Thanks (to you and to Andre).
Ivan
On Tuesday, February 15, 2011 10:12:06 AM UTC+1, Peter van der Zee wrote:
>
> On Tue, Feb 15, 2011 at 9:53 AM, Ivan S <ivan....@gmail.com> wrote:
>
>> Hi all.
>>
>> I don't know ECMA script specification so well, so if someone can explain
>> what's the difference between this two:
>>
>>
>> (function() {
>>
>> }());
>>
>>
>> (function() {
>>
>> })();
>>
>>
>> (brackets have different positioning)
>>
>>
>> Intuitively, I can understand the difference, but I would like technical
>> explanation.
>>
>
> The parenthesis are actually a "grouping operator" in js. In practice this
> means that you can change the order of precedence for operators using
> parens, `5+(7*9)` vs `(5+7)*8`. We do it all the time, most of the time
> without even thinking about it.
>
> Specification-wise, the grouping operator combined with the comma operator
> can have some minor effects, especially with eval and other edge cases. This
> is due to the (specification) internal notion of a Reference. I'm sure
> somebody will jump on this ship to explain that in detail if you're
> interested ;)
>
> As for the given example, there is absolutely no difference, a function is
> created first and executed right after doing so. There are no observable
> differences. Internally, the difference is whether the grouping operator
> returns a function or the result of calling that function.
>
> - peter
>
>
>
>>
>>
>> Thank you very much.
>>
>>
>>
>> Ivan
>>
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