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 without repeating code.

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];
};

In this case, PartialUser has the same properties as User, but all are optional.

What are the benefits of using mapped types?

Mapped types help reduce redundancy in your code, improve type safety, and make it easier to maintain and refactor your codebase.

Are there any limitations to mapped types?

Yes, mapped types can only transform properties of existing types. They cannot add new properties or change the structure of the original type.