Using Kotlin from Java, you almost don't realize how big of a deal it is just how seamless the interop really is. I've been spending a while trying to get comfortable with Kotlin/JS, and it really puts things in perspective. Kotlin/JS works very well in isolation, but getting it to play nicely with existing libraries and tooling just isn't very clean or easy, and it really does feel like a young language in contrast to the maturity of Kotlin/JVM.
Definitely. I feel like, in JS world, a bit different patterns are usually used. When I write front-end code with Kotlin, I actually avoid using libraries at all, so that I can have nice architecture. And Kotlin stdlib gives me a lot already.
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