A taste of using implicits in scala

	package implicits
	import java.io.File
	object ImplicitsDemo {
	trait Composite[T] {
	def value: T
	def isComposite: Boolean
	def children: List[Composite[T]]
	def descendants: List[Composite[T]] =
	children.map(child => child +: (if (child.isComposite) child.descendants else Nil)).flatten
	def print: Unit = print(0)
	def print(level: Int): Unit = {
	val indent = " " * level
	println(indent + "|_" + this)
	if (isComposite) children.foreach(_.print(level + 1))
	}
	}
	implicit def fileToComposite(file: File): Composite[File] = new Composite[File] {
	def value: File = file
	override def isComposite = file.isDirectory()
	override def children: List[Composite[File]] = file.listFiles().toList.map(fileToComposite)
	override def toString = file.getName()
	}
	def main(args: Array[String]): Unit = {
	println("*********************printing descendants**************************************************")
	new File("C:/scala-2.10.2").descendants.foreach(composite => println(composite.value.getAbsolutePath()))
	println("*********************printing descendants as TREE ******************************************")
	new File("C:/scala-2.10.2").print
	}
	}
	/**
	*********************printing descendants**************************************************
	C:\scala-2.10.2\bin
	C:\scala-2.10.2\bin\fsc
	C:\scala-2.10.2\bin\fsc.bat
	C:\scala-2.10.2\bin\scala
	C:\scala-2.10.2\bin\scala.bat
	C:\scala-2.10.2\bin\scalac
	C:\scala-2.10.2\bin\scalac.bat
	C:\scala-2.10.2\bin\scaladoc
	C:\scala-2.10.2\bin\scaladoc.bat
	C:\scala-2.10.2\bin\scalap
	C:\scala-2.10.2\bin\scalap.bat
	C:\scala-2.10.2\doc
	C:\scala-2.10.2\doc\LICENSE
	C:\scala-2.10.2\doc\README
	C:\scala-2.10.2\doc\tools
	C:\scala-2.10.2\doc\tools\css
	C:\scala-2.10.2\doc\tools\css\style.css
	C:\scala-2.10.2\doc\tools\fsc.html
	C:\scala-2.10.2\doc\tools\images
	C:\scala-2.10.2\doc\tools\images\external.gif
	C:\scala-2.10.2\doc\tools\images\scala_logo.png
	C:\scala-2.10.2\doc\tools\index.html
	C:\scala-2.10.2\doc\tools\scala.html
	C:\scala-2.10.2\doc\tools\scalac.html
	C:\scala-2.10.2\doc\tools\scaladoc.html
	C:\scala-2.10.2\doc\tools\scalap.html
	C:\scala-2.10.2\examples
	C:\scala-2.10.2\examples\actors
	C:\scala-2.10.2\examples\actors\auction.scala
	C:\scala-2.10.2\examples\actors\boundedbuffer.scala
	C:\scala-2.10.2\examples\actors\channels.scala
	C:\scala-2.10.2\examples\actors\fringe.scala
	C:\scala-2.10.2\examples\actors\links.scala
	C:\scala-2.10.2\examples\actors\looping.scala
	C:\scala-2.10.2\examples\actors\message.scala
	C:\scala-2.10.2\examples\actors\pingpong.scala
	C:\scala-2.10.2\examples\actors\producers.scala
	C:\scala-2.10.2\examples\actors\seq.scala
	C:\scala-2.10.2\examples\boundedbuffer.scala
	C:\scala-2.10.2\examples\computeserver.scala
	C:\scala-2.10.2\examples\fors.scala
