What are type assertions in TypeScript?

What are type assertions in TypeScript?

Type assertions are a way to tell the TypeScript compiler to treat a value as a specific type. It's like saying, 'I know better than you!'

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

Sure! If you have a variable let someValue: any = 'this is a string';, you can assert its type like this: let strLength: number = (someValue as string).length;

Are there different ways to assert types?

Yes, you can use the as syntax or the angle-bracket syntax. For example: let strLength: number = (<string>someValue).length; Both achieve the same result.

When should I use type assertions?

Use type assertions when you are certain about the type of a value but TypeScript cannot infer it. However, use them sparingly to maintain type safety.