Async: Zero to Hero Guide
Introduction Asynchronous programming is how we make programs do more than one thing at once without wasting time waiting on slow operations. Whether you’re building responsive web apps, data pipelines, or high-throughput services, “async” is a foundational skill. This zero-to-hero guide gives you a practical mental model, shows idiomatic patterns, walks through language-specific examples, and finishes with a curated list of resources to keep you going. You’ll learn: What async actually is (and isn’t) How it differs from threads and parallelism Real-world patterns like bounded concurrency, cancellation, timeouts, and retries How to implement these patterns in JavaScript/Node.js, Python (asyncio), and C# Testing and performance tips A practical learning path with vetted links Note: Async is a technique for handling latency and concurrency efficiently, commonly for I/O-bound work. CPU-bound tasks require different strategies (e.g., thread pools, processes, or offloading). ...