Random Thoughts and Links : Rubrik:Scala

Converting Seq[Option[Any]]) to Seq[Any] and removing None values in Scala

randomike — 2009-07-17T09:35:00Z

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

Scala Libraries and DSLs

randomike — 2009-03-20T14:05:00Z

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.

Scala und QtJambi

randomike — 2008-11-15T18:46:00Z

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);
}
}