Swift Concurrency Patterns

Expert guidance on Swift Concurrency best practices covering async/await, actors, tasks, Sendable, threading, memory management, testing, and migration strategies.

Rules

Core Swift Concurrency rules extracted as discrete, high-impact patterns. See rules index for the full list organized by:

• Async/Await Patterns - Never add dummy suspension points to silence warnings
• Actor Isolation - Use actors for data-race safety with compiler verification
• Task Lifecycle - Understand task cancellation and structured concurrency
• Sendable Conformance - Require Sendable for crossing concurrency boundaries
• Testing - Patterns for testing async concurrent code without flaky tests

References

See references/swift-concurrency.md for comprehensive guidance organized by:

• Async/Await Fundamentals - Core patterns, error handling, parallel execution