On Wed, Oct 5, 2011 at 8:44 PM, Brendan Eich <bren...@mozilla.com> wrote:
> On Oct 5, 2011, at 8:21 PM, John J Barton wrote: > > I think what's missing is Object.extend: > > http://www.prototypejs.org/api/object/extend > http://api.jquery.com/jQuery.extend/ > http://dojotoolkit.org/reference-guide/dojo/extend.html > > http://docs.sencha.com/ext-js/4-0/source/Object2.html#Ext-Object-method-merge > > http://code.google.com/p/fbug/source/browse/branches/firebug1.9/content/firebug/lib/object.js > > just some examples in a few minutes. With extend, then we can write > > var bar = Object.extend(Object.create(aMethodList), aPropList); > > > I agree we should specify Object.extend in ES6. It's the API form of the .{ > "monocle-mustache" operator but generalized to non-literal RHS. > > However, IIRC PrototypeJS uses for-in and does not filter out enumerable > inherited properties. It also uses assignment. Neither is good for ES6. We > want only "own" properties, including private-name-object-keyed ones. This > is good motivation for a built-in. > PrototypeJS (and Firebug) pre-date Object.keys() and .hasOwnProperty(), so their implementation was just what could be done, not what was desired. Trait.create() parallels Object.create() and I gather that Trait.compose() resembles proposed Object.extend(). I wonder if the traits.js 'parallel-universe' could be applied to Trait.resolve(). In my experience resolve() isn't needed, but academic work on traits suggests otherwise, so it might be a good thing to investigate. jjb > > Given Object.extend, does .{ pay for itself outside of the class pattern > use-case? Does a play on dot connote the mutation of the LHS? I think "maybe > not" and "no". If we have only Object.extend, we still roll up a popular and > common de-facto standard. If we must have an operator, it should take > non-literal RHS and contain = in the assignment operator style. So, .= > (monocle-nostrils? monocle-thin-man-mustache? ugh). > > /be >
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