Contenu du cours

Introduction to JavaScript

1. Getting Started

First Javascript Console Application Challenge: Showing some Output Challenge: Outputing Multiple Lines Dealing with Numbers Challenge: Working with Numbers Challenge: Calculating the Speed of a Car Challenge: Calculating Area of a Trapezium Outputting Multiple Values Challenge: Consoling Meaningful Output How to Use Comments in Javascript?Challenge: Adding a Comment Multi-Line Comments Challenge: Commenting out Code What Is JavaScript anyway?

2. Manipulating Data

Storing Data Challenge: Declaring a Variable Challenge: Accessing Data From a Variable Challenge: Fixing Variable Names Challenge: Reassigning a Variable Constants Challenge: Declaring & Using Constants Performing Arithmetic On Variables Challenge: Making a Salary Calculator Challenge: Adjusting Salary with a Bonus Exploring Primitive Data Types Challenge: Declaring a Boolean Value How different Data Types Interact Challenge: Concatenating Strings Challenge: Creating User Profile & Activity Details

3. Conditional Statements

Comparison Operators Challenge: Checking Age Eligibility The `if` Statement Challenge: Weather-Based Outfit Recommender Challenge: Even or Odd Nested Conditional Statements The `else` Clause Challenge: Improving Even or Odd Checker Challenge: Temperature Advisor The `else if` Clause Challenge: Grade Categorizer ` AND` Logical Operator Challenge: Checking if a Number is Even and Positive OR Logical Operator Challenge: Accessing Control System

4. Mastering Functions

What Are Functions?Challenge: Simple Function Challenge: Calculating the Speed of a Car Scopes Passing Data into Functions Challenge: Fixing the Speed Function Challenge: Improving the Grade Categorizer Task: Defining a Compound Function Returning Data from Functions Default Values Challenge: Email Auto-Responder with Default Parameters

5. Exploring Arrays

What Are Arrays?Challenge: Defining An Array Challenge: Indexing Adding Values to an Array Challenge: Pushing Elements to an Array Removing Elements from an Array Challenge: Practicing `pop` & `shift`The `length` Property Challenge: Counting Elements The `includes` Method Challenge: Searching for Animals in the Zoo

6. Discovering Loops

The `for` Loop Task: Printing a Sequence The `while` Loop Challenge: Printing Fibonacci Sequence The `do-while` Loop Challenge: Random Multiple of 7 Using Loops with Arrays Challenge: Finding the Average Price of Items Summary

The `if` Statement

Definition

A conditional statement, also known as an if-statement, can be used to execute specific lines of code based on the result of a boolean expression.

The syntax of a conditional statement is:

js

Here boolean_expression can be any expression which defines a condition. The code between the curly brackets ({}) is executed if the boolean_expression evaluates to true.

Note

The code enclosed between the curly brackets ({}) is collectively referred to as a Code Block.

For example:


              12345
            
let age = 18;

if(age >= 18) {
  console.log("The user is old enough to drive.");
}

We can have multiple if-statements in a program, giving us more control over which code block to execute. For example, we can further extend the previous code to output a different statement if the age is less than 18:


              123456789
            
let age = 17;

if(age >= 18) {
    console.log("The user is old enough to drive.");
}

if(age < 18) {
    console.log("The user is not old enough to drive");
}

Tout était clair ?

Merci pour vos commentaires !

Section 3. Chapitre 3

Demandez à l'IA

Posez n'importe quelle question ou essayez l'une des questions suggérées pour commencer notre discussion

Contenu du cours

Introduction to JavaScript

1. Getting Started

2. Manipulating Data

3. Conditional Statements

4. Mastering Functions

5. Exploring Arrays

6. Discovering Loops

The `if` Statement

Definition

A conditional statement, also known as an if-statement, can be used to execute specific lines of code based on the result of a boolean expression.

The syntax of a conditional statement is:

js

Here boolean_expression can be any expression which defines a condition. The code between the curly brackets ({}) is executed if the boolean_expression evaluates to true.

Note

The code enclosed between the curly brackets ({}) is collectively referred to as a Code Block.

For example:


              12345
            
let age = 18;

if(age >= 18) {
  console.log("The user is old enough to drive.");
}


              123456789
            
let age = 17;

if(age >= 18) {
    console.log("The user is old enough to drive.");
}

if(age < 18) {
    console.log("The user is not old enough to drive");
}

Tout était clair ?

Merci pour vos commentaires !

Section 3. Chapitre 3

Introduction to JavaScript

The `if` Statement

1. What is a conditional statement used for in JavaScript?

2. What is the correct syntax for an `if` statement?

3. What will be the output of the following code?

Introduction to JavaScript

The `if` Statement

1. What is a conditional statement used for in JavaScript?

2. What is the correct syntax for an `if` statement?

3. What will be the output of the following code?

Introduction to JavaScript

The `if` Statement

1. What is a conditional statement used for in JavaScript?

2. What is the correct syntax for an if statement?

3. What will be the output of the following code?

Introduction to JavaScript

The `if` Statement

1. What is a conditional statement used for in JavaScript?

2. What is the correct syntax for an if statement?

3. What will be the output of the following code?

2. What is the correct syntax for an `if` statement?

2. What is the correct syntax for an `if` statement?