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Learning Object-Oriented Programming by Gastón C. Hillar

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Working with composition in JavaScript

As previously explained, JavaScript doesn't provide support for interfaces or multiple inheritance. JavaScript allows you to add properties and methods on the fly; therefore, we might create a function that takes advantage of this possibility to emulate multiple inheritance and generate an object that combines two existing objects, a technique known as mix-in.

However, instead of creating functions to create a mix-in, we will create constructor functions and use compositions to access objects within objects. We want to create an application by taking advantage of the feature provided by JavaScript.

Declaring base constructor functions for composition

The following lines show the code for the ComicCharacter

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