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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