Yuichiroh

import java.io.PrintWriter

import scala.io.Source

implicit class Using[T <: AutoCloseable](resource: T) {
  def foreach[R](op: T => R): R = {
    try op(resource)
    catch { case e: Exception => throw e }
    finally resource.close()
  }

Yuichiroh

import java.io.PrintWriter

import scala.io.Source
import scala.util.continuations._

trait ContextType[B]

def contextType[B]: ContextType[B] = null

def using[A <: AutoCloseable, B: ContextType](resource: A)(op: A => B) = {

Yuichiroh

val n = reset {
  println("A")
  val num = shift { (cont: Int => Int) =>
    println("B")
    cont(cont(1))
  }
  println("num", num)
  num * 2
}
println("n", n)

Yuichiroh

val plus012 = Array((_: Int) + 0,
                    (_: Int) + 1,
                    (_: Int) + 2)

/* plus012.apply(1) で (_: Int) + 1 を取り出して、2 を渡す */
plus012(1)(2) // 3

/* SeqがPartialFunction[Int, A]を継承しているので orElseを呼べる
 * plus: PartialFunction[Int, (Int) => Int] */
val plus = plus012.orElse[Int, Int => Int] { case i => (_: Int) + i }

Yuichiroh

implicit class ArgmaxColl[A, CC[X] <: Seq[X]](val coll: CC[A]) extends AnyVal {
  def argmax(implicit o:Ordering[A]): Int = coll.indices.maxBy(coll)
}

val as = scala.util.Random.shuffle(1 to 10)

as.argmax

Yuichiroh

-- mouse highlighting
_c = require("hs.canvas")

function createCanvas(screen)
  local cp = hs.mouse.getAbsolutePosition()
  local f = screen:frame()
  canvas = _c.new(f):show()
  canvas[1] = {
    action = "build",
    type = "circle",