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 pattern matching is:

Map("key1" -> Some("value1"), "key2" -> None, "key3" -> Some("value3")).collect {
  case (key, Some(value)) => key -> value
}
// Map(key1 -> value1, key3 -> value3)

Collect acts like combined map + filter