How to achieve the functionality of multiple inheritance using Object.create()

Seeking insights on implementing multiple inheritance in JavaScript. Various methods exist, each with pros and cons. However, there lacks a comprehensive analysis of Object.create() presented in an understandable manner. After conducting experiments, I have devised an approach that successfully achieves multiple inheritance using Object.create() (refer to JSFiddle link below).

https://jsfiddle.net/etymhecv/

In the JSFiddle example above, the variables p represents a Person, e symbolizes an Employee (inheriting from Person), and ae denotes an AlienEmployee (which inherits from both the independent class Alien and Employee). The test Person.isPerson(ae) correctly identifies an AlienEmployee as a type of Person.

Would appreciate insight on any potential drawbacks of the aforementioned approach, if any.

javascriptmultiple-inheritanceprototypal-inheritance

Answer №1

I have discovered a unique method that successfully achieves the concept of multiple inheritance

Incorrect:

> var ae = AlienEmployee.create("Zeuss", "4321", "Marsodian")
| AlienEmployee.isAlienEmployee(p)
< true
> Alien.isAlien(p)
< false

In JavaScript, it is not feasible to have true multiple prototypical inheritance as the prototype chain remains linear.

The usage of your `create` methods effectively applies a mixin pattern either through `Object.create/defineProperties(…, Object.getOwnPropertyDescriptors(…))` or with `extend/Object.assign`, but this differs from the dynamic inheritance we are accustomed to with `Object.create`.

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