Kotlin language features and proposals

JetBrains evolves the Kotlin language according to the Kotlin language evolution principles, guided by pragmatic design.

Exploration and design	Kotlin statics and static extensions KEEP proposal: statics.md YouTrack issue: KT-11968
Exploration and design	Collection literals KEEP proposal: Not defined YouTrack issue: KT-43871
Exploration and design	Union types for errors and exceptions KEEP proposal: Not defined YouTrack issue: KT-68296
Exploration and design	Name-based destructuring KEEP proposal: Not defined YouTrack issue: KT-19627
Exploration and design	Support immutability KEEP notes: immutability YouTrack issue: KT-1179
KEEP discussion	KMP Kotlin-to-Java direct actualization KEEP proposal: kmp-kotlin-to-java-direct-actualization.md YouTrack issue: KT-67202
KEEP discussion	Streamline KDoc ambiguity links KEEP proposal: streamline-KDoc-ambiguity-references.md GitHub issues: dokka/#3451, dokka/#3179, dokka/#3334
KEEP discussion	Resolution of links to extensions in KDoc KEEP proposal: links-to-extensions.md GitHub issue: dokka/#3555
KEEP discussion	Uuid KEEP proposal: uuid.md YouTrack issue: KT-31880
KEEP discussion	Improve resolution using expected type KEEP proposal: improved-resolution-expected-type.md YouTrack issue: KT-16768
KEEP discussion	Expose boxed inline value classes in JVM KEEP proposal: jvm-expose-boxed.md YouTrack issue: KT-28135
KEEP discussion	Explicit backing fields: both `public` and `private` type for the same property KEEP proposal: explicit-backing-fields.md YouTrack issue: KT-14663
KEEP discussion	Context parameters: support for context-dependent declarations KEEP proposal: context-parameters.md YouTrack issue: KT-14663
KEEP discussion	Guard conditions in when-with-subject KEEP proposal: guards.md YouTrack issue: KT-13626 Target version: 2.1.0
KEEP discussion	Stabilized `@SubclassOptInRequired` KEEP proposal: subclass-opt-in-required.md YouTrack issue: KT-54617 Target version: 2.1.0
KEEP discussion	Multidollar interpolation: improved handling of `$` in string literals KEEP proposal: dollar-escape.md YouTrack issue: KT-2425 Target version: 2.1.0
KEEP discussion	Non-local `break` and `continue` KEEP proposal: break-continue-in-inline-lambdas.md YouTrack issue: KT-1436 Target version: 2.1.0
KEEP discussion	Java synthetic property references KEEP proposal: references-to-java-synthetic-properties.md YouTrack issue: KT-8575 Target version: 2.1.0
Stable	`Enum.entries`: performant replacement of the `Enum.values()` KEEP proposal: enum-entries.md YouTrack issue: KT-48872 Target version: 2.0.0
Stable	Data objects KEEP proposal: data-objects.md YouTrack issue: KT-4107 Target version: 1.9.0
Stable	RangeUntil operator `..<` KEEP proposal: open-ended-ranges.md YouTrack issue: KT-15613 Target version: 1.7.20
Stable	Definitely non-nullable types KEEP proposal: definitely-non-nullable-types.md YouTrack issue: KT-26245 Target version: 1.7.0
Revoked	Context receivers KEEP proposal: context-receivers.md YouTrack issue: KT-10468

Exploration and design	Kotlin statics and static extensions KEEP proposal: statics.md YouTrack issue: KT-11968
Exploration and design	Collection literals KEEP proposal: Not defined YouTrack issue: KT-43871
Exploration and design	Union types for errors and exceptions KEEP proposal: Not defined YouTrack issue: KT-68296
Exploration and design	Name-based destructuring KEEP proposal: Not defined YouTrack issue: KT-19627
Exploration and design	Support immutability KEEP notes: immutability YouTrack issue: KT-1179

KEEP discussion	KMP Kotlin-to-Java direct actualization KEEP proposal: kmp-kotlin-to-java-direct-actualization.md YouTrack issue: KT-67202
KEEP discussion	Streamline KDoc ambiguity links KEEP proposal: streamline-KDoc-ambiguity-references.md GitHub issues: dokka/#3451, dokka/#3179, dokka/#3334
KEEP discussion	Resolution of links to extensions in KDoc KEEP proposal: links-to-extensions.md GitHub issue: dokka/#3555
KEEP discussion	Uuid KEEP proposal: uuid.md YouTrack issue: KT-31880
KEEP discussion	Improve resolution using expected type KEEP proposal: improved-resolution-expected-type.md YouTrack issue: KT-16768
KEEP discussion	Expose boxed inline value classes in JVM KEEP proposal: jvm-expose-boxed.md YouTrack issue: KT-28135
KEEP discussion	Explicit backing fields: both `public` and `private` type for the same property KEEP proposal: explicit-backing-fields.md YouTrack issue: KT-14663
KEEP discussion	Context parameters: support for context-dependent declarations KEEP proposal: context-parameters.md YouTrack issue: KT-14663
KEEP discussion	Guard conditions in when-with-subject KEEP proposal: guards.md YouTrack issue: KT-13626 Target version: 2.1.0
KEEP discussion	Stabilized `@SubclassOptInRequired` KEEP proposal: subclass-opt-in-required.md YouTrack issue: KT-54617 Target version: 2.1.0
KEEP discussion	Multidollar interpolation: improved handling of `$` in string literals KEEP proposal: dollar-escape.md YouTrack issue: KT-2425 Target version: 2.1.0
KEEP discussion	Non-local `break` and `continue` KEEP proposal: break-continue-in-inline-lambdas.md YouTrack issue: KT-1436 Target version: 2.1.0
KEEP discussion	Java synthetic property references KEEP proposal: references-to-java-synthetic-properties.md YouTrack issue: KT-8575 Target version: 2.1.0

Stable	`Enum.entries`: performant replacement of the `Enum.values()` KEEP proposal: enum-entries.md YouTrack issue: KT-48872 Target version: 2.0.0
Stable	Data objects KEEP proposal: data-objects.md YouTrack issue: KT-4107 Target version: 1.9.0
Stable	RangeUntil operator `..<` KEEP proposal: open-ended-ranges.md YouTrack issue: KT-15613 Target version: 1.7.20
Stable	Definitely non-nullable types KEEP proposal: definitely-non-nullable-types.md YouTrack issue: KT-26245 Target version: 1.7.0

Revoked	Context receivers KEEP proposal: context-receivers.md YouTrack issue: KT-10468

Revoked

Context receivers

KEEP proposal: context-receivers.md
YouTrack issue: KT-10468

Last modified: 04 November 2024