JavaScript Articles
What Is Server-Side Rendering?
Server-side rendering (SSR) generates a page's full HTML on the server for each request, so the browser receives complete, visible markup immediately rather...
What Is Tree Shaking?
Tree shaking is a build-time optimization that removes unused exports from the final bundle, based on static analysis of which code is actually imported and...
What Is Minification in Web Development?
Minification removes unnecessary characters from source code — whitespace, comments, and sometimes shortening variable names — without changing its behavior,...
npm install vs npm ci — What's the Difference?
npm install resolves and installs dependencies, potentially updating the lockfile if it doesn't match package.json exactly; npm ci installs strictly from the...
Server-Side Rendering (SSR) vs Client-Side Rendering (CSR) — What's the Difference?
SSR renders a page's HTML on the server and sends complete markup to the browser; CSR sends a mostly empty HTML shell and renders the page in the browser using JavaScript after it loads.
Cookies vs Local Storage vs Session Storage — What's the Difference?
All three store data in the browser, but differ in size limits, lifetime, and whether they're automatically sent to the server with every request.
async/await vs .then() in JavaScript
async/await and .then() both handle promises, but async/await reads like synchronous code and simplifies error handling with try/catch.
null vs undefined in JavaScript — What's the Difference?
undefined means a variable was declared but never assigned; null is an explicit 'no value' assigned intentionally. Learn how they compare and when each appears.
setTimeout vs setInterval in JavaScript
setTimeout runs a function once after a delay; setInterval repeats it on a fixed cycle. Learn the difference, drift issues, and how to clear each one.
Map vs Object in JavaScript — When to Use Each
Compare JavaScript's Map and plain Object for key-value storage: key types, iteration order, performance, and when each one is the better choice.
Debounce vs Throttle in JavaScript — What's the Difference?
Debounce delays a function until activity stops; throttle limits it to run at most once per interval. Learn when to use each with code examples.
Promise.all() vs Promise.allSettled() in JavaScript
Understand the difference between Promise.all() and Promise.allSettled() — when one rejected promise should fail everything versus when you need every result.
How to Flatten a Nested Array in JavaScript
Flatten a nested array in JavaScript with Array.prototype.flat(), including how to flatten to any depth and a manual recursive alternative.
Fixing "JavaScript Heap Out of Memory" in Node.js
Learn what causes the Node.js FATAL ERROR: Ineffective mark-compacts near heap limit crash and how to fix it by raising the heap size or fixing memory leaks.
How to Remove Duplicates From an Array in JavaScript
Remove duplicate values from a JavaScript array using Set, filter(), or reduce(), including how to dedupe arrays of objects by a key.
What Is a Closure in JavaScript? Explained With Examples
A closure is a function that remembers the variables from its outer scope even after that scope has finished executing. Learn how and why with examples.
How to Reverse a String in JavaScript
Reverse a string in JavaScript using split(), reverse(), and join(), plus a manual loop version and the pitfalls of each approach.