Also true ... it's funny 'cause for ages we, developers, tried to make "ES3 classes" non enumerable so that for/in were not affected, we could extend (avoiding conflicts, etc) and now that we could define such behavior as default through a new ES6 class syntax we are "worried" that is not what developers want ... I thought the fact basically every piece of code based on `.hasOwnProperty()` check as first line of any `for/in` would be already convincing nobody wants class enumerability and indeed I usually define prototypes via defineProperties in a non enumerable way, but maybe I am the only that never wanted/needed inherited enumerability for classes.
That being said the single/multiple mixin through prototype would be a problem, if done pragmatically, but it can be easily solved with `getOwnPropertyNames` ? Make classes methods/properties enumerable by default ... I am still not convinced is useful and I don't remember other OOP languages exposing classes properties within loops. Anyway, not a big deal, nothing to go nuts about ... we can all keep coding anyway. Best Regards On Mon, Jan 13, 2014 at 7:53 AM, Allen Wirfs-Brock <[email protected]>wrote: > > On Jan 13, 2014, at 6:46 AM, Boris Zbarsky wrote: > > > On 1/12/14 11:57 PM, Andrea Giammarchi wrote: > >> Recap: it seems we agree classes properties and methods should not show > >> up in a for/in > > > > I should note that web developers commonly expect DOM methods/properties > to show up in for/in (and in fact often write code depending on that, > sometimes depending on the order of the enumeration). So to the extent > that we're trying to align DOM stuff with ES6 classes, we may need a > class-level switch to decide whether a particular class has enumerable > members or something. :( > > Whatever the default enumerability, you can always change it using > Object.defineProperty and you can write a utility function that will does. > Define the utility as a method on function prototype and you can say > something like: > > class Foo {}; > Foo.enumerableMethods(); > //or > Foo.nonenumerableMethods(); > > Allen > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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