Understanding Sendable in Swift: Mastering Concurrency Safety
With the introduction of Structured Concurrency and Actors, Apple fundamentally changed how we write asynchronous Swift code. However, simply using async/await or Task does not automatically make your code safe from data races. To achieve true thread safety—and to compile under Swift 6’s Strict Concurrency checks—you must understand concurrency domains and the Sendable protocol. In this post, we will explore what Sendable is, when and how to use it, and the dangerous anti-patterns you must avoid when trying to quiet the compiler. ...