What are mapped types in TypeScript?

What are mapped types in TypeScript?

Mapped types in TypeScript allow you to create new types by transforming properties of existing types. They are useful for creating variations of types based on existing ones.

Can you give me an example of a mapped type?

Sure! For instance, you can create a mapped type that makes all properties of an existing type optional. Here's an example:

type User = { id: number; name: string; };

type PartialUser = { [K in keyof User]?: User[K]; };

What are the benefits of using mapped types?

Mapped types help in reducing code duplication, improving type safety, and making your code more maintainable by allowing you to derive new types from existing ones.

Are there any limitations to mapped types?

Yes, mapped types cannot change the property types or add new properties; they can only transform existing ones.