Tag: concurrency

Async Let Bindings: a Gotcha and a Closer Look

Swift 5.5 introduced a powerful set of concurrency tools to deal with asynchronous tasks, eliminating the complexity of callbacks and queues. Besides Task and TaskGroup for managing child tasks, the async let syntax allows you to start concurrent tasks and bind their results to variables, following structured concurrency principles. Yet, be cautious when writing async let bindings. Consider these two declarations below. async let x = taskX() // returns an Int async let y = taskY() // retunns a String let result = await (x, y) async let (x, y) = (taskX(), taskY()) let result = await (x, y) At first glance, they seem equivalent.