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

Another possibility is to take advantage of the iterable nature of Option.

A non-empty value o:

scala> val o = Some('z' -> 3)
scala> (Seq('x' -> 1, 'y' -> 2) ++ o).toMap
res1: scala.collection.immutable.Map[Char,Int] = Map(x -> 1, y -> 2, z -> 3)

An empty value o:

scala> val o = None
scala> (Seq('x' -> 1, 'y' -> 2) ++ o).toMap
res2: scala.collection.immutable.Map[Char,Int] = Map(x -> 1, y -> 2)