Optionally adding items to a Scala Map

Question

I am looking for an idiomatic solution to this problem.

I am building a val Scala (immutable) Map and would like to optionally add one or more items:

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Answer 1

You can add directly to the map:

scala> val map = Map(1 -> 2, 3 -> 4)
scala> val some = Some(5 -> 6)
scala> val none = None
scala> val combinedMap = map ++ some ++ none
combinedMap: scala.collection.immutable.Map[Int,Int] = Map(1 -> 2, 3 -> 4, 5 -> 6)