Kotlin 1.3.70

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Overview

Kotlin for Server Side

Kotlin for Android

Kotlin for JavaScript

Kotlin for Native

Kotlin for Data Science

What's New

What's New in 1.3

What's New in 1.2

What's New in 1.1

Getting Started

Coding Conventions

Basics

Packages and Imports

Returns and Jumps

Classes and Objects

Classes and Inheritance

Properties and Fields

Visibility Modifiers

Delegated Properties

Functions and Lambdas

Inline Functions

Collections

Collections Overview

Constructing Collections

Ranges and Progressions

Operations Overview

Transformations

Plus and Minus Operators

Retrieving Collection Parts

Retrieving Single Elements

Aggregate Operations

Collection Write Operations

List Specific Operations

Set Specific Operations

Map Specific Operations

Coroutines

Coroutines Guide

Cancellation and Timeouts

Composing Suspending Functions

Coroutine Context and Dispatchers

Asynchronous Flow

Exception Handling and Supervision

Shared Mutable State and Concurrency

Select Expression (experimental)

Multiplatform Programming

Platform-Specific Declarations

Building with Gradle

More Language Constructs

Destructuring Declarations

Type Checks and Casts

This expressions

Operator overloading

Scope Functions

Type-Safe Builders

Opt-in Requirements

Core Libraries

Standard Library

Reference

Keywords and Operators

Java Interop

Calling Java from Kotlin

Calling Kotlin from Java

JavaScript

Setting Up a Project

Calling JavaScript from Kotlin

Calling Kotlin from JavaScript

JavaScript Modules

JavaScript Reflection

Native

Kotlin Libraries

Platform Libraries

Objective-C and Swift Interop

Symbolicating iOS crash reports

CocoaPods Integration

Tools

Documenting Kotlin Code

Kotlin Compiler Options

Kotlin and OSGi

Compiler plugins

Coding Conventions

Evolution

Kotlin Evolution

Stability of different components

Compatibility Guide for Kotlin 1.3

FAQ

Comparison to Java

kotlin-stdlib / kotlin / Boolean / toString

toString

Native

1.3

fun toString(): String

Returns a string representation of the object.

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Contributing to Kotlin

Licensed under the Apache 2 license

Kotlin Trademark is protected under the Kotlin Foundation

Sponsored and developed by JetBrains

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