The JavaScript Roadmap

What JavaScript is, where it runs, how a page loads it, how to use the console, and your first real program. No experience needed.

Variables with let and const, the seven primitive types, how numbers and strings really work, type conversion, and == vs ===.

Operators and precedence, &&, || and ??, if/else and the ternary, switch, every kind of loop, break and continue, and for...of vs for...in.

Write and call functions, the three ways to define them, default and rest parameters, scope, hoisting, closures, callbacks, recursion and pure functions.

String methods, Unicode and emoji, regular expressions, Math and rounding money, Intl formatting, and dates and time zones without the usual bugs.

Create, read, change, search, transform, sort, copy and flatten arrays: every array method you'll use daily, with the traps that cause real bugs.

Objects from the ground up: literals, reading and changing properties, destructuring, looping, references, JSON, getters, setters and descriptors.

How `this` is decided, call/apply/bind, the prototype chain, what `new` really does, classes, private fields, inheritance and composition.

How JavaScript sees and changes a web page: the DOM tree, finding elements, changing text, classes and styles, building elements and keeping it fast.

Make pages react: event listeners, bubbling and capturing, delegation, default actions, mouse, keyboard and form events, debounce, throttle and custom events.

Blocking vs non-blocking code, timers, the event loop, callbacks, promises, combinators and async/await, with exact output you can predict.

Talk to servers with fetch, remember data with web storage, read URLs, build client-side routes, watch the page with observers and animate smoothly.

Split code into ES modules, load code on demand with import(), manage packages with npm, and meet bundlers, linters, formatters and TypeScript.

Read any error and its stack trace, handle failures with try/catch, throw helpful errors, debug in DevTools, write defensive code and test it.

Iterators, generators, Map and Set, weak references, symbols, Proxy and Reflect, tagged templates, memory and garbage collection, and strict mode.

Functional and design patterns, performance, defensive web security, Web Components, interview deep dives, and a capstone task app built step by step.