And this script supposes to work everywhere. It allows to get the name
of any function from within the function itself.
<html>
<head>
<title>Functi on name</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">
<script type="text/javascript">
function test() {
var myName = getFunctionName (arguments.call ee);
alert(myName);
}
function getFunctionName (f) {
var tmp = f.toString();
var re = /(\s*function\s+ )(\w+)(\s*\()/m;
re.exec(tmp);
return RegExp.$2;
}
</script>
</head>
<body bgcolor="#FFFFF F" onload="test()" >
</body>
</html>
Jul 25 '05
34  2135 
> You're a PERL guy, right? Garbage collection in JS works just like PERL's.
I had to work a lot with Perl during The Bubble, but it was a "forced
marriage" (good contract = CGI = Perl).
Personally I think it was a language the least suited for Web. Just one
of the Bubble's twists: it was available, it was semi-working, it was
free and opps... it's a world wide standard.
The memory issues never bothered me there as I knew Perl only from its
CGI-script side. And on each shared server there was a "serial object
killer" launched by admin. After the assigned deadline it would simply
kill your context no matter was it in use or trach leftovers. So the
task was to do it as quick as possible and get out :-)
Whenever a variable's internal reference count reaches 0, it is
considered disposable and is disposed of.
The following lines do the exact same thing in JS as they do in PERL
(copy/paste them if you want):
$x = { };
$y = $x;
$x = { };
$y = { };
They differ only in that in JS { } is an object literal, and in PERL {
} is a hash literal, but that's immaterial to this discussion.
The thing created on line 1 is not garbage collected until line 4, and
it will ALWAYS be garbage collected at line 4. You can depend upon it.
There is no mystery to when an object is disposed of.
It is disposed of when the number of references to it reaches zero.
Plain and simple. No 'eventually' about it.
Period.
That's a great piece of info if you really sure about it!
Still I cannot understand why would anyone need two co-existing
references to the same object in the same namespace. For sport? To
check the garbage collector? JavaScript fully supports object
construction, extention and inheritance. If you really want to stay
within OP that would be plenty enough.
JRS: In article <11************ *********@g43g2 000cwa.googlegr oups.com>,
dated Wed, 27 Jul 2005 13:05:05, seen in news:comp.lang. javascript, VK
<sc**********@y ahoo.com> posted : Lines: 39 Being a regular reader of this group, you should have known that IE4 is
still in use.
As well as
.... irrelevant waffle. Everywhere means everywhere; you were wrong; your advice cannot be
relied upon.
Oh com'on... Read the linked topic.
The fact remains that you made a false statement, either by intention or
by carelessness. Your code did not work everywhere, not even in all
javascript browsers in current use.
--
© John Stockton, Surrey, UK. ??*@merlyn.demo n.co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demo n.co.uk/> - FAQish topics, acronyms, & links.
Check boilerplate spelling -- error is a public sign of incompetence.
Never fully trust an article from a poster who gives no full real name.
"VK" <sc**********@y ahoo.com> writes: engine (because you twisted its brains off). Good if it's some Object()
You know, it was only through a great deal of restraint that I prevented
myself from spraying my keyboard with soda after the "trashhold" thing,
then you have to go and write about twisting a GC's brains off! Now
look at the mess I have!
--
Jason Dufair - ja**@dufair.org http://www.dufair.org/
Crazy just thinkin' knowing that the world is round
And here I'm dancing on the ground
Never right side up or upside down
Is this real or am I dreaming?
-- Dave Matthews Band, "Crush"
Jason Dufair wrote: You know, it was only through a great deal of restraint that I prevented
myself from spraying my keyboard with soda after the "trashhold" thing,
then you have to go and write about twisting a GC's brains off! Now
look at the mess I have!
<FLUD>
It's just nothing. But if you see a thread here about *class* or *hash*
you better read it without a coffee in your hand or some unexpected and
painful physical damage is nearly guaranteed.
</FLUD>
VK wrote: You're a PERL guy, right? Garbage collection in JS works just like
PERL's.
I had to work a lot with Perl during The Bubble, but it was a "forced
marriage" (good contract = CGI = Perl).
Personally I think it was a language the least suited for Web. Just one
of the Bubble's twists: it was available, it was semi-working, it was
free and opps... it's a world wide standard.
No oops about it... if you need fast code, do C. If you need code fast,
do PERL.
The memory issues never bothered me there as I knew Perl only from its
CGI-script side.
In which memory issues can and often are far more prevalent.
And on each shared server there was a "serial object
killer" launched by admin. After the assigned deadline it would simply
kill your context no matter was it in use or trach leftovers. So the
task was to do it as quick as possible and get out :-)
Isn't it always?
Whenever a variable's internal reference count reaches 0, it is
considered disposable and is disposed of.
$x = { };
$y = $x;
$x = { };
$y = { };
The thing created on line 1 is not garbage collected until line 4, and
it will ALWAYS be garbage collected at line 4. You can depend upon it.
There is no mystery to when an object is disposed of.
It is disposed of when the number of references to it reaches zero.
Plain and simple. No 'eventually' about it.
Period.
That's a great piece of info if you really sure about it!
Technically it becomes "available for disposal". In practice the engine
might dispose of it in a few nano- or micro- seconds. By spec I believe
it is *allowed* to wait until it's damned good and ready, but the point
is that after the object's internal reference count reaches 0 it
becomes unreferrable and it *will* certainly be garbage-collected.
There are certainly ways to defeat this if you want to, but garbage
collection is fairly well-defined and dependable, and you can predict
what will be disposed of if you understand what you're coding.
*IF* you understand what you're doing.
Something we should all strive for, yes?
Still I cannot understand why would anyone need two co-existing
references to the same object in the same namespace. For sport? To
check the garbage collector? JavaScript fully supports object
construction, extention and inheritance. If you really want to stay
within OP that would be plenty enough.
For simplicity, efficiency, maintainability , readbility, and plain
elegance of code.
Consider this:
var c = 0,
things = [
new Thing(1),
new Thing(2),
// ...
new Thing(20)
];
/* the next statement creates a second reference to an existing object
* that already has a reference stored in the things[] array.
*/
while( thing = things[ ++c ] ) {
// figure out some x and y coords
thing.position( x, y );
thing.show();
}
Almost any time you need to perform multiple operations on an arbitrary
object independent of its name, it doesn't make sense but to store a
second reference to it.
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