4 ms·

Unless I'm not undersranding this correctly. This is basically 'zip' in most functional programming languages.

• almostzip 7y ago
  Indeed. However in Scala at least zip ends up giving you a List instead of an Option. for {} yield seems to do the trick scala> val a = Some("A") a: Some[String] = Some(A) scala> val b = Some(1) b: Some[Int] = Some(1) scala> val b2 = None b2: None.type = None scala> for { x <- a; y <- b } yield (x,y) res1: Option[(String, Int)] = Some((A,1)) scala> for { x <- a; y <- b2 } yield (x,y) res2: Option[(String, Nothing)] = None scala> a zip b res3: Iterable[(String, Int)] = List((A,1)) scala> a zip b2 res4: Iterable[(String, Nothing)] = List()