Nameless array in Typescript class?

Question

I'm relatively new to Typescript.

I am working through a tutorial and have some code like this:

export class Brushes {
  [key: number]: Brush;
}

As far as I can tell, it creates an indexable class so that I can do things like

const brushes: Brushes = {...}

and then

mybrush = brushes[2];

or whatever.

My question is, how do I tell what the total length of this "array class" is, since

mybrush.length;

is undefined?

Or is there a better way to do what I am trying to do?

Answer 1

I would take a different approach. Instead of creating an "indexable" class, I'd just store instances of the class in an array.

const brush: Brush = {...};
const arrayOfClasses = [];
arrayOfClasses.push(brush);

const myBrush = arrayOfClasses[0];

arrayOfClasses.length; ## 1

Would that be applicable given your use case? Or do you need to use classes for some reason?