What is the difference between shallow and deep equality?

Short answer: Shallow equality: Compares only top-level properties. Deep equality: Compares nested values recursively.

Example code

{a:1} === {a:1} // false (different refs) Use libraries like Lodash’s _.isEqual() for deep comparison. Follow me on LinkedIn:

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.