for..else for Option types in Scala?

davetron5000_3029 0
Viewed 3637

Suppose I have two Options and, if both are Some, execute one code path, and if note, execute another. I'd like to do something like

for (x <- xMaybe; y <- yMaybe) {
  // do something
}
else {
  // either x or y were None, handle this
}

Outside of if statements or pattern matching (which might not scale if I had more than two options), is there a better way of handling this?

for-comprehension scala monads
9 Answers

Starting Scala 2.13, we can alternatively use Option#zip which concatenates two options to Some tuple of their values if both options are defined or else None:

opt1 zip opt2 match {
  case Some((x, y)) => "x and y are there"
  case None         => "x and/or y were None"
}

Or with Option#fold:

(opt1 zip opt2).fold("x and/or y were None"){ case (x, y) => "x and y are there" }
user_92971440
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