Clean Code JavaScript and Node training course

3. Objects & Prototypes: How JavaScript Really Does OOP

• Prototype chain, property lookup, and why class is mostly syntax sugar
• Objects vs Maps/Sets, and picking structures for clarity and performance
• Composition vs inheritance: what’s idiomatic in modern JS

4. Types, Coercion, and “Weird JS” You Need to Know

• Primitives vs objects, truthiness, == vs ===, and coercion traps
• Numbers, NaN, BigInt, and precision gotchas (money, timestamps, floats)
• Edge cases that cause real bugs (null/undefined, 0/-0, Object.is)

5. Async JavaScript: Promises, async/await, Events, and Concurrency

• Promise fundamentals: chaining, error handling, and avoiding “promise soup”
• Concurrency patterns: all, allSettled, timeouts, retries, cancellation with AbortController
• Async / Await
• Event loop mental model and common async pitfalls (leaks, unhandled rejections)

6. Functional JS Patterns: Immutability, Composition, and Practical FP

• Immutability in practice: copying strategies and avoiding accidental mutation
• Composition: map/filter/reduce, pipelines, pure functions, and side-effect boundaries
• Practical FP tools: currying, memoization, and when FP genuinely helps

7. Node.js Tools: Files, HTTP, Streams

• Node runtime basics: filesystem, paths, env vars, and process lifecycle
• HTTP servers/clients: routing basics, JSON APIs, validation, and error responses
• Streams: piping, backpressure intuition, and handling large data safely

8 Code Organisation: Scaling a JS Codebase Without Chaos

• Project structure patterns (layers vs features, packages/monorepos, shared utilities)
• Designing APIs between modules: contracts, dependency direction, and avoiding spaghetti imports
• Error handling and configuration patterns (env management, logging boundaries, “where does this live?”)