6 articles
You set a 100ms timeout and it fires at 340ms. No bugs, no errors — just a mysteriously late callback. Understanding why Node.js delays setTimeout is the key to writing non-blocking, predictable async code.
JavaScript's Array.sort() converts elements to strings before comparing them by default — which means numbers like 10 and 100 sort before 9. Here's why it happens and exactly how to fix it.
Most developers assume fetch() throws an error when a request fails. It doesn't. A 404 or 500 response resolves the promise just fine, and your app keeps running on garbage data without a single warning.
Stale closures are one of the sneakiest sources of memory leaks in React. Your component unmounts, but callbacks and timers keep firing — pointing at state that no longer exists. Here's how to track them down and fix them for good.
Destructuring nested objects in JavaScript looks clean until you hit undefined at runtime and have no idea why. Learn exactly why this happens and how to fix it with defaults, optional chaining, and safe patterns.
Unhandled promise rejections in Node.js can swallow errors silently, then crash your process hours later with no useful stack trace. Here's how to catch them early, trace them back to their source, and fix them for good.