>> * The creation of the generator object. This is where the generator function >> is like a constructor and where you’d expect `this` to refer to the >> generator object. > > Nope, not a constructor (and if you don't call with 'new', what is 'this', > pray tell?).
I only mean it is “like a constructor” in that it is a function that, when invoked (in some way), returns a fresh object. The main purpose of a generator function is to specify the behavior of the generator object. But it also serves as its constructing entity. A double duty. >> * The behavior. This is where the generator function is like a real function. >> >> A result of this mixing of concerns is that using `next()` to start a >> generator feels slightly off and that the argument of that first `next()` >> invocation is completely ignored. > > We've discussed a special generator head form to declare that name, but not > for ES6. For now it's Pythonic, except we decided not to throw if the initial > .next call passes a non-undefined value. > >> Alas, I have no idea how to disentangle these concerns, but it would be nice >> if we were able to. > > We're not changing generators at this point, but Nicholas's request for a way > to reference the running generator-iterator instance is worth discussing > more. It can't and shouldn't be 'this'. Does it violate POLA to provide (via > another special form) for all generators? Users can provide their own > bindings as noted, so is it a big problem? I’d pass the generator object reference to the generator function via `next()`, as the first step after creating the generator object. Not pretty, but relatively clean. > I think the task.js reference, and ES7 async/await, point to a better > direction: use helpers (libraries now, syntax soon) to automate harder and > avoid the need for the "me" reference. I agree, I can’t think of a solution that wouldn’t be much too complicated for the minor problem that it solves. -- Dr. Axel Rauschmayer [email protected] rauschma.de
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