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Module stdlib

Kotlin Standard Library

The Kotlin Standard Library provides living essentials for everyday work with Kotlin. These include:

  • Higher-order functions implementing idiomatic patterns ([let][kotlin.let], [apply][kotlin.apply], [use][kotlin.io.use], [synchronized][kotlin.synchronized], etc).
  • Extension functions providing querying operations for collections (eager) and sequences (lazy).
  • Various utilities for working with strings and char sequences.
  • Extensions for JDK classes making it convenient to work with files, IO, and threading.

Package kotlin

Core functions and types, available on all supported platforms.

Package kotlin.annotation

Library support for the Kotlin annotation facility.

Package kotlin.browser

Access to top-level properties (document, window etc.) in the browser environment.

Package kotlin.collections

Collection types, such as [Iterable][kotlin.collections.Iterable], [Collection][kotlin.collections.Collection], [List][kotlin.collections.List], [Set][kotlin.collections.Set], [Map][kotlin.collections.Map] and related top-level and extension functions.

Package kotlin.comparisons

Helper functions for creating [Comparator][java.util.Comparator] instances.

Package kotlin.concurrent

Utility functions for concurrent programming.

Package kotlin.coroutines.experimental

Library support for coroutines, including support for lazy sequences.

Package kotlin.coroutines.experimental.intrinsics

Low-level building blocks for libraries that provide coroutine-based APIs.

Package kotlin.dom

Utility functions for working with the browser DOM.

Package kotlin.experimental

Experimental APIs, subject to change in future versions of Kotlin.

Package kotlin.io

IO API for working with files and streams.

Package kotlin.js

Functions and other APIs specific to the JavaScript platform.

Package kotlin.jvm

Functions and annotations specific to the Java platform.

Package kotlin.properties

Standard implementations of delegates for delegated properties and helper functions for implementing custom delegates.

Package kotlin.ranges

Ranges, Progressions and related top-level and extension functions.

Package kotlin.reflect

Runtime API for Kotlin reflection

Package kotlin.reflect.full

Extensions for Kotlin reflection provided by kotlin-reflect library.

Package kotlin.reflect.jvm

Runtime API for interoperability between Kotlin reflection and Java reflection provided by kotlin-reflect library.

Package kotlin.sequences

[Sequence][kotlin.sequences.Sequence] type that represents lazily evaluated collections. Top-level functions for instantiating sequences and extension functions for sequences.

Package kotlin.streams

Utility functions for working with Java 8 streams.

Package kotlin.system

System-related utility functions.

Package kotlin.test

Functions for writing test assertions.

Package kotlin.text

Functions for working with text and regular expressions.

Package org.khronos.webgl

Kotlin JavaScript wrappers for the WebGL API.

Package org.w3c.dom

Kotlin JavaScript wrappers for the DOM API.

Package org.w3c.dom.css

Kotlin JavaScript wrappers for the DOM CSS API.

Package org.w3c.dom.events

Kotlin JavaScript wrappers for the DOM events API.

Package org.w3c.dom.parsing

Kotlin JavaScript wrappers for the DOM parsing API.

Package org.w3c.dom.svg

Kotlin JavaScript wrappers for the DOM SVG API.

Package org.w3c.dom.url

Kotlin JavaScript wrappers for the DOM URL API.

Package org.w3c.fetch

Kotlin JavaScript wrappers for the W3C fetch API.

Package org.w3c.files

Kotlin JavaScript wrappers for the W3C file API.

Package org.w3c.notifications

Kotlin JavaScript wrappers for the Web Notifications API.

Package org.w3c.performance

Kotlin JavaScript wrappers for the Navigation Timing API.

Package org.w3c.workers

Kotlin JavaScript wrappers for the Web Workers API.

Package org.w3c.xhr

Kotlin JavaScript wrappers for the XMLHttpRequest API.