Scala way of if else with two conditional variables

Question

I have a the following Java snippet (where a and b are futures):

if (a.isEmpty && b.isEmpty) func(list)
else if (a.isEmpty) func(list, b)
else if (b.isEmpty) func(a, list)
else func(a, list, b)

I have all the implementations of the function 'func'. Is there a proper way to write this in Scala or is this good enough?

I am extending an existing class which already have the implementations. — NPK, Aug 04 '16 at 20:50
Under the assumption that a and b are not equal to the type of list it's typesafe and conform for overloading. — sascha10000, Aug 04 '16 at 21:14
It's type safe even if they are all the same type. There are three overloads, taking one, two and three arguments of the same type. — The Archetypal Paul, Aug 04 '16 at 21:15

score 1 · Answer 1 · answered Aug 04 '16 at 21:15

1

Assuming a and b are lists, which seems likely as they seem related to list:

(a, b) match {
  case (Nil, Nil) => func(list)
  case (Nil, _)   => func(list, b)
  case (_, Nil)   => func(a, list)
  case _          => func(a, b, list)
}

answered Aug 04 '16 at 21:15

The Archetypal Paul

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actually they are Futures – NPK Aug 04 '16 at 21:49
Ok. Kind of useful for you to have everything said that earlier! – The Archetypal Paul Aug 04 '16 at 21:57
I'm not sure about the meaning of `isEmpty` if `a` and `b` are Futures. – stefanobaghino Aug 05 '16 at 08:59
Are you sure they're not lists of Futures? `Future` doesn't have an `isEmpty` method – The Archetypal Paul Aug 05 '16 at 16:53

Scala way of if else with two conditional variables

1 Answers1