A Practical Guide to Swift Concurrency: Understanding Async/Await, Actors, and MainActor

Most of what apps do is wait. Fetch data from a server - wait for the response. Read a file from disk - wait for the bytes. Query a database - wait for the results.

Before Swift's concurrency system, you'd express this waiting with callbacks, delegates, or Combine. They work, but nested callbacks get hard to follow, and Combine has a steep learning curve.

async/await gives Swift a new way to handle waiting. Instead of callbacks, you write code that looks sequential - it pauses, waits, and resumes. Under the hood, Swift's runtime manages these pauses efficiently.

A no-bullshit guide to Swift concurrency. Learn async/await, actors, Sendable, and MainActor with simple mental models. No jargon, just clear explanations.