On Dec 19, 2010, at 2:51 AM, Garrett Smith wrote:
> On 12/19/10, fernando trasvina <trasv...@gmail.com> wrote:
>>
>> On Dec 19, 2010, at 2:17 AM, Garrett Smith wrote:
>>
>>> On 12/18/10, Juriy Zaytsev <kan...@gmail.com> wrote:
>>>> On Sun, Dec 19, 2010 at 2:02 AM, Garrett Smith
>>>> <dhtmlkitc...@gmail.com>wrote:
>>>>
>>>>> On 12/18/10, Ezequiel <ezequ...@ziggyism.com> wrote:
>>>>>> On Dec 17, 2:37 am, Juriy Zaytsev <kan...@gmail.com> wrote:
>>>>>>> var beget = (function() {
>>>>>>> function F(){ };
>>>>>>> return function(o) {
>>>>>>> F.prototype = o;
>>>>>>> return new F;
>>>>>>> };
>>>>>>>
>>>>>>> })();
>>>>>>>
>>>>>>
>>>>>>> return new F;
>>>>>>
>>>>>> Are there any penalties for not including the parentheses when you're
>>>>>> invoking a constructor?
>>>>>>
>>>>>> ie. new F; versus new F();
>>>>>>
>>>>>
>>>>> It is the `new` operator, not `Arguments`, that makes it a New
>>>>> Expression.
>>>>>
>>>>> More is explained here (thread tip: ignore troll response):
>>>>> <
>>>>> https://groups.google.com/group/comp.lang.javascript/browse_thread/thread/6bb13a70aa769e17/ce53a37da77d354b#ce53a37da77d354b
>>>>>>
>>>>
>>>>
>>>> | Parenthesis is either `Arguments` or as Grouping Operator, depending on
>>>> | the context in which it appears. When parenthesis appear to the right
>>>> of
>>>> | a MemeberExpression, then a CallExpression is formed. [...]
>>>>
>>>> ..or to the right of another CallExpression:
>>>
>>> Ah, that's right.
>>
>> parenthesis are for function calling not for arguments, arguments object is
>> created either you passed arguments or no.
>
> We are discussion the ECMAScript grammar productions known as
> `Arguments`, `NewExpression`, `MemberExpression`, and
> `CallExpression`. Did you follow the c.l.js thread URL I posted in my
> message? Did you see kangax message about those?
>
> Please also see the ECMA-262 specification. Ed 3 section on LHS
> expressions linked here for convenience:
> <http://bclary.com/2004/11/07/#a-11.2>
>
>> the new operator is the one that triggers the object creation process, but
>> for consistency i would recommend to put the parenthesis, because in the end
>> the function will get called.
>
> The new operator is what makes the NewExpression; right. It is
> `Arguments` that is optional. What you are calling the "parenthesis"
> is formally known as `Arguments`.
>
> You seem to be referring to the sore spot known as the `arguments`
> object, available in the function call. Am I right? An `arguments`
> object is required to be created, though that is optimized in certain
> situations by certain implementations (if a tree falls in the woods,
> does it make a sound?). And there are a few c.l.js threads where we
> discussed implementations that optimize away of the creation of
> `arguments` object.
>
> But anyway, the `arguments` object and the grammar production known as
> `Arguments` are two totally different things. We're discussing the
> latter here.
> --
> Garrett
The things you are referring to are known as expressions. such as
Arguments : ()
( ArgumentList )
Apendix 3 on ES standar
>
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