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Fucking Approachable Swift Concurrency

All Contributors

A no-bullshit guide to understanding Swift concurrency. Learn async/await, actors, Sendable, and MainActor with simple mental models.

Visit the site

About

Swift concurrency can be confusing. This site distills the best resources into clear, approachable mental models that anyone can understand.

In the tradition of fuckingblocksyntax.com and fuckingifcaseletsyntax.com.

Topics Covered

  • Async/Await - Suspension vs blocking, and why it matters
  • Tasks - Managing async work with Task and TaskGroup
  • Isolation - The core mental model for Swift concurrency (MainActor, actors, nonisolated)
  • Sendable - What can safely cross isolation boundaries
  • Isolation Inheritance - How isolation flows through your code
  • Common Mistakes - And how to avoid them

Languages

Available in 12 languages: English, Spanish, Portuguese (BR & PT), Arabic, Korean, Japanese, Chinese (Simplified & Traditional), Russian, Turkish and French.

Development

This site is built with Eleventy.

Prerequisites

  • mise (for managing Node.js and pnpm)

Setup

mise install
pnpm install

Development Server

pnpm dev

Then open http://localhost:8080/ in your browser.

Build

pnpm build

Credits

Much of this guide is distilled from Matt Massicotte's excellent work on Swift concurrency.

License

MIT License - see LICENSE.md

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Akshay
Akshay
🖋		 Peter's Path
Peter's Path
🖋		 Sébastien Stormacq
Sébastien Stormacq
🖋		 Ertan
Ertan
📖		 Vikram Kriplaney
Vikram Kriplaney
🖋

This project follows the all-contributors specification. Contributions of any kind welcome!