https://spaghetti-code.net/en/tags/javascript/ Recent content in JavaScript on Spaghetti Code 🍝 https://spaghetti-code.net/images/og-default.png https://spaghetti-code.net/images/og-default.png Hugo -- 0.160.0 en Sun, 01 Nov 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/eslint-vs-prettier/ Sun, 01 Nov 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/eslint-vs-prettier/ ESLint catches bugs and bad patterns in your code; Prettier only reformats it. Here is why running both together causes conflicts, and the setup that avoids it. https://spaghetti-code.net/en/posts/react/react-useeffect-explained/ Thu, 29 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/react/react-useeffect-explained/ How React's useEffect dependency array works, why effects fire twice in development, what the cleanup function actually does, and the mistakes that cause loops. https://spaghetti-code.net/en/posts/fundamentals/regular-expressions-explained/ Wed, 28 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/regular-expressions-explained/ A regex engine doesn't scan the whole string at once. It walks the pattern token by token and backtracks on failure. How that works, and why it sometimes hangs. https://spaghetti-code.net/en/posts/typescript/typescript-generics-explained/ Tue, 27 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/typescript/typescript-generics-explained/ TypeScript generics keep the type you pass in instead of collapsing it to any. How inference, extends, keyof and defaults work, and when to skip generics. https://spaghetti-code.net/en/posts/javascript/intersection-observer-api/ Wed, 21 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/intersection-observer-api/ How the Intersection Observer API replaces scroll-and-debounce code for lazy-loaded images and infinite scroll, with rootMargin and threshold explained. https://spaghetti-code.net/en/posts/javascript/javascript-closures-explained/ Mon, 19 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/javascript-closures-explained/ A JavaScript closure keeps a function tied to the variables where it was created, even after that code returns. How closures work, and where they break. https://spaghetti-code.net/en/posts/nodejs/npm-vs-yarn-vs-pnpm/ Sat, 17 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/nodejs/npm-vs-yarn-vs-pnpm/ npm, Yarn, and pnpm read the same package.json but build node_modules differently. Compare install commands, lockfiles, workspaces, and when each breaks. https://spaghetti-code.net/en/posts/javascript/fetch-api-error-handling/ Wed, 14 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/fetch-api-error-handling/ fetch() resolves on 404 and 500 responses instead of rejecting, so a plain try/catch misses them. How to check response.ok, read error bodies, and add timeouts. https://spaghetti-code.net/en/posts/javascript/debounce-vs-throttle-javascript/ Thu, 08 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/debounce-vs-throttle-javascript/ Debounce vs throttle in JavaScript: debounce waits until events stop firing, throttle runs at a steady rate while they continue. How each works, which to use. https://spaghetti-code.net/en/posts/web/localstorage-vs-sessionstorage-vs-cookies/ Mon, 05 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/web/localstorage-vs-sessionstorage-vs-cookies/ Cookies, localStorage, and sessionStorage all hold data in the browser, but only cookies reach your server. Here is how to pick the right one and secure it. https://spaghetti-code.net/en/posts/javascript/javascript-async-await-event-loop/ Mon, 28 Sep 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/javascript/javascript-async-await-event-loop/ How JavaScript async/await runs on the event loop, why a promise callback beats setTimeout(0), and the fixes for missing awaits, slow loops and async forEach.