What is functional programming in JavaScript?

Short answer: A style where functions are pure, stateless, and composable. Example: const double = x => x * 2; const square = x => x * x; const result = square(double(3)); // 36

Example code

A style where functions are pure, stateless, and composable. Example: const double = x => x * 2;
const square = x => x * x;
const result = square(double(3)); // 36

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.