Mastering Inheritance from Built-in Objects in JavaScript

Explore How to Inherit from Built-in Objects for Advanced JavaScript Programming

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In JavaScript, inheriting from built-in objects can be a powerful technique to extend functionality and create custom objects tailored to your needs.

In this guide, we’ll delve into the process of inheriting from built-in objects, understand its benefits, and provide clear examples to help you implement this technique effectively.

Understanding Inheritance from Built-in Objects

In JavaScript, built-in objects like Array, String, and Object can serve as prototypes for custom objects. Inheriting from these objects allows you to leverage their existing functionality while adding custom features specific to your application.

Inheriting from Arrays

Let’s start by inheriting from the Array object to create a custom object:

function CustomArray() {
  Array.call(this); // Call the Array constructor with 'this' context
}

CustomArray.prototype = Object.create(Array.prototype);
CustomArray.prototype.constructor = CustomArray;

const customArray = new CustomArray();
customArray.push(1, 2, 3);

console.log(customArray.length); //…