What is the difference between TypeScript types and annotations?

What is the difference between TypeScript types and annotations?

TypeScript types define the shape of data, while annotations are used to specify types explicitly in your code.

Can you give me an example of a type and an annotation?

Sure! A type could be defined as type User = { name: string; age: number; }, while an annotation could be let user: User;.

When should I use types instead of annotations?

Use types when you want to create reusable type definitions, and annotations for explicit type declarations in variables.

Are there any performance differences between using types and annotations?

No, both types and annotations are used at compile time and do not affect runtime performance.