Is there a way to extract a subset of an array collection where a particular
value is found, without doing it manually

EG {
{t=4,s=3}
{ t=3,s=3}
{ t=3,s=3}
}

Extract where t = 3

returns

{
{ t=3,s=3}
{ t=3,s=3}
}

Hi,

I don't think there is a non-manual way to do it. If it was the entire object, you could use .contains(obj)

"nikos101" <webforumsuser@macromedia.com> wrote in message
news:g95kq6$31b$1@forums.macromedia.com...
> Is there a way to extract a subset of an array collection where a
> particular
> value is found, without doing it manually
>
> EG {
> {t=4,s=3}
> { t=3,s=3}
> { t=3,s=3}
> }
>
> Extract where t = 3
>
> returns
>
> {
> { t=3,s=3}
> { t=3,s=3}
> }

filterFunction

Well, if you set a filterFunction, you'd need to iterate through the
ArrayCollection to get the filtered version. Each iteration will cause an
execute to filterFunction.

You're better off manually iterating through the array.

Though, if you want the filtering to happen when you have a view attached to
your ArrayCollection like a datagrid or a list, then a filterFunction is the
best solution.

"anirudhs" <webforumsuser@macromedia.com> wrote in message
news:g96b39$qtu$1@forums.macromedia.com...
> Well, if you set a filterFunction, you'd need to iterate through the
> ArrayCollection to get the filtered version. Each iteration will cause an
> execute to filterFunction.

No, you just call yourAC.refresh() after applying the filter. Then any
references to yourAC will only show the filtered data.

HTH;

Amy

Exactly. yourAC.refresh() is what calls the filterFunction for each element in
the array:

This is from mx.collections.ListCollectionView:

if (filterFunction != null)
{
var tmp:Array = [];
var len:int = localIndex.length;
for (var i:int = 0; i < len; i++)
{
var item:Object = localIndex[i];
if (filterFunction(item))
{
tmp.push(item);
}
}
localIndex = tmp;
}

This is the code that gets executed when you set a filterFunction and call
refresh. This "iteration" is what I was referring to in my previous post. Sorry
if it wasn't very clear.

You generally do not want to do so much if all you want is a subset from the
array collection without the arraycollection being mapped to a view or
something.

HTH,
Anirudh Sasikumar