What is a higher-order function?

Short answer: A function that accepts another function as a parameter or returns a function. Example: function multiplyBy(factor) { return x => x * factor; } const double = multiplyBy(2); console.log(double(5)); // 10

Example code

A function that accepts another function as a parameter or returns a function. Example: function multiplyBy(factor) { return x => x * factor;
}
const double = multiplyBy(2); console.log(double(5)); // 10

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.