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

Null

What is Null

The data type null represents that there is no value. It is a primitive value in javascript.

To have a better understanding of null, we must know these two features about null:

null provides the non-existent value or empty value.
null has to be assigned to a variable as it is not assigned by default (unlike the undefined).


              12
            
let number = null;
console.log(number);

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

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

Everything was clear?

Section 3. Chapter 30

Null

What is Null

The data type null represents that there is no value. It is a primitive value in javascript.

To have a better understanding of null, we must know these two features about null:

null provides the non-existent value or empty value.
null has to be assigned to a variable as it is not assigned by default (unlike the undefined).


              12
            
let number = null;
console.log(number);

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

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

Everything was clear?

Section 3. Chapter 30

Null

What is Null

The data type null represents that there is no value. It is a primitive value in javascript.

To have a better understanding of null, we must know these two features about null:

null provides the non-existent value or empty value.
null has to be assigned to a variable as it is not assigned by default (unlike the undefined).


              12
            
let number = null;
console.log(number);

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

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

Everything was clear?

What is Null

The data type null represents that there is no value. It is a primitive value in javascript.

To have a better understanding of null, we must know these two features about null:

null provides the non-existent value or empty value.
null has to be assigned to a variable as it is not assigned by default (unlike the undefined).


              12
            
let number = null;
console.log(number);

Task

Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.

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

Section 3. Chapter 30

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