At KotlinConf 2025, JetBrains unveiled major advancements in Kotlin, notably the K2 compiler becoming the default in IntelliJ IDEA 2025.1, which boosts productivity with reduced compilation times. Key features featured in Kotlin 2.2 include guard conditions, multi-dollar string interpolation, and non-local breaks. The K2 compiler's adoption, proven to decrease compilation times by over 40% on large projects, signals a major enhancement in developer experience, establishing a framework for high-quality language feature rollouts in the future.
When we turned on K2 mode for the repo, compilation time dropped by over 40%. That's a serious saving, especially when you consider this was tested on their colossal IntelliJ monorepo.
Kothlin 2.2 is set to bring some rather useful features to the table. Developers can start getting ready for guard conditions in when-with-subject, multi-dollar string interpolation for more elegant templating.
The K2 compiler now being the default in IntelliJ IDEA 2025.1 isn't just a minor tweak, it's a fundamental shift. This offers a serious productivity boost.
JetBrains emphasizes a steady, high-quality rollout of new language features, focusing on making Kotlin even nicer to use.
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