Async JavaScript, Untangled

Write Async Code That Reads Like Sync

Victor Fontaine

• Publisher: Chiify
• Year: 2026
• Topic: Computer Science
• eBook ISBN:
  9798259604575
• Subtopic: Parallel Programming
• Index: Computer Science

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.

Table of contents

• Async JavaScript, Untangled
• Async JavaScript, Untangled
• Preface
• Chapter 1 — The Synchronous Trap
• Chapter 2 — The Event Loop Engine
• Chapter 3 — Callbacks: The Original Pattern
• Chapter 4 — Promises: A Better Contract
• Chapter 5 — Fetch API and Promise Composition
• Chapter 6 — Async/Await: Writing Async Code That Reads Like Sync
• Chapter 7 — Generators: Pause and Resume
• Chapter 8 — Async Generators: Streaming Data
• Chapter 9 — Error Handling Strategies
• Chapter 10 — Testing Async Code
• Chapter 11 — Concurrency and Race Conditions
• Chapter 12 — Performance Optimization
• Chapter 13 — Security and Memory
• Chapter 14 — Real-Time with WebSockets
• Chapter 15 — Workers and Parallelism
• Chapter 16 — Streams and Pipes
• Chapter 17 — Advanced Patterns
• Chapter 18 — Deployment and Monitoring
• About the Author