Your fetch() Is Still Running After the User Left – How to Detect, Cancel, and Optimize

Editors Pick, JavaScript, Must Read /

Single-page applications often continue running fetch() requests after users navigate away, wasting bandwidth and server resources while potentially causing memory leaks. This guide explains why it happens and provides actionable solutions. Key Insight: Use AbortController tied to component lifecycle, clean up in useEffect/onUnmounted, and verify with Chrome DevTools Network tab. Table of Contents The Problem […]

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Debounce vs Throttle in JavaScript: Simple Guide + Code

Debounce vs Throttle in JavaScript: Complete Comparison + Code

Editors Pick, JavaScript, Must Read /

Featured Snippet Debounce and throttle are two handy JavaScript techniques that help control how often a function runs when dealing with rapid-fire events like scroll, resize, or keypress. Debounce waits for the event to settle before firing, while throttle ensures a function runs at fixed intervals. Both improve performance and prevent unnecessary calls. Table of

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Fetch API Guide: GET, POST, PUT, DELETE Examples

How to Use Fetch API: GET, POST, PUT, DELETE Examples

Editors Pick, JavaScript, Must Read, Reviews /

The Fetch API provides a modern and cleaner way to make HTTP requests in JavaScript. Whether you’re building front-end apps, connecting to REST APIs, or working with JSON data, Fetch makes the process simple and flexible. In this guide, you’ll learn how to use Fetch for GET, POST, PUT, and DELETE requests with clean examples.

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Event Loop in JavaScript: Visual Guide for Beginners

Event Loop in JavaScript: Visual Guide for Beginners

Editors Pick, JavaScript, Must Read, Reviews /

The JavaScript event loop lets a single-threaded runtime handle async work. It empties the call stack, runs microtasks (Promises), then handles macrotasks (setTimeout, UI events) so the UI stays responsive. Introduction Call Stack and Single Threaded Nature Tasks vs Microtasks Event Loop Step-by-Step Code Examples Common Gotchas Visualizing with a Timeline FAQ Introduction Alright, let’s

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Var vs Let vs Const: Which to Use in JS?

Var vs Let vs Const: What to Use in Modern JavaScript?

Editors Pick, JavaScript, Must Read /

var vs let vs const In modern JavaScript, use const by default, let when the value will change, and avoid var because of function scoping and hoisting pitfalls. This approach keeps your code predictable, reduces bugs, and aligns with today’s best practices in ES6+ development. If you’re working with JavaScript regularly, you’ve definitely run into

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JavaScript Async/Await Guide: From Basics to Advanced

How Async/Await Works in JavaScript (Beginner to Advanced Guide)

JavaScript /

Async/await makes JavaScript asynchronous code feel almost synchronous. An async function always returns a promise, and await pauses only that function until the promise resolves. The result? Cleaner flow, easier debugging, and far fewer .then() pyramids. It’s basically promises… but without the drama. Table of Contents What Is Async/Await? If you’ve ever stared at a

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JavaScript Closures Explained with Real Examples

JavaScript Closures Explained with Real-World Examples

Editors Pick, JavaScript, Must Read /

JavaScript closures let a function remember and access variables from its lexical scope even after the outer function has finished running. They power private variables, function factories, memoization, event handlers, and patterns used across modern JavaScript frameworks. A closure basically mixes scope, memory, and execution context into one extremely useful abstraction. Introduction Closures are one

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