On: Crystal 1.22

[flossly]

Kotlin has optional OOP on the JVM. I still use it, but sparingly. Barely ever classes inherit from other classes in my code; I use interfaces, mostly to be able to fake services for testing.

Most of what I write are functions and data objects (records, basically).

One pattern I use is classes with one function, where the constructor takes the functions dependencies, and the function only takes non-dependency parameters.

[pjmlp → flossly]

Functions and data objects are translated into OOP related JVM bytecodes.

Which is why, something like

    fun square(num: Int): Int = num * num

gets translated into

   public final class ExampleKt {
     public static final int square(int);
       0: iload_0
       1: iload_0
       2: imul
       3: ireturn
      }
    }

When running javap on the .class file.

People really should understand what they talk about avoiding OOP.