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Aprendendo a linguagem Scala

Funções Anônimas object TimerAnonymous { def oncePerSecond(callback: () => Unit) { while(true){ callback(); Thread sleep 1000 } } def main(args: Array[String]){ oncePerSecond(() => println("O tempo voa como uma flecha a cada segundo.")) }
Tipagem estática val i = 1 var j : Int = 1
Mixins traço RichIterator estende AbsIterator { def foreach (f: T => Unit) { enquanto (hasNext) f (próximo)} }
Métodos sem Argumento object ComplexNubers{ def main(args: Array[String]){ val c = new Complex(1.2, 3.4) println("imaginary part: " + c.im()) } } class Complex(real: Double, imaginary: Double) { def re = real def im = imaginary }
Contexto de String val name = "James" println(s"Hello, $name") // Hello, James
Exceção class Reader(fname: String) { private val in = new BufferedReader(new FileReader(fname)) @throws[IOException]("if the file doesn't exist") def read() = in.read() }
Parâmetro por nome (x: => Int)
Parâmetro por valor (x: Int)
Filtro for(i <- 1 to 10; if i % 2 == 0), o filtro é “if i % 2 == 0”
Loop for (i <- 0 until 100) println(i) //imprime os números 0 até 99
Função Literal (x: Int, y: Int) => x + y
Array var z:Array[String] = new Array[String](3) ou var z = new Array[String](3)
Definição de Funções def nomeFunção ([lista de parâmetros]) : [tipo de retorno] = { corpo da função return [expr] }
Created by: trabalholp