	C:\scala-2.10.2\examples\futures.scala
	C:\scala-2.10.2\examples\gadts.scala
	C:\scala-2.10.2\examples\iterators.scala
	C:\scala-2.10.2\examples\maps.scala
	C:\scala-2.10.2\examples\monads
	C:\scala-2.10.2\examples\monads\callccInterpreter.scala
	C:\scala-2.10.2\examples\monads\directInterpreter.scala
	C:\scala-2.10.2\examples\monads\errorInterpreter.scala
	C:\scala-2.10.2\examples\monads\simpleInterpreter.scala
	C:\scala-2.10.2\examples\monads\stateInterpreter.scala
	C:\scala-2.10.2\examples\oneplacebuffer.scala
	C:\scala-2.10.2\examples\package.scala
	C:\scala-2.10.2\examples\parsing
	C:\scala-2.10.2\examples\parsing\ArithmeticParser.scala
	C:\scala-2.10.2\examples\parsing\ArithmeticParsers.scala
	C:\scala-2.10.2\examples\parsing\JSON.scala
	C:\scala-2.10.2\examples\parsing\lambda
	C:\scala-2.10.2\examples\parsing\lambda\Main.scala
	C:\scala-2.10.2\examples\parsing\lambda\test
	C:\scala-2.10.2\examples\parsing\lambda\test\test-01.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-02.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-03.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-04.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-05.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-06.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-07.kwi
	C:\scala-2.10.2\examples\parsing\lambda\test\test-08.kwi
	C:\scala-2.10.2\examples\parsing\lambda\TestParser.scala
	C:\scala-2.10.2\examples\parsing\lambda\TestSyntax.scala
	C:\scala-2.10.2\examples\parsing\ListParser.scala
	C:\scala-2.10.2\examples\parsing\ListParsers.scala
	C:\scala-2.10.2\examples\parsing\MiniML.scala
	C:\scala-2.10.2\examples\patterns.scala
	C:\scala-2.10.2\examples\sort.scala
	C:\scala-2.10.2\examples\sort1.scala
	C:\scala-2.10.2\examples\sort2.scala
	C:\scala-2.10.2\examples\tcpoly
	C:\scala-2.10.2\examples\tcpoly\monads
	C:\scala-2.10.2\examples\tcpoly\monads\Monads.scala
	C:\scala-2.10.2\examples\xml
	C:\scala-2.10.2\examples\xml\phonebook
	C:\scala-2.10.2\examples\xml\phonebook\embeddedBook.scala
	C:\scala-2.10.2\examples\xml\phonebook\phonebook.scala
	C:\scala-2.10.2\examples\xml\phonebook\phonebook1.scala
	C:\scala-2.10.2\examples\xml\phonebook\phonebook2.scala
	C:\scala-2.10.2\examples\xml\phonebook\phonebook3.scala
	C:\scala-2.10.2\examples\xml\phonebook\verboseBook.scala
	C:\scala-2.10.2\lib
	C:\scala-2.10.2\lib\akka-actors.jar
	C:\scala-2.10.2\lib\diffutils.jar
	C:\scala-2.10.2\lib\jline.jar
	C:\scala-2.10.2\lib\scala-actors-migration.jar
	C:\scala-2.10.2\lib\scala-actors.jar
	C:\scala-2.10.2\lib\scala-compiler.jar
	C:\scala-2.10.2\lib\scala-library.jar
	C:\scala-2.10.2\lib\scala-partest.jar
	C:\scala-2.10.2\lib\scala-reflect.jar
	C:\scala-2.10.2\lib\scala-swing.jar
	C:\scala-2.10.2\lib\scalap.jar
	C:\scala-2.10.2\lib\typesafe-config.jar
	C:\scala-2.10.2\man
	C:\scala-2.10.2\man\man1
