Type Classes in Kotlin?

[BruceEckel]

Does Kotlin support type classes in any way? If so, can someone point me to an example? Thanks!

[abreslav]

Kotlin doesnot support type classes at the moment. In fact, there's no clear plan regarding this, in particular, type classes will not be supported in the version 1

[BruceEckel]

Thanks for clarifying. Although I do enjoy type classes in Scala, they are a little obscure in the implementation and I would hope that Kotlin makes it easier if it implements them. In any event, type classes are the last chapter in Atomic Scala so it's easy to leave them off.

[cedricbeust]

FYI, I just posted a few thoughts on this topic:

"Extension types" for Kotlin

Nat wrote a good summary of Kotlin on his blog recently and this remark in particular: However, there’s no way to write a generic function that sums its parameters, because add is not defined on an interface that can be used as an upper bound. I wonder if we could extend the concept of “extension functions” to types (“extension types”?). For example, I could define an adder interface: interface Addable<T> { fun add(a: T, b: T) } and then specify that the existing class Int implements A…

[Raul.Raja.Martinez]

There is now a KEEP for type classes for those of you interested Compile-time Extension Interfaces by raulraja · Pull Request #87 · Kotlin/KEEP · GitHub