add old scala exercises

PipelineTest.scala

@@ -0,0 +1,18 @@
+object Pipelining {
+  implicit def toPipe[T](x : T) = new { def |> [U](f : T => U) = f(x) }
+}
+
+object PipelineTest extends App {
+
+  def minusTen(x: Int) = x-10
+
+  def timesTwo(x: Int) = x*2
+
+  assert(minusTen(timesTwo(3)) == -4)
+
+  val f = timesTwo _ andThen minusTen _
+  assert(f(3) == -4)
+
+  val g = timesTwo compose minusTen
+  assert(g(3) == -4)
+}

ScalaFXHello.scala

@@ -0,0 +1,23 @@
+import scalafx.Includes._
+import scalafx.application.JFXApp
+import scalafx.scene.Scene
+import scalafx.scene.paint.Color
+import scalafx.scene.shape.Rectangle
+
+object ScalaFXHello extends JFXApp {
+  stage = new JFXApp.PrimaryStage {
+    title.value = "Hello Stage"
+    width = 600
+    height = 450
+    scene = new Scene {
+      fill = Color.LightGreen
+      content = new Rectangle {
+        x = 25
+        y = 40
+        width = 100
+        height = 100
+        fill <== when (hover) choose Color.Green otherwise Color.Red
+      }
+    }
+  }
+}

lazyvals.scala

@@ -0,0 +1,19 @@
+// http://daily-scala.blogspot.de/2009/09/lazy-val.html
+
+object Lazyvals extends App {
+  val normalVal = {
+    println("---->>>   Initializing normal val    <<<----");
+    "This is the normal val"
+  }
+  lazy val lazyVal = {
+    println("---->>>   Initializing lazy val   <<<----");
+    "This is the lazy val"
+  }
+  println("\n\nno references have been made yet\n\n")
+  println("Accessing normal val : ")
+  println(normalVal)
+  println("\n\nAccessing lazy val : ")
+  println(lazyVal)
+  println("\n\nAccessing lazy val a second time, there should be no initialization now: ")
+  println(lazyVal)
+}