Check if a string is blank or doesn't exist in Scala

Question

I have an Option[String].

I want to check if there is a string exists and if it\'s exists its not blank.

def isBlank( input : Option[Strin         


        

Answer 1

You can also take advantage of Extractor pattern. It makes codes much more declarative.

For example:

object NonBlank {
  def unapply(s: String): Option[String] = Option(s).filter(_.trim.nonEmpty) 
}

And then use it like

def createUser(name: String): Either[Error, User] = name match {
  case NonBlank(username) => Right(userService.create(username))
  case _ => Left(new Error("Invalid username. Blank usernames are not allowed."))
}