Kotlin (programming language)

Kotlin

Paradigm	Multi-paradigm: object-oriented, functional, imperative, block structured, declarative, generic, reflective, concurrent
Designed by	JetBrains
Developer	JetBrains
First appeared	July 22, 2011; 10 years ago
Stable release	1.6.10[1]  / 14 December 2021; 47 days ago
Preview release	build-1.6.20-dev-107 / August 26, 2021; 5 months ago
Typing discipline	Inferred, static, strong
Platform	Android JVM iOS macOS (incl. Apple silicon support) watchOS tvOS Windows Linux JavaScript (Kotlin/JS) WebAssembly LLVM (Kotlin/Native)
OS	Cross-platform
License	Apache License 2.0
Filename extensions	.kt, .kts, .ktm
Website	kotlinlang.org
Influenced by
C# Eiffel Gosu Groovy Java JavaScript ML Python Scala

Kotlin (/ˈkɒtlɪn/)^[2] is a cross-platform, statically typed, general-purpose programming language with type inference. Kotlin is designed to interoperate fully with Java, and the JVM version of Kotlin’s standard library depends on the Java Class Library,^[3] but type inference allows its syntax to be more concise. Kotlin mainly targets the JVM, but also compiles to JavaScript (e.g., for frontend web applications using React^[4]) or native code via LLVM (e.g., for native iOS apps sharing business logic with Android apps).^[5] Language development costs are borne by JetBrains, while the Kotlin Foundation protects the Kotlin trademark.^[6]

On 7 May 2019, Google announced that the Kotlin programming language is now its preferred language for Android app developers.^[7] Since the release of Android Studio 3.0 in October 2017, Kotlin has been included as an alternative to the standard Java compiler. The Android Kotlin compiler produces Java 8 bytecode by default (which runs in any later JVM), but lets the programmer choose to target Java 9 up to 17, for optimization,^[8] or allows for more features; has bidirectional record class interoperability support for JVM, introduced in Java 16, considered stable as of Kotlin 1.5.

Kotlin support for compilation directly to JavaScript (i.e., the classic back-end) is considered stable since version 1.3, while the new Kotlin/JS(IR) is in beta as of version 1.5.30. The new optimized implementations of Kotlin/JVM(IR) and Kotlin/JS (IR-based) were introduced in version 1.4. Kotlin/JVM(IR) is considered stable and enabled by default since version 1.5. Kotlin/Native (for e.g. Apple silicon support) is considered beta since version 1.3.^[9][10]

References:
https://kotlinlang.org/
https://en.wikipedia.org/wiki/Kotlin_(programming_language)