Passing a parameter to a function only if not null

Question

I need to pass a nullable parameter to a function that only accepts non nullable objects, but has a default value defined.

Currently I'm using a let:

fun myFun(a:String = "qqq"): Whatever {...}

val myString:String? = getNullableString()

val myFunResult = myString.?let{myFun(it)}?:myFun()

This is verbose and it is no more possible when there's more than an optional parameter. I'd need something like

val myFunResult = myFun(myString?:default)

Is there a pratical way to do this?

Answer 1

If you don't want to repeat the default value outside of the function (I wouldn't) you are going to have to do some kind of conditional check. Personally speaking, I find the let expression hard to read when scanning code, and would probably just go with an if. Keep in mind that in Kotlin, if is an expression:

if(myString == null) myFun() else myFun(myString)