What is the difference between map() and forEach()?

Short answer: Method Returns Chainable Use Case forEach () undefin ed ❌ No Iteration map() New array ✅ Yes Transformation Example: [1,2,3].map(x => x*2); // [2,4,6]

Example code

Method Returns Chainable Use Case forEach () undefin ed ❌ No Iteration map() New array ✅ Yes Transformation Example: [1,2,3].map(x => x*2); // [2,4,6]

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.