DEV Community

Discussion on: Singleton in JavaScript

View post

Replies for: Sorry, I meant not extending but inherit. You can inherit from object literals by just creating new object based on your original one, like here. I...

 
avalander profile image
Avalander •

That's not what I would define as inheriting, you're cloning the object and adding extra properties to the clone. Nothing prevents anyone from cloning your singleton instance either, though, as long as they remember to carry on the prototype.

const clone = Object.assign(
    Object.create(SingletonClass.prototype),
    instanceOne,
    { shoutName() { return this.name.toUpperCase() }}
)

console.log(clone.shoutName())
Enter fullscreen mode Exit fullscreen mode
Thread Thread
 
tomekbuszewski profile image
Tomek Buszewski •

You are completely right, but here you are stepping away from the merit of the text, which is singleton design pattern. In JavaScript all (or are there some that aren't?) reference types can be cloned and those cloned modified.