On Thu, Oct 18, 2012 at 10:13 AM, Rick Waldron <waldron.r...@gmail.com>wrote:
> > > On Thu, Oct 18, 2012 at 12:59 AM, Dmitry Soshnikov < > dmitry.soshni...@gmail.com> wrote: > >> >> On Oct 17, 2012, at 9:34 PM, Axel Rauschmayer wrote: >> >> Pardon, I missed and cannot find what is Object.assign(...), seems it's >> not from the latest draft. Is it just defining properties (via >> Object.defineProperty) on from a source to destination object? Like >> old-good Object.extend(...)? >> >> >> Explained here: >> https://github.com/rwldrn/tc39-notes/blob/master/es6/2012-09/sept-18.md >> >> >> I see, thanks. >> >> So, from what I see: >> >> 1. Source should not be the one. We should support many of sources to >> copy all them at once: >> >> Object.assign(dest, source1[, source2, ... sourceN]) >> > > > I had originally hoped for this, but we reached consensus > on Object.assign(dest, source) to allow for a possible descriptor map param. > > The pattern you're looking for can be achieved as.... > > [ defaults, options, overrides ].reduce(Object.assign, {}); > > > >> >> In addition: >> >> 2. If the last parameter is boolean, then it's created as >> includeNonEnumerable: >> >> Object.assign(desc, source1[, source2, ... sourceN, includeNonEnumerable); >> > > > Boolean parameters are a non-starter and would conflict with the desire to > have an optional third "default descriptor map" parameter. > In general, it makes sense to be careful about adding new parameters, because it prevents useful extensions in the future. > > > Rick > > >> >> Example; >> >> Object.assign({a: 10}, {b: 20}, Object.defineProperties({}, {c: {value: >> 30}}), true); // {a: 10, b: 20, c: 30} >> >> Dmitry >> > > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > > -- Yehuda Katz (ph) 718.877.1325
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