Lastest ES6 draft (rev 14) now available

Andrea Giammarchi andrea.giammarchi at gmail.com
Fri Mar 8 15:31:26 PST 2013


also .. how that happened that Array.from is basically the equivalent of

Array.from = Function.call.bind(Array.prototype.map); ?

Wasn't the initial reason to Array.from avoid the repeated all over
everywhere [].slice.call(arguments) where a signature slice-alike would be
more suitable so instead of Array.from(arguments).slice(1), as example, one
would Array.from(arguments, 1) ?

Thanks again :-)



On Fri, Mar 8, 2013 at 3:26 PM, Andrea Giammarchi <
andrea.giammarchi at gmail.com> wrote:

> am I understanding mixin correctly?
>
> 'mixin' in Object || (Object.mixin = function mixin(
>   target, source
> ) {
>   for(var
>     keys = Object.getOwnPropertyNames(source),
>     i = keys.length; i--; Object.defineProperty(
>       target,
>       keys[i],
>       Object.getOwnPropertyDescriptor(
>         source,
>         keys[i]
>       )
>     )
>   );
>   return target;
> });
>
> thanks
>
>
> On Fri, Mar 8, 2013 at 2:35 PM, Allen Wirfs-Brock <allen at wirfs-brock.com>wrote:
>
>> The March 8, 2013 Rev 14 draft is now available at the usual place:
>> http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts
>>
>> Changes include:
>>
>>    - Class bodies are now always string
>>     - *static* methods may now be defined in *ClassBody*
>>     - Updated comprehension syntax to use left-to-right order
>>     - Eliminated *is* and *isnt* operators
>>     - added grammar productions to allow unqualified super to be used
>>    after new operator
>>     - expression to the right of *of* in *for-of* now restricted to
>>    being *AssignmentExpression*
>>     - Almost all Chapter 15 constructors are now specified to have an
>>    @@create methid and are initialized in a manner that supports subclassing.
>>    (still need to work on Function)
>>     - Added Object.getOwnPropertyKeys function
>>     - Added Object.is function
>>     - Tentatively added Object.mixin function
>>     - Array.from now takes an optional map function
>>     - Added String.prototype.normalize method
>>     - All String.prototype methods that accept RegExp arguments will now
>>    work with subclasses of RegExp
>>     - Renamed Number.prototype.toInt to Number.prototype.toInteger
>>     - RegExp global, ignoreCase, multiline, source, sticky are now
>>    prototype accessor properties rather than instance own data properties.
>>    This is needed to support adding web compatible compile method.
>>     - Added new RegExp.prototype methods that allow string methods to
>>    work with RegExp subclasses: match, replace, search, split, @@isRegExp
>>     - Map and Set constructors now accept a =n optional comparator
>>    parameter. Only value currently allowed is “is”
>>     - ArrayBuffer and *Typed*Array object length no long restricted to 2
>>    32 limit
>>     - Eliminated all remaining references to [[Class]] and
>>    [[NativeBrand]] (except for in some DataView code that needs rewritting
>>    anyway)
>>     - Added SameValueZero abstraction operation that considers -0 and +0
>>    to be the same value.
>>     - Rename [[GetP]] to [[Get]] and [[SetP]] to [[Set]]
>>     - Specified that unless otherwise indicated, internal data
>>    properties are created when an object is allocated. Internal data
>>    properties are now explicitly listed in ObjectCreate abstract operation
>>    calls.
>>     - internally consolidated [[IsExtensible]]/[[IsSealed]/[[IsFrozen]]
>>    and [[PreventExtensions]]/[[Seal]]/[[Freeze]] into two MOP operations
>>    [[HasIntegrity]] and [[SetIntegrity]]. However, no public APIs (Proxy traps
>>    and Reflect functions) changed.
>>     - Numerous editorial and technical corrections, clarifications, and
>>    bug fixes
>>
>>
>>
>> _______________________________________________
>> es-discuss mailing list
>> es-discuss at mozilla.org
>> https://mail.mozilla.org/listinfo/es-discuss
>>
>>
>
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