What are some practical use cases for mapped types in TypeScript?

What are some practical use cases for mapped types in TypeScript?

Mapped types in TypeScript allow you to create new types by transforming existing ones. They are useful for scenarios like creating a type that makes all properties optional or readonly.

Can you give me an example of how to create a mapped type?

Sure! For instance, you can create a mapped type that makes all properties of an interface optional like this: type Partial<T> = { [P in keyof T]?: T[P] };.

What about using mapped types with utility types?

Absolutely! Mapped types can be combined with utility types like Pick or Omit to create more complex types. For example, you can use Omit to exclude certain properties from a mapped type.

Are there any limitations to using 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.