I mean, I want use a default placeholder if either the passed string “currentUser?.firstName” or “cu...

# android

[Ofir Bar]

I mean, I want use a default placeholder if either the passed string “currentUser?.firstName” or “currentUser?.lastName” to getString() is null.

Can I use this with elvis?
I couldn’t find a way (unless using if/else,etc, just exploring something more clean)

[Leon K]

so what you're asking for is a way to do one elvis on a pair of nullable values, right? like use both if both are non-null, but use a default if any one is null.

this is a currently unsolved problem (at least by the stdlib), where you do have to use some kind of if, list, or something.

What you want is a function from pair of Nullable to Nullable pair.
you can define something like this in kotlin yourself:

fun <A, B> Pair<A?, B?>.liftNullability(): Pair<A, B>? = if (first != null && second != null) Pair(first!!, second!!) else null

[Ofir Bar]

Exactly, thank you Leon @Leon K

btw, what did you mean by list?

[Leon K]

you could use lists containing your nullable values, then do the following:

listOf(nullable1, nulalble2).all { it != null }.filterNotNull().let { values -> doSomething(values[0], values[1])}

but please never do this, it's inefficient and extremely error prone

[Ofir Bar]

Agree, I usually ask just to train the brain 🙂
Other developer might get depressed trying to read my code lol