What are some examples of type assertions in TypeScript?

What are some examples of type assertions in TypeScript?

Type assertions in TypeScript allow you to override the inferred type of a variable. For example, you can use the as keyword or angle-bracket syntax.

Can you show me a specific example using the as keyword?

Sure! Here's an example: let someValue: any = 'this is a string'; let strLength: number = (someValue as string).length; This asserts that someValue is a string.

What about using angle-bracket syntax?

Absolutely! You can write it like this: let someValue: any = 'this is a string'; let strLength: number = (<string>someValue).length; Both methods achieve the same result.

Are there any risks associated with type assertions?

Yes, using type assertions can lead to runtime errors if you're not careful. It bypasses TypeScript's type checking, so ensure the assertion is valid.