Impara 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:

if (boolean_expression)
{
   // some code here …
}

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");
}

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Sezione 1. Capitolo 32

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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:

if (boolean_expression)
{
   // some code here …
}

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");
}

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 1. Capitolo 32

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?

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?

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?

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?