What are if-else statements in JavaScript?

Can you explain what if-else statements are in JavaScript?

Sure! If-else statements are used to perform different actions based on different conditions. They allow you to execute a block of code if a specified condition is true, and another block of code if it is false.

Can you give me an example of how to use an if-else statement?

Of course! Here's a simple example:

let age = 18;
if (age >= 18) {
    console.log('You are an adult.');
} else {
    console.log('You are a minor.');
}

In this case, if the age is 18 or older, it will print 'You are an adult.' Otherwise, it will print 'You are a minor.'

What happens if I have multiple conditions?

You can use else if to check multiple conditions. For example:

let score = 85;
if (score >= 90) {
    console.log('Grade: A');
} else if (score >= 80) {
    console.log('Grade: B');
} else {
    console.log('Grade: C');
}

This checks the score and assigns a grade based on the value.

Are there any best practices for using if-else statements?

Yes! Keep your conditions simple, avoid deep nesting, and consider using switch statements for multiple conditions when appropriate.