Question

How to avoid to wrap args when implementing a def with pattern matching ?

Examples :

def myDef(a: A, b:B, c: C): D = (a,c,d) match {
  case ('qsdqsd, _ , _ ) => ???
  case _ => ???
}

Answer 1

You can take the tuple as the function argument instead:

def myDef(abc: (A,B,C)): D = abc match {
  case ('qxpf, _, _) => ???
  case _ => ???
}

Users will have their non-tuple argument lists automatically promoted into tuples. Observe:

scala> def q(ab: (Int,String)) = ab.swap
q: (ab: (Int, String))(String, Int)

scala> q(5,"Fish")
res1: (String, Int) = (Fish,5)