[stefs]

But there's a real difference how easy it is to write crappy code in a language. In regards to java that'd be, for example, nullability, or mutability. Kotlin, in comparison, makes those explicit and eliminates some pain points. You'd have to go out of your way and make your code actively worse for it to be on the same level as the same java code.

And then there's a reason they're teaching the "functional core, imperative shell" pattern.

[fiddlerwoaroof]

On the other hand, Java's tooling for correctly refactoring at scale is pretty impressive: using IntelliJ, it's pretty tractable to unwind quite a few messes using automatic tools in a way that's hard to match in many languages that are often considered better.

[throwaway2037]

I agree with your point, and I want to second C# and JetBrains Rider here. Whatever refactoring you can with Java in JetBrains IntelliJ, you can do the same with C#/Rider. I have worked on multiple code bases in my career that were 100sK lines of Java and/or C#. Having a great IDE experience was simply a miracle.

[stefs]

The language Kotlin is actually developed by JetBrains

[fiddlerwoaroof]

I've found that IntelliJ's refactorings don't work as well for Kotlin as Java but, also, I've avoided Kotlin because I don't like it very much.