Kotlin 1.3 Docs

Kotlin is a statically-typed programming language that runs on the Java virtual machine and also can be compiled to JavaScript source code or use the LLVM compiler infrastructure. Its primary development is from a team of JetBrains programmers based in Saint Petersburg, Russia. While the syntax is not compatible with Java, Kotlin is designed to interoperate with Java code and is reliant on Java code from the existing Java Class Library, such as the collections framework. Kotlin uses aggressive type inference to determine the type of values and expressions for which type has been left unstated. This reduces language verbosity relative to Java, which demands often entirely redundant type specifications.

As of Android Studio 3.0 Kotlin is a fully supported programming language on Android and lets the user choose between targeting Java 6- or Java 8-compatible bytecode.

Table of Content

Kotlin for Server Side

Kotlin for Android

Kotlin for JavaScript

Kotlin for Native

Coroutines

Multiplatform

What's New in 1.1

What's New in 1.2

What's New in 1.3

Basic Syntax

Idioms

Coding Conventions

Basic Types

Packages and Imports

Control Flow

Returns and Jumps

Classes and Inheritance

Properties and Fields

Interfaces

Visibility Modifiers

Extensions

Data Classes

Sealed Classes

Generics

Nested Classes

Enum Classes

Objects

Inline Classes

Delegation

Delegated Properties

Functions

Lambdas

Inline Functions

Platform-Specific Declarations

Building with Gradle

Destructuring Declarations

Collections

Ranges

Type Checks and Casts

This expressions

Equality

Operator overloading

Null Safety

Exceptions

Annotations

Reflection

Type-Safe Builders

Type Aliases

Standard Library

kotlin.test

Keywords and Operators

Grammar

Calling Java from Kotlin

Calling Kotlin from Java

Dynamic Type

Calling JavaScript from Kotlin

Calling Kotlin from JavaScript

JavaScript Modules

JavaScript Reflection

JavaScript DCE

Concurrency

Immutability

Kotlin Libraries

Platform Libraries

C Interop

Objective-C and Swift Interop

Gradle Plugin

Debugging

FAQ

Coroutines Guide

Basics

Cancellation and Timeouts

Channels

Composing Suspending Functions

Coroutine Context and Dispatchers

Exception Handling

Select Expression

Shared Mutable State and Concurrency

Documenting Kotlin Code

Using Kapt

Using Gradle

Using Maven

Using Ant

Kotlin and OSGi

Compiler plugins

Coding Conventions

Kotlin Evolution

Stability of different components

Compatibility Guide for Kotlin 1.3

FAQ

Comparison to Java

Getting Started with IntelliJ IDEA

Getting Started with Eclipse

Working with the Command Line Compiler

Working with Build Tools

Koans

Getting Started With Android Development

Kotlin Android Extensions

Android Frameworks

Mixing Java and Kotlin in one project

Kotlin to JavaScript

Getting Started with Gradle

Getting Started with IntelliJ IDEA

Getting Started with Maven

Creating a Kotlin JavaScript library with the Command Line Compiler

Working with Kotlin and JavaScript Modules

Working with JavaScript

Debugging Kotlin in browser

iOS and Android

Multiplatform Library

Basic Kotlin/Native Application

Interop with C Libraries

Mapping Primitive Data Types from C

Mapping Struct and Union Types from C

Mapping Function Pointers from C

Mapping Strings from C

Working with Kotlin/Native Libraries

Targeting Multiple Platforms

Kotlin/Native as a Dynamic Library

Kotlin/Native as an Apple Framework

Gradle for Kotlin/Native

Multiplatform Project: iOS and Android

Asynchronous Programming

Introduction to Kotlin Coroutines on the JVM

Creating Web Applications with Http Servlets

Creating a RESTful Web Service with Spring Boot

Setting up Kotlin on TeamCity

Learning Kotlin with EduTools plugin

Teaching Kotlin with EduTools plugin

Books

More Resources