AlexWebLab

Explore a wide range of web development topics, from JavaScript to React and beyond, and uncover valuable insights to enhance your skills.

Latest 2 articles:

Race Conditions in UI State: How They Happen and How to Prevent Them

Security & Architecture

Race conditions are not just a backend problem. They happen in frontend state management whenever multiple async operations can resolve in an unpredictable order — and they are responsible for some of the most subtle and hard-to-reproduce bugs in React applications.

IntersectionObserver Internals: How the Browser Detects Visibility

Browser Internals

IntersectionObserver is the standard API for detecting when an element enters or leaves the viewport. Understanding how it works under the hood — and what its limitations are — helps you use it efficiently and avoid the subtle bugs that come from misunderstanding when callbacks fire.