As an aside, I still feel that two concerns are mixed in a generator function:
* 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.
* 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.
Alas, I have no idea how to disentangle these concerns, but it would be nice if
we were able to.
> On 23 Nov 2014, at 01:55, Nicholas C. Zakas <standa...@nczconsulting.com>
> wrote:
>
> After playing around with generators for most of the day (and pretty much
> loving all of it), I ended up with a code example for async that looks like
> this:
>
> ```
> var fs = require("fs");
>
> var task;
>
> function readConfigFile() {
> fs.readFile("config.json", function(err, contents) {
> if (err) {
> task.throw(err);
> } else {
> task.next(contents);
> }
> });
> }
>
> function *init() {
> var contents = yield readConfigFile();
> doSomethingWith(contents);
> console.log("Done");
> }
>
> task = init();
> task.next();
> ```
>
> The thing that immediately jumped out at me was how poorly the `task`
> variable is being managed. So I was poking around trying to see if there was
> a way to get a reference to the generator instance from within the generator
> itself so I could pass it around, such as:
>
> ```
> function *init() {
> var contents = yield readConfigFile(this);
> doSomethingWith(contents);
> console.log("Done");
> }
> ```
>
> Of course, `this` isn't a reference to the generator itself, but rather the
> this-binding for the function. It struck me, though, that my example could be
> a lot cleaner if I could get a reference to the generator from the generator
> function and pass that around rather than having to manage that reference
> outside.
>
> Now to my question: is there a way to get a reference to the generator from
> inside the generator function?
>
> (Also, sorry if I'm getting the nomenclature wrong, still trying to wrap my
> head around the relationship between generators, iterators, and functions.)
--
Dr. Axel Rauschmayer
a...@rauschma.de
rauschma.de
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