How to allow mkString to skip null in scala?

Question

scala> Seq("abc", null).mkString(" ") res0: String = abc null 

but I want to get only "abc"

Is there a scala way to skip zeros?

Answer 1

 scala> val seq = Seq("abc", null, "def") seq: Seq[String] = List(abc, null, def) scala> seq.flatMap(Option[String]).mkString(" ") res0: String = abc def 

Answer 2

Always Seq("abc", null).filter(_ != null).mkString(" ")

Answer 3

A combination of Rex's answer and Eric's first comment:

 Seq("abc", null).map(Option(_)).collect{case Some(x) => x}.mkString(" ") 

The first map wraps the values ​​leading to Seq[Option[String]] . collect , essentially filter and map , discarding the None values ​​and leaving only the expanded values ​​of Some .