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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: Higher Order Functions

Understand how higher order functions work in JavaScript by reviewing solutions that analyze common functions such as setTimeout, map, and reduce. This lesson helps you identify which functions qualify as higher order and prepares you to answer related interview questions confidently.

We'll cover the following...

Question 1: Solution review

In the previous lesson, you were given the following code:

Node.js
const func1 = function(num){
  return function(){
    if(typeof num == 'NaN'){
      return "Not a number"
    }else{
      return typeof(num)
    }
  }
}

For the code above, you had to answer the following question:

Explanation

Higher-Order functions accept functions as parameters or return a function as an output.

From the code, we can see that func1 does not take a ...