On Wednesday, October 17, 2012 at 10:53 PM, Axel Rauschmayer wrote: > Addendum: For example, you won’t be able to reliably use Object.assign() to > mix an object with methods into a prototype object, because those methods > might be non-enumerable. >
This not a silver bullet by any means. If you define that object and all of those methods haven't been explicitly set to enumerable:false, then they will all copy Rick > > I think I initially misunderstood you. You think that what I’ve mentioned > above is a feature, I’d argue that it is a bug. > > On Oct 18, 2012, at 4:47 , Axel Rauschmayer <[email protected] > (mailto:[email protected])> wrote: > > > > On Wednesday, October 17, 2012 at 10:27 PM, Axel Rauschmayer wrote: > > > > > I’m a bit skeptical about excluding non-enumerable properties for > > > > > Object.assign(). I still find enumerability a hard concept to wrap my > > > > > mind around, because it pops up in unexpected places. At the moment, > > > > > it mostly matters for for...in and > > > > > Object.keys()/Object.getOwnPropertyNames(). Does it really make sense > > > > > to increase its role in JavaScript? > > > > > > > > > > > > > > > > > > > > > > > It's a matter of paving the cow path of least surprise. Imagine if you > > > tried to copy the properties and values of a plain object to an object > > > with a null prototype and all of those properties you explicitly didn't > > > want were now present. > > But those won’t be copied, because only own properties will be copied. I’d > > be more worried about adding non-enumerable own properties to an object and > > those *not* being copied. > > > > -- > > Dr. Axel Rauschmayer > > [email protected] (mailto:[email protected]) > > > > home: rauschma.de (http://rauschma.de/)twitter: twitter.com/rauschma > > (http://twitter.com/rauschma) > > blog: 2ality.com (http://2ality.com/) > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > es-discuss mailing list > > [email protected] (mailto:[email protected]) > > https://mail.mozilla.org/listinfo/es-discuss > > -- > Dr. Axel Rauschmayer > [email protected] (mailto:[email protected]) > > home: rauschma.de (http://rauschma.de)twitter: twitter.com/rauschma > (http://twitter.com/rauschma) > blog: 2ality.com (http://2ality.com) > > > > > > > > > > > > > > > > > >
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