Posts tagged javascript

A beginner Next.js tutorial: build a small coffee menu with the App Router. Create a page, a layout, a dynamic route, and fetch data on the server.

Learn addEventListener step by step: handle clicks, typing and form submits, use the event object, and avoid the mistakes that break listeners.

TypeScript is JavaScript with types. See what it catches, what it costs, and a step-by-step path from JavaScript to TypeScript.

Destructuring unpacks objects and arrays into variables in one line. Learn renaming, defaults, nested values, function arguments and the undefined error.

The DOM is the browser's live version of your HTML. Learn how JavaScript finds elements, changes text and classes, reacts to clicks and builds new ones.

Number(), parseInt() and parseFloat() each handle text differently. See which to use, what they do with tricky input, and how to check the result.

A one-hour coding practice you can repeat on a weeknight: recall, one exercise you write, a short note, and a start line for tomorrow.

A practical order for learning React: components, then props, then state. You will know what to practice first and what can wait.

See what changes after React: which file is a page, when a component needs the browser, and why a notes list can skip useEffect.

Stuck watching tutorials but unable to build alone? Learn the four causes of tutorial hell, how start.dev solves each, and a weekly routine to break out.

Prepare for a junior React interview: the core concepts to explain, the coding tasks to practise, and short example answers for state, props, effects and lists.

Ten JavaScript interview questions junior developers get asked, with short answers, runnable examples, and the follow-ups interviewers like to ask next.

What useEffect really does, when it runs, and how the dependency array and cleanup function work. Simple examples for fetching data, timers and page titles.

Learn the JavaScript array methods you will use daily: map, filter, find, some, every, reduce and sort, with runnable examples on one shopping cart.

Learn what Express middleware is, how next() moves a request through the pipeline, and how to write a logger, an API-key gate and an error handler.

Build your first REST API with Node.js and Express in about 50 lines: routes, JSON, POST, PUT and DELETE, tested with curl, plus where to go next.

Learn how REST APIs work by following one request from client to server and back: URLs, methods, headers, status codes, JSON, and what REST actually means.

Python or JavaScript as your first language? See the same program written both ways, where each trips beginners up, and why JavaScript takes you furthest.

useState or useReducer? See the same cart built both ways, the signs it's time to switch, and a simple rule of thumb for choosing in your React components.

A plain-English guide to JavaScript async/await: what it really does, how it relates to promises, and the mistakes that trip people up.

You copied an array, changed the copy, and the original changed too. Here is what a JavaScript variable actually holds and how to copy safely.

You can read JavaScript but keep forgetting how to write it. The difference between an expression and a statement explains most of the syntax.

Learn JavaScript closures with tested examples: counters, the var vs let loop question, private state, debounce, and the stale closure bug in React hooks.