What are mapped types in TypeScript and how can I use them in React?

What are mapped types in TypeScript and how can I use them in React?

Mapped types in TypeScript allow you to create new types by transforming properties of existing types. In React, you can use them to create more flexible and reusable components.

Can you give me an example of a mapped type?

Sure! For instance, if you have a type User with properties name and age, you can create a mapped type that makes all properties optional like this: type PartialUser = { [K in keyof User]?: User[K] };.

How would I use this in a React component?

You can use the mapped type as a prop type in your component. For example, const MyComponent: React.FC<PartialUser> = ({ name, age }) => { ... } allows you to pass in a user object with optional properties.

Are there any limitations to using mapped types?

Yes, mapped types can only transform properties of existing types. They can't add new properties or change the types of existing ones beyond what's defined in the original type.