What are mapped types in TypeScript?
An example of an AI chatbot conversation about TypeScript mapped types.
What are mapped types in TypeScript?
Mapped types in TypeScript allow you to create new types by transforming properties of existing types. They use the syntax { [K in keyof T]: U }.
Can you give me an example of a mapped type?
Sure! For instance, if you have a type Person with properties name and age, you can create a mapped type that makes all properties optional like this: type PartialPerson = { [K in keyof Person]?: Person[K] };.
What are some use cases for mapped types?
Mapped types are useful for creating variations of existing types, such as making properties optional, readonly, or transforming types for API responses.
Are there any limitations to using mapped types?
Yes, mapped types can only transform properties of existing types and cannot add new properties. Also, they cannot be used with union types directly.
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