fors.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 99 行

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//############################################################################// for-comprehensions (old and new syntax)//############################################################################// $Id: $//############################################################################object Test extends Application {  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><title>Scala</title></head>      <body>{xs}</body>    </html>;  /////////////////// old syntax ///////////////////  def testOld {    println("\ntestOld")    // lists    for (val x <- xs) print(x + " "); println    for (val x <- xs;         x % 2 == 0) print(x + " "); println    for {val x <- xs         x % 2 == 0} print(x + " "); println    var n = 0    for (val _ <- xs) n += 1; println(n)    for (val (x, y) <- xs zip ys) print(x + " "); println    for (val p @ (x, y) <- xs zip ys) print(p._1 + " "); println    // iterators    for (val x <- it) print(x + " "); println    for (val x <- it;         x % 2 == 0) print(x + " "); println    for {val x <- it         x % 2 == 0} print(x + " "); println    // arrays    for (val x <- ar) print(x + " "); println    for (val x <- ar;         x.toInt > 97) print(x + " "); println    for {val x <- ar         x.toInt > 97} print(x + " "); println    // sequences    for (val x <- xml.child) println(x)    for (val x <- xml.child;         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}

fors.scala - 源码说明

本页面展示了「JAVA 语言的函数式编程扩展」中的 fors.scala 源码文件，采用 SCALA 编程语言编写，共 99 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

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