

let
const
var

In the later versions of Javascript language known as ES6(ES2015), the let keyword was introduced. It works better than the var keyword. The variables written with the let keyword can also be overwritten.

<code class="go3679463865">let</code> has Block Scope:

Variables declared with the let keyword has block scope and cannot be accessed outside that scope, for example.


              1234
            
if (2 == 2){
    let  name = 'David'
}
console.log(name)

As you can see we get an error that says that the name is not defined.
Note:
Don’t worry about the if and == for now they will be covered in the later chapters.

Task

In the following code, a variable named city with the assigned value of Berlin has been given to you. You are also given an if statement that checks whether 4 is greater than 2 or not (for now, don’t worry about the if). Your task is to declare a variable with the same name as above inside the if with the value of London. Display the variable outside the if.

Task

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 3. Chapter 7

Let 1/2

In the very first chapter of the section we learn that there are three ways to declare a variable:

let
const
var

<code class="go3679463865">let</code> has Block Scope:

Variables declared with the let keyword has block scope and cannot be accessed outside that scope, for example.


              1234
            
if (2 == 2){
    let  name = 'David'
}
console.log(name)

As you can see we get an error that says that the name is not defined.
Note:
Don’t worry about the if and == for now they will be covered in the later chapters.

Task

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 3. Chapter 7

Let 1/2

In the very first chapter of the section we learn that there are three ways to declare a variable:

let
const
var

<code class="go3679463865">let</code> has Block Scope:

Variables declared with the let keyword has block scope and cannot be accessed outside that scope, for example.


              1234
            
if (2 == 2){
    let  name = 'David'
}
console.log(name)

As you can see we get an error that says that the name is not defined.
Note:
Don’t worry about the if and == for now they will be covered in the later chapters.

Task

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

In the very first chapter of the section we learn that there are three ways to declare a variable:

let
const
var

<code class="go3679463865">let</code> has Block Scope:

Variables declared with the let keyword has block scope and cannot be accessed outside that scope, for example.


              1234
            
if (2 == 2){
    let  name = 'David'
}
console.log(name)

As you can see we get an error that says that the name is not defined.
Note:
Don’t worry about the if and == for now they will be covered in the later chapters.

Task

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 3. Chapter 7

Switch to desktop for real-world practiceContinue from where you are using one of the options below