Swift

How PreferenceKey lets child views communicate information back up the view tree.

Borrowing, consuming, and why Swift's ownership model matters.

A practical mental model for protected state and cross-actor calls in Swift.

When Swift asks for Sendable and how to satisfy it cleanly.

Use traits deliberately so Swift Testing communicates intent instead of just decorating test code.

Running parallel async work in Swift with structured concurrency.

A compact guide to throws, Result, and typed domain errors.

Decode real-world payloads without turning models into a mess.

Use defer to keep cleanup logic honest and close to the scope it protects.

Design builder APIs that read clearly and stay predictable for callers.

Choose formatting APIs that are resilient to locale, context, and product change.

Organize targets and modules so package growth stays manageable.

Attach useful failure context without making calling code noisy.

Keep decoders resilient when APIs and persisted formats evolve over time.

Build async work that stops promptly and predictably when priorities change.

Hide platform differences behind APIs that still feel clean to call.

Use explicit states to make complex flows easier to reason about and test.

Small naming decisions compound into whether an API feels obvious or tiring.