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Languages & runtimes · #dart
Learn how to enable Dart’s sound null safety, run the migration tool, handle dependency updates, and verify that null‑reference bugs are caught at compile time.
Guide to picking the right way to declare a non‑null field in Dart sound null safety: compare late final, nullable getters, and required constructor parameters.
Use Flutter’s Rect class to build precise, high‑performance hit‑testing logic in custom widgets. Learn how to override RenderBox.hitTest, cache Rects, and validate the approach with a draggable square example.
When developing Dart applications that persist user data or application state, developers often need to create reliable backup and restore mechanisms. Ensuring that a backup can be successfully restored without corruption or data loss is a critical validation step, especially when targeting multiple platforms such as mobile, desktop, and web. Constraints inc
Goal Verify whether the Dart VM executes an isolate’s finalizers when the isolate terminates because of an uncaught asynchronous error, and determine which native memory or thread resources may remain allocated. Constraint In Dart SDK 2.19 and later, Isolate.kill() triggers a graceful shutdown that runs finalizers and releases native memory. However, the VM’
Goal: achieve reproducible builds when using path dependencies in Dart projects. Constraint: pubspec.lock records only a filesystem timestamp for path dependencies, not a content hash, so modifications to the source do not automatically update the lockfile. Uncertainty: the Dart SDK provides no built‑in flag or analysis option to treat path dependencies as i
Dart handles strings as immutable objects, which presents a specific challenge when implementing least-privilege authentication flows. When sensitive data like OAuth2 tokens or JWTs are retrieved from secure storage and processed, the objects remain in the heap until the garbage collector decides to reclaim the memory. Because the language does not provide a
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