Clear up misconceptions about microtasks and macrotasks. Learn how the JavaScript event loop actually schedules Promise callbacks, setTimeout, MutationObserver, and Node's process.nextTick - with concrete examples and practical rules you can use today.
Understand how microtasks and macrotasks differ in the JavaScript event loop, see compact examples that expose surprising ordering and starvation issues, and learn practical patterns to use each correctly in browsers and Node.js.
Cut through the noise: learn what the JavaScript event loop actually does, why common claims (like “setTimeout(0) runs before promises”) are wrong, how browsers and Node differ, and how to reason reliably about async code.
A deep dive into microtasks and macrotasks in JavaScript: what they are, how the event loop treats them, how they affect rendering and UX, illustrative diagrams and real-world examples, plus practical guidance to avoid performance pitfalls.