What are optional parameters in JavaScript?

What are optional parameters in JavaScript?

Optional parameters in JavaScript allow you to define function parameters that can be omitted when calling the function.

Can you give me an example of how to use optional parameters?

Sure! Here's a simple example:

function greet(name, greeting = 'Hello') {
    return `${greeting}, ${name}!`;
}

console.log(greet('Alice')); // Output: Hello, Alice!
console.log(greet('Bob', 'Hi')); // Output: Hi, Bob!

What happens if I don't provide an optional parameter?

If you don't provide an optional parameter, it will take the default value specified in the function definition.

Are there any limitations to using optional parameters?

Yes, one limitation is that you can't skip optional parameters in the middle of the parameter list without providing undefined for them.