In fact, python needs only this one way of saying ‘Nothing to see here’.

The Python None is a singleton object of type NoneType. What is the actual difference in meaning for all of these? Java has the keyword ‘ void‘ and the value ‘ null‘, kotlin has Unit, Nothing and null. This restriction has been removed, so you can now create lightweight wrappers that do not allocate memory in most cases.Python has only one way of saying ‘there is nothing here’: None. Implementation by delegation solves this issue, but it did not work with inline classes before 1.7.0. If you want to create a lightweight wrapper for a value or class instance, it's necessary to implement all interface methods by hand. Implementation by delegation to inlined value of inline classĪllow implementation by delegation to an inlined value of an inline class It also stabilizes several language features introduced as previews in previous releases: Kotlin 1.7.0 introduces support for implementation by delegation and a new underscore operator for type arguments. If you face any performance issues with the Kotlin K2 compiler, please report them to our issue tracker. The next Kotlin releases will improve the stability of the K2 compiler and provide more features, so stay tuned! Please note that even issues with State: Open from this list are in fact fixed in K2.

You can also find a short overview of the changes in this video:Īlso, the K2 compiler includes a number of bugfixes. You can now create lightweight wrappers that do not allocate memory in most cases. This release allows implementation by delegation to an inlined value of an inline class. You can use it to automatically infer a type of argument when other types are specified. There's now an underscore operator for type args. We've stabilized opt-in requirement annotations, definitely non-nullable types, and builder inference. Incremental compilation is now also supported for changes made inside dependent non-Kotlin modules and is compatible with Gradle. It is available only for the JVM, and none of the compiler plugins, including kapt, work with it.Ī new approach to the incremental compilation in Gradle. The new Kotlin K2 compiler is in Alpha now, and it offers serious performance improvements.

Here is a list of the major updates in this version: It unveils the Alpha version of the new Kotlin/JVM K2 compiler, stabilizes language features, and brings performance improvements for the JVM, JS, and Native platforms.

Kotlin nullable types