The Kotlin koans are very good: https://play.kotlinlang.org/koans/overview

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I pointed him at the koans but I think he wants something a little more basic and tutorial like

Maybe he can try the Koans? https://play.kotlinlang.org/koans/overview

I’ve heard the Koans are good. But in all seriousness, check out this book. https://pragprog.com/book/vskotlin/programming-kotlin

Thanks

i feel like a book that talks about how to write performant JVM applications is maybe a bit too much for someone who hasn’t ever written a JVM application

Sorry I was reading in diagonal HAHA 😄

I’ve read the book, and think it moves slowly enough for an existing developer to get up to speed with Kotlin. It assumes some programming experience, but not with Kotlin. I think the byline is more to appeal to a larger audience as he does cover a lot.