Aprendendo a linguagem Scala
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 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.")) }
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| Tipagem estática | val i = 1
var j : Int = 1
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| Mixins | traço RichIterator estende AbsIterator {
def foreach (f: T => Unit) { enquanto (hasNext) f (próximo)}
}
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| 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
}
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| Contexto de String | val name = "James"
println(s"Hello, $name") // Hello, James
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| 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()
}
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| Parâmetro por nome | (x: => Int)
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| Parâmetro por valor | (x: Int)
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| Filtro | for(i <- 1 to 10; if i % 2 == 0), o filtro é “if i % 2 == 0”
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| Loop | for (i <- 0 until 100) println(i) //imprime os números 0 até 99
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| Função Literal | (x: Int, y: Int) => x + y
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| Array | var z:Array[String] = new Array[String](3)
ou
var z = new Array[String](3)
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| Definição de Funções | def nomeFunção ([lista de parâmetros]) : [tipo de retorno] = {
corpo da função
return [expr]
}
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Created by:
trabalholp
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