The Dart Editor together with the Dartium web browser allow us to use breakpoints in order to debug step by step. We can execute our code in the dartium web browser and track it step by step using breakpoints in the Dart Editor.

Stable Values in Java (JEP 502): Deferred Immutability with JVM Trust
Explore Stable Values – a new Java 25 upcoming feature (JEP 502) enabling lazy initialization with immutable performance and JVM-level optimizations.