First idea:

seq.filter(_.isDefined).map(_.get)


Second solution from StackOverFlow

seq.flatMap(x=>x)


Overkill solution:

class NonePurger[T] (val seq:Iterable[Option[T]]) {
def purgeNone():Iterable[T] = seq.flatMap(x=>x);
}
implicit def iterableOption2NonePurger[T](seq:Iterable[Option[T]]):NonePurger[T] = new NonePurger(seq);
seq.purgeNone

That's a list of libraries/DSLs for Scala that I'm interested in and want to try out in upcoming project.

• XScalaWT
  Provide a DSL for programming SWT Dialogs. Main benefit: strong Strong type checking. No need for additional tool/language
• Lift
  THE framework for web development with Scala. Book available:The Lift Book
• Scala Query
  Think of LINQ or "A Type-Safe Database Query DSL for Scala"
• ScalaCheck
  Port of QuickCheck for Haskell + additions.
• Scala Modules
  Aim to ease handling of OSGI in form of a DSL.

import com.trolltech.qt.gui._

object Application {
def main(args : Array[String]) : Unit = {
val app = new QApplication(args);
val button = new QPushButton("Hello");
button.show;
button.clicked.connect(app, "aboutQt()");
System.exit(QApplication.exec);
}
}