How to Create Singleton Classes in JavaScript - Design Patterns Tutorial

In this video tutorial I'll be showing you a technique to create a Singleton Class in JavaScript with ES6 classes.

Singleton classes are used when you only want a single instance of a class to be created - this is useful for things like "settings" or "environmental variable" accessors.

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[nueno]

you can even do "class Settings { static shared = new Settings() /* .. */ }" so it's obvious for any reader that Settings is a singleton, even without looking into the implementation of the Settings class.

[adampielach]

Great video! Keep 'em comming, Dom!

[smoothbeak]

That was pretty interesting, not something I had ever considered doing before

[DusanResin]

Very nice solution! Thanks for sharing.

[mattcroat]

Thanks! I'm going to look more into design patterns 👍

[montebont]

Nice one but looks a bit like a solution looking for a problem.
From my (PHP) background this looks like a factory pattern which produces a new class instance. Static methods in the factory will do just that...🙂 And IMHO that's the real use case

[bradical]

So what if two users are using the same website, would they be sharing the same values in the constructor?

[chamnil]

Sir, please explain why did you say chance of one in four thousand nearly at the end of the tutorial, for getting the same objects.

[munafhajir]

Nice Video, need more videos like this want to understand how to select best structure and design pattern for your application

[SoldierXfreedom]

Whats the point of using a class for this? Cant I just use a Settings object that way I dont have to create an instance?

[ginnerzapata]

thanks a lot for your videos on OOP with JS classes <3

[onthefly--]

Hi, thanks for this tutorial.
Here's a question. In my case I load another html file, and then going from href to another html file.
On that file, the instance is no longer defined for some reason, can you think of a reason why that is?


Thanks, Shefy

[matheusicaro]

What this a theme? It's pretty!
Thanks for video.

[rainsaarmae]

Using VS code to develop node.js.

I'm getting error "Property 'instance' does not exist on type 'typeof Settings'."

[taylorgraham]

Keyboard is too loud. Good video though