abreslav

package sample.hello

import akka.actor.ActorSystem
import akka.actor.Props
import akka.actor.UntypedActor
import akka.actor.UntypedActorContext
import akka.actor.ActorPath
import scala.concurrent.duration.Duration
import java.util.HashMap
import akka.actor.ActorSystem

abreslav

fun Int.divides(d: Int) = this % d == 0 

fun fizzbuzz(n: Int) = when {
    n divides 15 -> "fizzbuzz"
    n divides 3  -> "fizz"
    n divides 5  -> "buzz"
    else         -> "$n"
}

fun result(max: Int) = (0..max) map { n -> fizzbuzz(n) }

abreslav

/*

    Play with this code at 

        [http://goo.gl/yPtkb](Kotlin Web Demo)

*/

abreslav

/*
 *  A question about Java (not Kotlin!), first asked by Alexander Udalov (@udalov).
 *
 *  How many calls to getClass() does the code below make?
 *  Curiously enough, the answer is ONE (see the byte codes below).
 *
 *  Now the questions is: why does javac emit the call to getClass()?
 */

class C {

abreslav

procedure permutations(var a: array[1..N] of Integer; pos: Integer);
begin
  if pos >= N then begin
    for i := 1 to N do
      Write(a[i], ' ');
    WriteLn;
  end;
  
  for i := 1 to N do begin
    a[i] := i;

abreslav

// Sometimes you are inside a lambda and want to return a value from some surrounding function (or surrounding lambda)

fun foo(): Any? {
    return withNLR(default = 25) {
        listOf(1, 2, 3).forEach {
            if (it > 2) doReturn(it)
        }
    }
}

abreslav

The Kotlin Programming Language

Kotlin is a modern statically typed programming language targeting the Java and JavaScript platforms. It is conceived as a "modern language for industry", keeping a balance between flexibility and readability, expressiveness and safety.

Project Overview

A modern programming language is much more than a grammar. Principal susystems of Kotlin include

• Compiler front-end
• Lexer/Parser translates text into a syntax tree, reports syntax errors

abreslav

package ru.ifmo.rain.adsl;

import java.io.FileOutputStream

fun main(args: Array<String>) {
    val generator = Generator(FileOutputStream("out.kt"), args[0], args[1])
    generator.run()
}

abreslav

class Bar {
    fun invoke(x: Int): Int = x
}
class Foo {
    val get: Bar = Bar()
}



fun foo () {

abreslav

Ref should exist for this node. Hash: 603812
java.lang.Throwable
	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:113)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.createBranch(GraphBuilder.java:123)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.addCurrentCommitAndFinishRow(GraphBuilder.java:107)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.append(GraphBuilder.java:165)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.runBuild(GraphBuilder.java:198)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.build(GraphBuilder.java:29)
	at com.intellij.vcs.log.data.DataPack.build(DataPack.java:43)
	at com.intellij.vcs.log.data.VcsLogDataHolder.smartRefresh(VcsLogDataHolder.java:404)