Scala 3 FAQ: How does 'derives' work? (Notes on type classes, derivation macros, and compile-time derivation)

In Scala 3, the derives keyword allows for automatic generation of type class implementations, making it particularly useful in libraries like ZIO JSON for JSON encoding.

The derives JsonEncoder component simplifies the process of converting instances of case classes into JSON, eliminating the need for manual implementation of encoding logic.

Using derives, Scala can automatically create a JSON representation based on the case class structure, mapping each field to its corresponding JSON key-value pair.

By utilizing Scala 3's metaprogramming capabilities, libraries such as ZIO JSON can leverage macros to automatically derive type classes, reducing boilerplate code for developers.

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