Nice
On Saturday, August 30, 2014 5:09:46 PM UTC-4, Dean Landolt wrote:
>
> I was trying to find a clean way to adapt co to be able to be able to
> yield promise or non-promise values (e.g. use yield like the `when` method
> of a lot of promise libs), so I started hacking out features. By the time I
> was through I was pretty surprised to see that it essentially boiled down
> to this little block of code (assuming es6 promises):
>
> function run(coroutine) {
> return new Promise(function (resolve, reject) {
> (function next(value, exception) {
> var result;
> try {
> result = exception ? coroutine.throw(value) : coroutine.next(value);
> }
> catch (error) {
> return reject(error);
> }
> if (result.done) return resolve(result.value);
> Promise.resolve(result.value).then(next, function(error) {
> next(error, true);
> });
> })();
> });
> }
>
> This allows you to yield any promise or non-promise value, and returns a
> promise representing the result. You can also use `yield*` to delegate to
> other coroutines correctly.
>
> If anyone's interested I wrapped this up and published it to npm as the
> `copromise` module. Enjoy!
>
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