Scala: Remove none elements from map and flatten

Question

I have a map:

Map(\"key1\" -> Some(\"value1\"), \"key2\" -> None, \"key3\" -> Some(\"value3\"))

I want to remove all None

Answer 1

My take using for comprehensions:

val m = Map("key1" -> Some("value1"), "key2" -> None, "key3" -> Some("value3"))
for( (key,value) <- m if(value.isDefined)) yield (key,value.get)