#JetBrains

Kotlin 2.1.0 was released on November 27, 2024, the first feature release after the stable K2 compiler. It previewed guard conditions in when, non-local break and continue, multi-dollar string interpolation, and added K2 compiler improvements. Here is what changed.

Kotlin 2.0.0 was released on May 21, 2024, a huge milestone that made the rewritten K2 compiler stable and the default for JVM, Native, Wasm and JS. It compiles twice as fast and improves smart casts. Here is what changed.

Kotlin 1.9.0 was released on July 6, 2023, bringing the K2 compiler for the JVM to Beta. It stabilised the enum entries property, the open-ended range operator, data objects, and previewed a custom Kotlin/Native memory allocator. Here is what changed.