Hi, how are `generator-scripts/tuple.generator.kt...

# arrow

[Stefan]

Hi, how are generator-scripts/tuple.generator.kts run in the arrow build? I'd like to add mapN to nullable tuples

[simon.vergauwen]

It has not been used in a long time anymore, and it should be removed. We’ve been manually implementing stuff in tuples directly for a while already.

[simon.vergauwen]

What do you mean with nullable tuples?

[simon.vergauwen]

Those files can be run as Kotlin Scripts.

[Stefan]

like

internal fun <A, B, R> Pair<A?, B?>.mapN(f: (A, B) -> R): R? =
      first?.let { first_ ->
        second?.let { second_ ->
          f(first_, second_)
        }
      }

[simon.vergauwen]

You can use Nullable.zip although it’s a little bit less convenient.

Nullable.zip(
  pair.first,
  pair.second
) { a, b -> ... }

[simon.vergauwen]

It’s an n-arity DSL for avoiding nested ?.let

[simon.vergauwen]

There is also nullable { } which allows to call fun A?.bind(): A

[Stefan]

cool. This is what I was looking for

[Stefan]

thanks