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Scala example source code file (fors.scala)

This example Scala source code file (fors.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

app, app, list, list, test, test

The Scala fors.scala source code

//############################################################################
// for-comprehensions (old and new syntax)
//############################################################################

//############################################################################

object Test extends App {
  val xs = List(1, 2, 3)
  val ys = List('a, 'b, 'c)

  def it = 0 until 10

  val ar = "abc".toCharArray

  val xml =
    <html>
      <head>Scala
      <body>{xs}
    </html>;

  /////////////////// old syntax ///////////////////

  def testOld {
    println("\ntestOld")

    // lists
    for (x <- xs) print(x + " "); println
    for (x <- xs;
         if x % 2 == 0) print(x + " "); println
    for {x <- xs
         if x % 2 == 0} print(x + " "); println
    var n = 0
    for (_ <- xs) n += 1; println(n)
    for ((x, y) <- xs zip ys) print(x + " "); println
    for (p @ (x, y) <- xs zip ys) print(p._1 + " "); println

    // iterators
    for (x <- it) print(x + " "); println
    for (x <- it;
         if x % 2 == 0) print(x + " "); println
    for {x <- it
         if x % 2 == 0} print(x + " "); println

    // arrays
    for (x <- ar) print(x + " "); println
    for (x <- ar;
         if x.toInt > 97) print(x + " "); println
    for {x <- ar
         if x.toInt > 97} print(x + " "); println

    // sequences
    for (x <- xml.child) println(x)
    for (x <- xml.child;
         if x.label == "head") println(x)
  }

  /////////////////// new syntax ///////////////////

  def testNew {
    println("\ntestNew")

    // lists
    var n = 0
    for (_ <- xs) n += 1; println(n)
    for ((x, y) <- xs zip ys) print(x + " "); println
    for (p @ (x, y) <- xs zip ys) print(p._1 + " "); println

    // iterators
    for (x <- it) print(x + " "); println
    for (x <- it if x % 2 == 0) print(x + " "); println
    for (x <- it; if x % 2 == 0) print(x + " "); println
    for (x <- it;
         if x % 2 == 0) print(x + " "); println
    for (x <- it
         if x % 2 == 0) print(x + " "); println
    for {x <- it
         if x % 2 == 0} print(x + " "); println
    for (x <- it;
         val y = 2
         if x % y == 0) print(x + " "); println
    for {x <- it
         val y = 2
         if x % y == 0} print(x + " "); println

    // arrays
    for (x <- ar) print(x + " "); println

    // sequences
    for (x <- xml.child) println(x)
    for (x <- xml.child if x.label == "head") println(x)
  }

  ////////////////////////////////////////////////////

  testOld
  testNew
}

Other Scala examples (source code examples)

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