Async JavaScript, Untangled

JavaScript promises async await event loop concurrency non-blocking code real-world examples

Master the hardest parts of JavaScript: promises, async/await, and the event loop. In Async JavaScript, Untangled, Victor Fontaine cuts through the confusion with worked examples that show exactly how to write non-blocking code that handles real concurrency cleanly. You'll start with the event loop's mechanics, then progress through promise chaining, error handling, and async/await patterns—each concept illustrated with practical, runnable code. By the end, you'll untangle race conditions, avoid callback hell, and build responsive web apps that scale. This is a hands-on, beginner-to-pro guide for every JavaScript developer who wants to write clean, concurrent code without the headaches. Compare with [placeholder] and [placeholder] for a deeper dive.

What You'll Learn

• How the event loop processes microtasks and macrotasks
• Building promises from scratch to understand their behavior
• Async/await patterns for sequential and parallel execution
• Handling real concurrency with race, all, and allSettled
• Error propagation and try/catch in async flows
• Non-blocking I/O and avoiding deadlocks

With clear explanations and dozens of worked examples, this book transforms confusion into confidence. Perfect for frontend, backend, and full-stack developers ready to tame asynchronous JavaScript.