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package test
import annotation.{tailrec, switch}
import collection.mutable._
object typers {
val names = List("a", "b", "c")
val ints = List(1, 2, 3)
object Inference {
for ((name, n) <- (names, ints).zipped)
println(name.length + n)
def double(x: Char): String = s"$x$x"
"abc" flatMap double
}
object Eta {
def fun(x: Int): Int = x + 1
val foo = fun(_)
}
case class DefaultParams(init: String => String = identity)
object DefaultParams {
def foo(x: String => String = identity) = x("abc")
foo()
}
class List[+T] {
def :: [U >: T](x: U): List[U] = new :: (x, this)
def len: Int = this match {
case x :: xs1 => 1 + xs1.len
case Nil => 0
}
}
object Nil extends List[Nothing]
case class :: [+T] (hd: T, tl: List[T]) extends List[T]
def len[U](xs: List[U]): Int = xs match {
case x :: xs1 => 1 + len(xs1)
case Nil => 0
}
object returns {
def foo(x: Int): Int = {
return 3
}
}
object tries {
val x = try {
"abc"
} catch {
case ex: java.io.IOException =>
123
} finally {
println("done")
}
val y = try 2 catch Predef.identity
val z = try 3 finally "abc"
println("abc".toString)
}
class C {
@tailrec final def factorial(acc: Int, n: Int): Int = (n: @switch) match {
case 0 => acc
case _ => factorial(acc * n, n - 1)
}
println(factorial(1, 10))
}
class Refinements {
trait C { type T; def process(x: T): Int }
val y: C { type T; val key: T; def process(x: T): Int } = ???
}
object Accessibility {
class A {
val x: String = "abc"
}
class B extends A {
private def x: Int = 1
}
val b: B = new B
val y = b.x
val z: String = y
}
object Self {
class A(self1: Int) { self =>
def self1(x: Int) = x
class B {
val b = self
val c: A = b
}
val a = self
val c: A = a
}
}
object Arrays {
val arr = List("a", "b", "c").toArray
val i = 2
arr(i).charAt(0)
val x = new ArrayBuffer[String] // testing overloaded polymorphic constructors
val entries = Array("abc", "def")
for ((x, i) <- entries.zipWithIndex)
println(x)
}
object SeqExtractors {
val y = names match {
case List(x, z) => x
case List(x) => x
case List() => ""
}
val yy: String = y
}
}
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