What are function parameters in TypeScript?

What are function parameters in TypeScript?

Function parameters in TypeScript are variables listed as part of a function's definition. They allow you to pass data into functions.

Can you give me an example of a function with parameters?

Sure! Here's a simple example:

function greet(name: string): string {
    return `Hello, ${name}!`;
}

In this case, name is a parameter of type string.

What happens if I don't provide a parameter?

If a parameter is required and you don't provide it, TypeScript will throw a compilation error. You can make parameters optional by using a question mark, like this: name?: string.

Can I have default values for parameters?

Yes! You can set default values for parameters. For example:

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

If no argument is passed, it will use 'Guest' as the default.