JavaScript in One Month

What's covered

1. 1 · Objects & syntax, deeper Every property carries hidden metadata, value plus three on/off flags. A plain x=1 sets all true; defineProperty defaults them false.
2. 2 · Iteration & generators An iterator is any object with a next() that returns { value, done }, call it until done:true .
3. 3 · Async in practice A promise is a value that isn't ready yet, an object you can store, pass around and return, that will settle later.
4. 4 · The event loop & microtasks JS runs one thing at a time, sync code to completion, then drain ALL microtasks, then ONE macrotask, repeat forever.
5. 5 · The DOM & events The DOM is the browser's live object model of your HTML, a tree of nodes you can read and rewrite, and the page updates the instant you do.
6. 6 · Fetch, JSON & HTTP fetch(url) returns a promise for a Response, the headers arrive first; you then read the body with a second await.
7. 7 · Regular expressions A regex is a tiny pattern language for matching text, built from classes, anchors & quantifiers , carrying a set of flags.
8. 8 · Modules & tooling Each file is its own scope ; it shares values by export and pulls them with import, no globals leak between files.
9. 9 · Error handling & robustness An error is just an object, name + message + stack, that you throw, and try/catch/finally controls the unwinding.
10. 10 · A TypeScript primer TypeScript is JS plus a type layer checked at compile time, then erased, at runtime it's plain JavaScript.
11. 11 · Testing A test is code that calls your code and asserts the result, fail loud now, not in production.
12. 12 · Node.js essentials Node = the same V8 engine the browser uses, plus system APIs (files, network, processes) instead of a window or DOM.
13. 13 · Patterns & functional JS Build with pure functions over immutable data, same input, same output, no surprises.
14. 14 · Project Quote Board (browser)
15. 15 · Project Log Summarizer (Node CLI)
16. 16 · Cheat sheet The working-knowledge tier on two pages, scan, don't read.