What is the event delegation pattern?

Short answer: Instead of attaching listeners to every element, attach one listener to a parent — it captures events from its children using bubbling.

Example code

document.querySelector('#list').addEventListener('click', e => { if (e.target.tagName === 'LI') console.log(e.target.textContent); }); Follow me on LinkedIn: ✅ Improves performance and memory usage.

Real-world example (ShopNest)

ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.