One use case is for coroutine runners which accept either generators or generator functions:
https://github.com/deanlandolt/copromise/blob/master/copromise.js#L34-L36 Is there a better way to accomplish this? On Tue, Mar 3, 2015 at 12:12 PM, Erik Arvidsson <[email protected]> wrote: > Why do you want to do this? > > It is an antipattern that we have covered before. > > On Tue, Mar 3, 2015 at 5:41 PM Guilherme Souza <[email protected]> wrote: > >> Hi all, >> >> I was wondering how one could check if a given function is a generator >> function, is a cross-realm way: >> >> ``` >> let f = function(){} >> let g = function*(){} >> >> typeof f === typeof g // 'function' >> >> f instanceof Function // true, but only in the same Realm >> g instanceof Function // true, but again only in the same Realm >> >> let GeneratorFunction = Object.getPrototypeOf(function*(){}).constructor >> f instanceof GeneratorFunction // false >> g instanceof GeneratorFunction // true, but only in the same Realm >> >> // This works, but relies on Function.prototype being a function itself. >> typeof Object.getPrototypeOf(f) // 'function' >> typeof Object.getPrototypeOf(g) // 'object' >> ``` >> >> So what is the recommended way to do this type of check? >> Would something like `Array.isArray` for generator functions be helpful? >> >> Regards, >> Gui >> >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
