if i have a few functions that have a default argu...

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[william]

if i have a few functions that have a default argument of onComplete: () -> Unit = {} would it be best to put this no-op function in a companion object somewhere or does kotlin automatically do any optimizations ?

[karelpeeters]

A quick look at the generated bytecode for

fun foo(block: () -> Unit) {
    block()
}

fun main() {
    foo {}
    foo {}
}

shows that there's not much optimization happening here, two separate classes are created to represent the {}. You can try looking at your exact case too.

[william]

@karelpeeters how do you look at the generated bytecode like that?

[karelpeeters]

Tools > Kotlin > Show Kotlin Bytecode (> Decompile, kind of buggy)