Talking Kotlin

Kotlin 2.3 Release Special (Audio Exclusive)

8 snips
Feb 3, 2026
A fast walkthrough of Kotlin 2.3 highlights. They cover new language checks like unused return value detection and explicit backing fields. Time and UUID APIs land in the standard library. Platform updates include faster Native builds, Swift export fixes, Wasm/JS interop improvements, and Apple target changes.
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INSIGHT

Faster Native Release Builds

  • Kotlin 2.3 JVM emits Java 25 bytecode and Native release link tasks are up to 40% faster.
  • Faster native release builds lower CI time and cost for KMP projects targeting iOS.
INSIGHT

Better Kotlin↔Swift Interop

  • Swift Export now exposes Kotlin enums as Swift enums and supports varargs as variadic Swift parameters.
  • This improves cross-language ergonomics when calling Kotlin from Swift.
ADVICE

Annotate For Better Native Interop

  • Use the C/Objective‑C import beta to integrate native libs and annotate interop types as required.
  • Name function-type parameters to surface helpful parameter names in Xcode suggestions.
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