Web Development

The Microtask Queue Promises don't execute immediately after they resolve. They wait their turn. The Microtask Queue is a queue that stores callbacks from resolved Promises before they're executed. Consider:

console.log("A");

Promise.resolve().then(() => console.log("B"));

console.log("C");

The output is:

A
C
B

Even though the Promise resolves immediately, its callback is placed into the Microtask Queue. JavaScript finishes the current execution first. Only then does it process queued microtasks. This is the reason why Promise callbacks always run after synchronous code, even when no network request is involved.

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🔅 Server actions in NextJS Server actions refer to tasks and operations that are executed on the server side. Next.js, being a hybrid framework, allows you to perform both server-side and client-side rendering, giving you the flexibility to handle different types of data fetching and processing.

If you design or vibe code, save this list. - Kokonut UI : Animated React components - Motion Sites : Website and animation inspiration - Motion .dev : Web animation - Anime .js : JavaScript animation - Particles Casberry : interactive particles and WebGL effects

History API in JavaScript Modern websites don't reload every page anymore. So how does the browser change pages without asking the server for a new HTML document? The answer is the History API. The History API lets JavaScript change the current URL without triggering a full page refresh. Frameworks like React Router and Next.js use:

history.pushState(...)

instead of:

window.location = "/dashboard";

The browser updates the address bar. The existing JavaScript application stays alive. Only the required UI changes. This is why navigation inside a React application feels instant. The browser isn't downloading another website. It's displaying a different view inside the one that's already running.

Why do we type those two slashes in https://? It turns out the double slash comes from an old 1980s computer system called Apollo Domain OS. Back then, if you typed a single slash (/), your computer looked for files inside its own hard drive. The engineers at Apollo needed a way to tell the computer,

Hey, don't look inside yourself, look out at the network.

So, they decided two slashes (//) would mean "network." When Tim Berners-Lee was building the World Wide Web, he just borrowed that exact rule. ➖ The colon (https:) meant this is the protocol, and ➖ The double slash (//) meant the web address is coming next. The funny part is he later admitted it was a total mistake. The computer didn't actually need the slashes to understand the link. He joked that if he had just left them out, the world would have saved millions of hours of typing. This comment answered it right. 👏

Web Devs

Do you know why URLs have two slashes (//) after http:?

Not 1. Not 3. Why 2? 🤔

What Actually Happens During npm install npm install does far more than download packages. It first reads your package.json. Then it looks at your package-lock.json, which records the exact dependency versions your project expects. Next it builds a dependency tree. If Package A needs React 18.2.0 and Package B also needs React 18.2.0, npm can reuse that version. If another package requires React 17, npm may install both versions because their requirements don't match. Only after resolving that entire tree does npm download packages and place them into node_modules. That's why deleting package-lock.json can unexpectedly change working code. The lock file isn't just a cache. It's a snapshot of the dependency tree your project was built and tested with.

CSS Text Effects This is a library of 90 animated text effects built with pure CSS; aurora gradients, glitches, split-flap boards, liquid fills and other lesser-seen tricks. No JavaScript, no dependencies. Copy the self-contained CSS for any effect, or grab a ready-made Prompt to have your coding agent recreate it.  Try it at: https://text-effects.colorion.co/ Follow our page for more.

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Git Rebase Explained A rebase takes your commits and moves them on top of another branch, creating a cleaner history. Imagine:

main:
A---B---C

feature:
     D---E

After rebasing:

main:
A---B---C---D---E

Your feature looks like it was created from the latest version of main. Teams use it: - To maintain cleaner commit history. - For easier code reviews. - Fewer unnecessary merge commits. 📌 The rule: Rebase your local work. You have to be careful rebasing commits that other people already use.

React Context (How to stop your React components from rendering unnecessarily)

Your useEffect Might be Doing Too Much

An effect is code that runs after React updates the screen, usually for interacting with things outside React.

Examples: Fetching data, Subscribing to events, Updating the document title. The problem starts when developers use it for normal calculations. Example:

useEffect(() => {
  setTotal(price * quantity)
}, [price, quantity])

This creates unnecessary work. total can already be calculated during rendering. The effect adds another state update, another render, and another thing to debug. A useful question:

Does this code synchronize with something outside React?

If not, it probably doesn't belong inside useEffect.

📌 React Isn't the Problem A React app doesn't become slow overnight. It becomes slow when unnecessary render accumulates overtime.

A render is React running a component again to determine what should appear on the screen.

Most developers reach for useMemo, useCallback, or another optimization as soon as performance drops. That's often treating the symptom. The better question is: Why did this component render in the first place? Open React DevTools and enable Highlight updates. Click around your app. If your navigation bar flashes every time you type into a search box, you've already found a performance issue.