Dart Concurrency Deep Dive — Isolates, Structured Concurrency, and Async Patterns

Dart's concurrency model is unusual: single-threaded event loop by default, with explicit Isolates for true parallelism. No shared memory, no race conditions, no mutex locks. This guide covers everything from the simple compute() helper to long-lived Isolate workers, structured concurrency patterns, and Stream-based reactive flows. The Mental Model: Isolates vs Threads Concept Dart Isolates JavaScript Workers Java Threads Memory sharing No — message passing only No Yes (with sync overhead) Start