I think for Kotlin learning FP background is even ...

# getting-started

[nil2l]

I think for Kotlin learning FP background is even better than Java.

[edwardwongtl]

I don't think so...Kotlin uses a lot of Java's core functions, and is meant to be coop with Java, so I think the knowledge of Java is very important for one to use Kotlin effectively.
Even the Kotlin stdlib is a huge set of extension to Java's core lib, so...