Write code to explain higher-order function

Q: Write code to explain higher-order function

const greet = function(name){ return function(m){ console.log(`Hi!! ${name}, ${m}`); } } const greet_message = greet('ABC'); greet_message("Welcome To GeeksForGeeks")

Difficulty: 6/10

callbacks, function composition, async utilities

All examples of map,reduce, filter, currying and functions with callbacks are examples of HOC.

javascript

Scenario Questions

0-2 years experience

1We have an array of numbers and need to double each value. Write a function that takes a callback to apply the transformation. How would you implement it using a higher‑order function?
2Suppose you need to filter a list of users based on a predicate you’ll receive at runtime. Show how you'd write a higher‑order function that returns the filtered list.

2-5 years experience

1Your team added a utility `mapAsync` that takes an array and an async callback, but it's causing unhandled promise rejections in production. Walk me through how you'd debug it and what changes you'd make.

Follow-up Questions

What happens if the callback throws an error?
How would you preserve the `this` context inside the higher‑order function?
Can you compare the memory impact of chaining versus composing functions?