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 >
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