What are higher-order functions?

Short answer: A higher-order function is a function that takes another function as an argument or returns a function. They are key to functional programming in JavaScript. Example: function greet(name) { return `Hello, ${name}`;

Example code

} Follow me on LinkedIn: function processUser(callback) { return callback("Alice");
} console.log(processUser(greet)); // Hello, Alice Functions like map(), filter(), and reduce() are higher-order functions.

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.