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 <[email protected]> > 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 [email protected] rauschma.de
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