Early access program for Kotlin 1.2 has been started

The start of the early access program for Kotlin 1.2 has been announced and its first milestone release 1.2-M1 is now out
30 June 2017   755

Kotlin is a statically-typed programming language that runs on the Java Virtual Machine and also can be compiled to JavaScript source code

Statically typed programming language for modern multiplatform applications opens access for Kotlin 1.2. The list of changes is not so big though contains several features:

  • Language

The single notable language feature proposed in this milestone is array literals, whose usages are constrained to annotation arguments.

  • Standard library

The release features two KEEPs (Kotlin Evolution and Enhancement Proposals) regarding the standard library API. The first is KEEP-49 introducing additional operations and conversion extensions for BigIntegerand and BigDecimal types. The second one is KEEP-11 which covers a number of functions related to partitioning collections and sequences.

  • JavaScript

JavaScript is a lightweight interpreted or JIT-compiled programming language with first-class functions

Earlier in 1.1.2 release the opt-in JS typed arrays support has been introduced. When enabled it translates Kotlin primitive arrays, such as IntArray, DoubleArray etc, into JavaScript typed arrays. Now the opt-in is no longer required as this support is enabled by default.

Check out Kotlin’s changelog to see the full list of changes.

JetBrains to Roll Out Kotlin/Native 0.8

Version 0.8 of Kotlin/Native brings new features and bug fixes
13 July 2018   141

The project team of Kotlin / Native introduced the release of version 0.8. Corrections and additions have concerned the security of multithreaded programming, the expansion of library functionality and support for iOS devices. As always, alot of bugs are fixed.


Implemented the concept of object freezing

object Config {
  var width: Int = 10
  private set
  init {
    val file = fopen("config.txt", "r")
    if (file != null) {
              try {
              val buffer = ByteArray(2 * 1024)
                 while (true) {
                 val nextLine = fgets(buffer.refTo(0), buffer.size, file)?.toKString()
                 if (nextLine == null || nextLine.isEmpty()) break
                 val records = nextLine.split('=')
                 if (records.size != 2) continue
                 val key = records[0].trim()
                 val value = records[1].trim()
                 when (key) {
                         "width" -> width = value.toInt()
             } finally {

This code considers the configuration file and will later receive the Config.width property. 

The Config file itself is divided for any number of threads or vorkers. After publication, the object is frozen and any attempt to change it will result in an exception (InvalidMutabilityException).

The second peculiarity of parallelism in the Kotlin / Native project is indivisible values and references. Let's add an image:

object Config {
private val icon_ = AtomicReference()
val icon: Image
get() = icon_.get()!!
fun updateIcon(file: String) {
val imageData = Image(file)
icon_.compareAndSwap(icon_.get(), imageData.freeze())

All information about the icon in the AtomicReference is frozen. Any changes are indivisible and similar information is visible to each client.

Kotlin Libraries

Starting v 0.8, the standard library (kotlin. *) is compatible with other platforms. Standard number generator and the function of mixing the collections are designed to eliminate the use of sharpened for a specific platform API. As an experiment, the project supports other libraries, for example, kotlinx.coroutines, kotlinx.serialization, and also the Ktor HTTP client.

Changes for iOS devices

Fixed issues with the publication in the App Store and the initialization of the platform. Support for the 32-bit ARM architecture of iOS processors, which allows using Kotlin / Native on older devices from Apple added.