CODEWITHSUNDEEP
scala
Bob
Bob

Reputation: 661

Scala - Convert a Map with multiple keys into a flat List

I have a Map in Scala with two keys:-

scala> Map(("Alf", "111-111-111") -> 1)
res0: scala.collection.immutable.Map[(String, String),Int] = Map((Alf,111-111-111) -> 1)

I want to flatten this to create a List as below:-

List(Alf, 111-111-111, 1)

This seems a simple task, so I apologise in advance if the answer is obvious.

Upvotes: 0

Views: 647

Answers (3)

zhangde
zhangde

Reputation: 74

This also seems to work: 

Map(("Alf", "111-111-111") -> 1).flatMap(x => List(x._1._1, x._1._2, x._2))

Upvotes: 0

mkUltra
mkUltra

Reputation: 3078

Something like this?

Map(("Alf", "111-111-111") -> 1).flatMap { case ((fst, snd), value) => List(fst, snd, value) }

Upvotes: 2

Yaneeve
Yaneeve

Reputation: 4779

Map(("Alf", "111-111-111") -> 1).toList.flatMap(tup => tup._1.productIterator.toList :+ tup._2)

This would result in 

List[Any] = List(Alf, 111-111-111, 1)

I am not sure that that is what you actually want since you say you have a map with two keys and you don't. You have a map with one key which is a tuple of arity 2

Upvotes: 0

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