Higher Order Array Methods in JavaScript (forEach and reduce)

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Higher-order function is a function that accepts another function as an argument and returns a function as a result. The function passed in as an argument is called callback function. Higher-order functions allow developers to create more flexible, concise and reusable codes which are highly critical in a software development environment.

There are various higher-order array methods that provide different functionality and usefulness in JavaScript. In this article, we will mainly focus on the most practised higher-order methods, forEach and reduce methods.

In programming, there are many ways to write the codes to obtain the same result. This article not only provides the explanation and the solution of the problem by using higher-order array methods but also other possible ways to solve the problem to obtain the same output.

First of all, we can check different types of available JavaScript higher-order methods in the console by creating a new array and running the codes as below.

const newArray = [1, 2, 'a', 'b']
console.log(newArray.__proto__)

The output in our console shows different higher-order array methods that we can utilise in our codes.