What is optional chaining?

Short answer: A safe way to access nested properties without throwing an error if something is undefined or null. Example: console.log(user?.address?.city);

Example code

A safe way to access nested properties without throwing an error if something is undefined or null. Example: console.log(user?.address?.city);

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.