In the past Arrow had function which worked like `...

# arrow

[nacyolsa]

In the past Arrow had function which worked like let with multiple variables. I think it was called zip() . What happened to it? It is mentioned here https://stackoverflow.com/questions/35513636/multiple-variable-let-in-kotlin#comment124559417_35522422 but docs were moved and I can't find it.

[Alejandro Serrano.Mena]

what would be your requirements? in general let + destructuring can get you a long way

Pair(3, "hello").let { (number, string) -> ... }

[nacyolsa]

I was looking for something similar to your example but with null safety

[Alejandro Serrano.Mena]

one solution in this case is to use a Raise block, something like:

fun Pair<A?, B?>.let(transform: (A, B) -> C): C? = nullable {
  val a = first.bind()
  val b = second.bind()
  transform(a, b)
}

[nacyolsa]

doesn't nullable use exceptions to handle nullable variables?

[Alejandro Serrano.Mena]

the internals indeed use exceptions in a controlled way

[phldavies]

It may also be worth pointing out that raise uses untraced exceptions (that is, no stacktrace is populated at instantiation) unless explicitly requested via traced {} so in this case there is very little overhead to the exception usage within nullable { }