ES6 Classes - Updating Static Properties

Question

I am trying to figure out alternative ways to set a static (or class) property an ES6 Class and then change it after new instances of the class are created.

For exa

Answer 1

There's no such thing as static all = [] in ES6. Class instance and static fields are currently stage 3 proposals which can be used via a transpiler, e.g. Babel. There's already existing implementation in TypeScript that may be incompatible with these proposals in some way, yet static all = [] is valid in TS and ES.Next.

Geo.all = [];

is valid and preferable way to do this in ES6. The alternative is getter/setter pair - or only a getter for read-only property:

class Geo {
  static get all() {
    if (!this._all)
      this._all = [];

    return this._all;
  }

  constructor() { ... }
}

Tracking instances in static property can't generally be considered a good pattern and will lead to uncontrollable memory consumption and leaks (as it was mentioned in comments).