The Mastering the Arcane Art of JavaScript-mancy series are my humble attempt at bringing my love for JavaScript to all other C# developers that haven’t yet discovered how awesome this language and its whole ecosystem are. These articles are excerpts of the super duper awesome JavaScript-Mancy book a compendium of all things JavaScript for C# developers.

In the previous articles of this series you have dived into Object Oriented Programming in JavaScript. You’ve learned about object initializers, factory functions, about constructor functions, prototypical inheritance, polymorphism, how to mimick C# classes with ES5 and even about ES6 classes.

So far we’ve kept ourselves very close to techniques and concepts that you are accustomed to in C# so as to make you a comfortable inhabitant of the world of JavaScript. So! Now that you are almost a mighty JavaScript-mancer we’re going to let go of C# for a little while and embrace the dynamic nature of JavaScript. Welcome to a world of flexibility and freedom! The realm of object composition!

This time by the hand of Mixins.

The Mastering the Arcane Art of JavaScript-mancy series are my humble attempt at bringing my love for JavaScript to all other C# developers that haven’t yet discovered how awesome this language and its whole ecosystem are. These articles are excerpts of the super duper awesome JavaScript-Mancy book a compendium of all things JavaScript for C# developers.

In the last article you learned how to implement classes in JavaScript without relying in ES6 classes which puts you in a prime position to learn ES6 classes:

1. Now you have a deep understanding about the underlying implementation of ES6 classes which are just syntactic sugar over constructor functions and prototypes. This will not only help you understand how ES6 classes work but also how they relate to the rest of JavaScript.
2. You appreciated how you needed to write a lot of boilerplate code to achieve the equivalent of both classes and classical inheritance. With this context the value proposition of ES6 classes becomes very clear as they bring a much nicer syntax and developer experience to using classes and classical inheritance in JavaScript.

In any case, ES6 classes are great for developers that are coming to JavaScript from a static typed language like C# because they offer a perfect entry point into the language. You can start using classes just like you’d do in C#, and little by little learn more about the specific capabilities of JavaScript.

Behold! ES6 classes!

The Mastering the Arcane Art of JavaScript-mancy series are my humble attempt at bringing my love for JavaScript to all other C# developers that haven’t yet discovered how awesome this language and its whole ecosystem are. These articles are excerpts of the super duper awesome JavaScript-Mancy book a compendium of all things JavaScript for C# developers.

In this article we are going to take a deep-dive into how to emulate classical inheritance in JavaScript and get to the nearest equivalent to what you are accustomed to in C#. We will focus in the alternatives we had prior to ES6 classes so that you can work with classes even if you are stuck in ES5 and so that you can understand the underlying implementation of ES6 classes which are just syntactic sugar over the JavaScript prototypical inheritance model.

The Mastering the Arcane Art of JavaScript-mancy series are my humble attempt at bringing my love for JavaScript to all other C# developers that haven’t yet discovered how awesome this language and its whole ecosystem are. These articles are excerpts of the super duper awesome JavaScript-Mancy book a compendium of all things JavaScript for C# developers.

In the last two chapters of these OOP mini-series we discussed the pillars of OOP in JavaScript - encapsulation, information hiding and inheritance - and how they differ from what we are accustomed to in C#. In this last chapter we discuss polymorphism and how JavaScript makes it dead simple with the concept of duck typing.