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Ilya Kantor 2019-08-17 20:28:00 +03:00
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1-js/09-classes/07-mixins/article.md
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In JavaScript we can only inherit from a single object. There can be only one `[[Prototype]]` for an object. And a class may extend only one other class.
But sometimes that feels limiting. For instance, I have a class `StreetSweeper` and a class `Bicycle`, and want to make their mix: a `StreetSweepingBicycle`.
But sometimes that feels limiting. For instance, we have a class `StreetSweeper` and a class `Bicycle`, and want to make their mix: a `StreetSweepingBicycle`.
Or we have a class `User` and a class `EventEmitter` that implements event generation, and we'd like to add the functionality of `EventEmitter` to `User`, so that our users can emit events.
There's a concept that can help here, called "mixins".
As defined in Wikipedia, a [mixin](https://en.wikipedia.org/wiki/Mixin) is a class that contains methods for use by other classes without having to be the parent class of those other classes.
As defined in Wikipedia, a [mixin](https://en.wikipedia.org/wiki/Mixin) is a class containing methods that can be used by other classes without a need to inherit from it.
In other words, a *mixin* provides methods that implement a certain behavior, but we do not use it alone, we use it to add the behavior to other classes.