Question

I want to check if a Map doesn’t contain empty values. If the value is empty it shouldn’t includen in the new Map.

I tried something like:

val newmap = map.map{ entry => if(!entry._2.isEmpty()) Map(entry._1 -> entry._2)}

This does exactly do what I want, but it is not very nice. Is there a better solution?

Answer 1

scala> Map(1 -> List(3, 4), 2 -> Nil, 3 -> List(11))
res2: scala.collection.immutable.Map[Int,List[Int]] = Map(1 -> List(3, 4), 2 -> List(), 3 -> List(11))

scala> res2.filter(_._2.nonEmpty)
res3: scala.collection.immutable.Map[Int,List[Int]] = Map(1 -> List(3, 4), 3 -> List(11))

scala>