Scala Option *will* save you from NullPointerException

SafeUnsafe.scala

class SafeUnsafe {

  def unsafe[T](x: =>T):Option[T]=
    try {
      Option(x)
    } catch {
      case _ => None
    }


  def A(x:Int) = x+10
  def B(x:Int) = x.toString
  def C(s:String)=s+"!"
  def D(s:String)="Hell yeah, "+s

  def KaPow(s:String):String= throw new Exception("KaPow!")

  def result(i:Int)=for (
    a<- unsafe(A(i));
    b<- unsafe(B(a));
    c<- unsafe(C(b))
  ) yield D(c)


  def noResult(i:Int)= for (
    a<- unsafe(A(i));
    b<- unsafe(B(a));
    k<- unsafe(KaPow(b));
    c<- unsafe(C(k))
  ) yield D(c)

//scala> result(1)
//res10: Option[java.lang.String] = Some(Hell yeah, 11!)

//scala> noResult(1)
//res11: Option[java.lang.String] = None

}

SAfeUnsafeWithEither.scala

class SafeUnsafe {

  def unsafe[T](x: =>T):Option[T]=
    try {
      Option(x)
    } catch {
      case _ => None
    }


  def A(x:Int) = x+10
  def B(x:Int) = x.toString
  def C(s:String)=s+"!"
  def D(s:String)="Hell yeah, "+s

  def KaPow(s:String):String= throw new Exception("KaPow!")

  def result(i:Int)=for (
    a<- unsafe(A(i));
    b<- unsafe(B(a));
    c<- unsafe(C(b))
  ) yield D(c)


  def noResult(i:Int)= for (
    a<- unsafe(A(i));
    b<- unsafe(B(a));
    k<- unsafe(KaPow(b));
    c<- unsafe(C(k))
  ) yield D(c)

//scala> result(1)
//res10: Option[java.lang.String] = Some(Hell yeah, 11!)

//scala> noResult(1)
//res11: Option[java.lang.String] = None

}