Async Programming Patterns Skill Master asynchronous programming - the foundation of Node.js performance and scalability. Quick Start Three pillars of async JavaScript: 1. Callbacks - Traditional pattern (error-first) 2. Promises - Modern chainable pattern 3. Async/Await - Synchronous-looking async code Core Patterns Callbacks → Promises → Async/Await Evolution Sequential vs Parallel Promise Methods Learning Path Beginner (1-2 weeks) - ✅ Understand event loop - ✅ Master callbacks - ✅ Learn Promises basics - ✅ Practice async/await Intermediate (3-4 weeks) - ✅ Error handling patterns - ✅ Sequen…