Functions & Scope

Stop your app from firing hundreds of events per second learn how throttling can make your code faster, smoother, and more efficient. Introduction If you’ve ever logged a scroll or resize event in JavaScript, you’ve probably seen this chaos: window.addEventListener(“scroll”, () => console.log(“Scrolling…”)); Now open the console and scroll hundreds of logs per second! 😬…

Forget the theory, here’s how debouncing really behaves in real-world JavaScript apps (with code, visuals, and gotchas). Introduction You’ve probably seen it debounce() mentioned in blog posts or StackOverflow threads. But when someone asks, “How does debounce actually work?”, things get fuzzy. Here’s the truth: Debouncing isn’t magic. It’s just a clever use of setTimeout() and clearTimeout()…

Stop spamming your APIs, optimize your event handlers, and learn how debounce really works from scratch. Introduction If your JavaScript app ever: …you’ve probably needed a debounce function. Most developers just grab it from Lodash (_.debounce) and move on. But do you actually know how debounce works under the hood? In this post, you’ll learn: By the…

Learn how to combine small, reusable functions into powerful pipelines for cleaner, faster, and more maintainable code. Introduction If you’ve ever written this: const result = exclaim(toUpperCase(trim(input))); You’ve already used function composition; you just didn’t call it that. Function composition is the art of combining smaller functions into bigger ones, where the output of one…

JavaScript generators aren’t just about iteration; they can tame infinite loops and streams of data without blowing up your memory or CPU. Introduction Every developer has faced this dilemma: 👉 Enter JavaScript generators. Generators let you pause and resume functions, which means you can write infinite loops that behave gracefully: no crashes, no runaway memory, and…

Stop writing messy initialization code in JavaScript. Here’s how self-defining functions make your code cleaner, faster, and easier to maintain. Introduction We’ve all written code like this before: Example mistake: let config;function loadConfig() { if (!config) { console.log(“Fetching config…”); config = { apiKey: “123”, theme: “dark” }; } return config;}console.log(loadConfig()); // Fetching config…console.log(loadConfig()); // Still…