Re: [Flashcoders] Duplicating an object without pointing to original one
I use this function (think I got it from Darron Schall's blog) to do a deep
copy. I had the same experience as Jesse with mx.utils.ObjectCopy not
working correctly...
// --
// copy an object
function copyObject(obj) {
// create a "new" object or array depending on the type of obj
var copy = (obj instanceof Array) ? [] : {};
// loop over all of the value in the object or the array to copy them
for(var i in obj) {
// assign a temporarity value for the data inside the object
var item = obj[i];
// check to see if the data is complex or primitive
switch(item instanceof Array || item instanceof Object) {
case true:
// if the data inside of the complex type is still complex,
we need to
// break that down further, so call copyObject again on that
complex
// item
copy[i] = copyObject(item);
break;
default:
// the data inside is primitive, so just copy it (this is a
value copy)
copy[i] = item;
}
}
return copy;
}
best, - rajat
On 1/10/06, zwetan <[EMAIL PROTECTED]> wrote:
>
>
> Hi,
>
> >
> > How do you duplicate an object {bool:true, val:5} in another variable
> > without pointing to the original one, and without having to create a
> > constructor. In Director, there's a duplicate() method in Lingo. Is
> > there an equivalent way to do this in Flash?
> >
> > Something like this, but which would actually work:
> >
> > var h = {a:true};
> > var g = h;
> > trace(h.a); // true
> > g.a = false;
> > trace(h.a); // false, but want to be true, so it's separate from g
> > object.
> >
>
> I recently released a library which add this functionality
> of deep copy to all core objects
>
> You can download it here
> http://www.burrrn.com/projects/core2.html
>
>
> your small exemple will turn like that:
>
> var h = { a:true };
> var g = h.copy();
> trace( h.a ); //true
> g.a = false;
> trace( h.a ); //true
>
>
>
> zwetan
>
>
>
>
>
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--
Rajat Paharia
[EMAIL PROTECTED]
http://www.bunchball.com
http://www.rootburn.com
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RE: [Flashcoders] Duplicating an object without pointing to original one
Hi,
>
> How do you duplicate an object {bool:true, val:5} in another variable
> without pointing to the original one, and without having to create a
> constructor. In Director, there's a duplicate() method in Lingo. Is
> there an equivalent way to do this in Flash?
>
> Something like this, but which would actually work:
>
> var h = {a:true};
> var g = h;
> trace(h.a); // true
> g.a = false;
> trace(h.a); // false, but want to be true, so it's separate from g
> object.
>
I recently released a library which add this functionality
of deep copy to all core objects
You can download it here
http://www.burrrn.com/projects/core2.html
your small exemple will turn like that:
var h = { a:true };
var g = h.copy();
trace( h.a ); //true
g.a = false;
trace( h.a ); //true
zwetan
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Re: [Flashcoders] Duplicating an object without pointing to original one
If you download the FlashRemoting source code, (
http://download.macromedia.com/pub/flashremoting/mx2004/components/actionscript_2.0/flashremoting_comp_sourcecode.zip
), you will have a new class mx.utils.ObjectCopy ... this will make a
new object, instead of a reference to the first.
On 1/9/06, JesterXL <[EMAIL PROTECTED]> wrote:
> For shallow copies, you can use a for in loop.
>
> var o:Object = {label: "test", data: 5};
> var copy:Object = {};
> for(var p in o)
> {
> copy[p] = o[p];
> }
>
> However, if the o has properties that are objects, or arrays, you'll have
> problems because your copy will still contain references. You need to
> utilize a recursive algorithm to continually dig down on the object.
> Recursion in Flash, however, is dangerous since you have a limit of 256, and
> adjusting this in Flex only further increases the danger of locking up the
> comp.
>
> My suggestion is to provide a clone (or duplicate) method to those data
> objects you use to copy, and leave the implementation details to that object
> rather than creating a catch-all method.
>
> Example:
>
> class MyObject
> {
> public var label:String;
> public var data:Number;
>
> public function clone():MyObject
> {
> var o:MyObject = new MyObject();
> o.label = label;
> o.data = data;
> return o;
> }
> }
>
> - Original Message -
> From: "Mendelsohn, Michael" <[EMAIL PROTECTED]>
> To: "Flashcoders mailing list"
> Sent: Monday, January 09, 2006 12:05 PM
> Subject: [Flashcoders] Duplicating an object without pointing to original
> one
>
>
> Hi list...
>
> How do you duplicate an object {bool:true, val:5} in another variable
> without pointing to the original one, and without having to create a
> constructor. In Director, there's a duplicate() method in Lingo. Is
> there an equivalent way to do this in Flash?
>
> Something like this, but which would actually work:
>
> var h = {a:true};
> var g = h;
> trace(h.a); // true
> g.a = false;
> trace(h.a); // false, but want to be true, so it's separate from g
> object.
>
> - MM
>
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> Flashcoders mailing list
> Flashcoders@chattyfig.figleaf.com
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>
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Re: [Flashcoders] Duplicating an object without pointing to original one
For shallow copies, you can use a for in loop.
var o:Object = {label: "test", data: 5};
var copy:Object = {};
for(var p in o)
{
copy[p] = o[p];
}
However, if the o has properties that are objects, or arrays, you'll have
problems because your copy will still contain references. You need to
utilize a recursive algorithm to continually dig down on the object.
Recursion in Flash, however, is dangerous since you have a limit of 256, and
adjusting this in Flex only further increases the danger of locking up the
comp.
My suggestion is to provide a clone (or duplicate) method to those data
objects you use to copy, and leave the implementation details to that object
rather than creating a catch-all method.
Example:
class MyObject
{
public var label:String;
public var data:Number;
public function clone():MyObject
{
var o:MyObject = new MyObject();
o.label = label;
o.data = data;
return o;
}
}
- Original Message -
From: "Mendelsohn, Michael" <[EMAIL PROTECTED]>
To: "Flashcoders mailing list"
Sent: Monday, January 09, 2006 12:05 PM
Subject: [Flashcoders] Duplicating an object without pointing to original
one
Hi list...
How do you duplicate an object {bool:true, val:5} in another variable
without pointing to the original one, and without having to create a
constructor. In Director, there's a duplicate() method in Lingo. Is
there an equivalent way to do this in Flash?
Something like this, but which would actually work:
var h = {a:true};
var g = h;
trace(h.a); // true
g.a = false;
trace(h.a); // false, but want to be true, so it's separate from g
object.
- MM
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[Flashcoders] Duplicating an object without pointing to original one
Hi list...
How do you duplicate an object {bool:true, val:5} in another variable
without pointing to the original one, and without having to create a
constructor. In Director, there's a duplicate() method in Lingo. Is
there an equivalent way to do this in Flash?
Something like this, but which would actually work:
var h = {a:true};
var g = h;
trace(h.a); // true
g.a = false;
trace(h.a); // false, but want to be true, so it's separate from g
object.
- MM
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