Kotlin 1.7.0, an update to the JVM, web, and mobile programming language from JetBrains, includes an alpha version of the ground-breaking K2 compiler.
K2 is designed to accelerate the creation of new language features, unify the platforms that Kotlin supports, and offer an API for compiler modifications in addition to enhancing performance. However, the alpha version is restricted to JVM projects. And only the kept plugin for annotation processors currently works with it.
Kotlin 1.7.0, an update to the JVM, web, and mobile programming language from JetBrains, includes an alpha version of the ground-breaking K2 compiler.
K2 is designed to accelerate the creation of new language features, unify the platforms that Kotlin supports, and offer an API for compiler modifications in addition to enhancing performance. However, the alpha version is restricted to JVM projects. And only the kept plugin for annotation processors currently works with it.
- Definitely non-nullable types have been promoted to stable. These provide better interoperability when extending generic Java classes and interfaces.
- Builder inference, a type inference that is useful when calling generic builder functions, is automatically activated if a regular type inference cannot get enough information about a type without specifying the
-Xenable-builder-inferencecompiler option introduced in Kotlin 1.6.0 last November. - Opt-in requirements are now stable and do not require additional compiler configuration.
- An underscore operator for type args can be used to automatically infer a type of argument when other types are specified.
- Implementation by delegation to an inlined value of an inline class is enabled. Developers now can create lightweight wrappers that do not allocate memory in most cases.
A beta release of Kotlin 1.7.0 was published in May. Kotlin 1.6.20 arrived in April.
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