	C:\scala-2.10.2\man\man1\fsc.1
	C:\scala-2.10.2\man\man1\scala.1
	C:\scala-2.10.2\man\man1\scalac.1
	C:\scala-2.10.2\man\man1\scaladoc.1
	C:\scala-2.10.2\man\man1\scalap.1
	C:\scala-2.10.2\misc
	C:\scala-2.10.2\misc\scala-devel
	C:\scala-2.10.2\misc\scala-devel\plugins
	C:\scala-2.10.2\misc\scala-devel\plugins\continuations.jar
	C:\scala-2.10.2\src
	C:\scala-2.10.2\src\fjbg-src.jar
	C:\scala-2.10.2\src\msil-src.jar
	C:\scala-2.10.2\src\scala-actors-src.jar
	C:\scala-2.10.2\src\scala-compiler-src.jar
	C:\scala-2.10.2\src\scala-library-src.jar
	C:\scala-2.10.2\src\scala-partest-src.jar
	C:\scala-2.10.2\src\scala-reflect-src.jar
	C:\scala-2.10.2\src\scala-swing-src.jar
	C:\scala-2.10.2\src\scalap-src.jar
	********************* printing file as TREE ******************************************
	|_scala-2.10.2
	|_bin
	|_fsc
	|_fsc.bat
	|_scala
	|_scala.bat
	|_scalac
	|_scalac.bat
	|_scaladoc
	|_scaladoc.bat
	|_scalap
	|_scalap.bat
	|_doc
	|_LICENSE
	|_README
	|_tools
	|_css
	|_style.css
	|_fsc.html
	|_images
	|_external.gif
	|_scala_logo.png
	|_index.html
	|_scala.html
	|_scalac.html
	|_scaladoc.html
	|_scalap.html
	|_examples
	|_actors
	|_auction.scala
	|_boundedbuffer.scala
	|_channels.scala
	|_fringe.scala
	|_links.scala
	|_looping.scala
	|_message.scala
	|_pingpong.scala
	|_producers.scala
	|_seq.scala
	|_boundedbuffer.scala
	|_computeserver.scala
	|_fors.scala
	|_futures.scala
	|_gadts.scala
	|_iterators.scala
	|_maps.scala
	|_monads
	|_callccInterpreter.scala
	|_directInterpreter.scala
	|_errorInterpreter.scala
	|_simpleInterpreter.scala
	|_stateInterpreter.scala
	|_oneplacebuffer.scala
	|_package.scala
	|_parsing
	|_ArithmeticParser.scala
	|_ArithmeticParsers.scala
	|_JSON.scala
	|_lambda
	|_Main.scala
	|_test
	|_test-01.kwi
	|_test-02.kwi
	|_test-03.kwi
	|_test-04.kwi
	|_test-05.kwi
	|_test-06.kwi
	|_test-07.kwi
	|_test-08.kwi
	|_TestParser.scala
	|_TestSyntax.scala
	|_ListParser.scala
	|_ListParsers.scala
	|_MiniML.scala
	|_patterns.scala
	|_sort.scala
	|_sort1.scala
	|_sort2.scala
	|_tcpoly
	|_monads
	|_Monads.scala
	|_xml
	|_phonebook
	|_embeddedBook.scala
	|_phonebook.scala
	|_phonebook1.scala
	|_phonebook2.scala
	|_phonebook3.scala
	|_verboseBook.scala
	|_lib
	|_akka-actors.jar
	|_diffutils.jar
	|_jline.jar
	|_scala-actors-migration.jar
	|_scala-actors.jar
	|_scala-compiler.jar
	|_scala-library.jar
	|_scala-partest.jar
	|_scala-reflect.jar
	|_scala-swing.jar
	|_scalap.jar
	|_typesafe-config.jar
	|_man
	|_man1
	|_fsc.1
	|_scala.1
	|_scalac.1
	|_scaladoc.1
	|_scalap.1
	|_misc
	|_scala-devel
	|_plugins
	|_continuations.jar
	|_src
	|_fjbg-src.jar
	|_msil-src.jar
	|_scala-actors-src.jar
	|_scala-compiler-src.jar
	|_scala-library-src.jar
	|_scala-partest-src.jar
	|_scala-reflect-src.jar
	|_scala-swing-src.jar
	|_scalap-src.jar
	**/

view raw gistfile1.scala hosted with ❤ by GitHub