Pangrams for HackerRank

Pangrams.scala

 def isPangram(strings: Array[String]): String = {
       val values=for{
         string<-strings
         set=string.toLowerCase().toSet
         isPangram=('a' to 'z').forall(set.contains)
       } yield if (isPangram) 1 else 0
       values.mkString 
    }