What are type guards in TypeScript?

What are type guards in TypeScript?

Type guards are a way to narrow down the type of a variable within a conditional block in TypeScript.

Can you give me an example of how to use a type guard?

Sure! Here's a simple example:

function isString(value: any): value is string {
    return typeof value === 'string';
}

const value: any = 'Hello, TypeScript!';
if (isString(value)) {
    console.log(value.toUpperCase()); // This is safe because we know value is a string.
}

What are the benefits of using type guards?

Type guards help improve type safety, reduce runtime errors, and enhance code readability by making type checks explicit.

Are there built-in type guards in TypeScript?

Yes, TypeScript has built-in type guards like typeof and instanceof that you can use to check types.