On Thu, Oct 18, 2012 at 12:59 AM, Dmitry Soshnikov < [email protected]> 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. Rick > > Example; > > Object.assign({a: 10}, {b: 20}, Object.defineProperties({}, {c: {value: > 30}}), true); // {a: 10, b: 20, c: 30} > > Dmitry >
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