How to make an iterator out of an ES6 class

Question

How would I make an iterator out of an ES6 class in the same manner as JS1.7 SomeClass.prototype.__iterator__ = function() {...} syntax?

[EDIT 16:00]

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Answer 1

Define a suitable iterator method. For example:

class C {
  constructor() { this.a = [] }
  add(x) { this.a.push(x) }
  [Symbol.iterator]() { return this.a.values() }
}

Edit: Sample use:

let c = new C
c.add(1); c.add(2)
for (let i of c) console.log(i)