Remove filtered out elements from ArrayCollection in ActionScript3

Question

I have a big ArrayCollection variable. I want to filter it several times and each time assign the filtered result to a different ArrayCollection variable.

So if it has let's say people, fruits and cars. (for illustration purposes) I want to first filter it to only show people, assign the result to a people ArrayCollection, then filter it to show fruits and assign it to a fruits ArrayCollection and so on.

How can I do that? Not the filtering, but the assignment after filtering. Or is it faster to instead run a for-loop through the big ArrayCollection and just add each item into the corresponding smaller ArrayCollection?

Constantiner · Accepted Answer · 2011-09-04 18:34:13Z

2

You can use mx.collections.ListCollectionView for that. Say you have the following original ArrayCollection:

var myCollection:ArrayCollection;

Now people:

var peopleList:ListCollectionView = new ListCollectionView(myCollection);
peopleList.filterFuntion = peopleFilterFuntion;
peopleList.refresh();

The same for fruits:

var fruitsList:ListCollectionView = new ListCollectionView(myCollection);
fruitsList.filterFuntion = fruitsFilterFuntion;
fruitsList.refresh();

And cars:

var carsList:ListCollectionView = new ListCollectionView(myCollection);
carsList.filterFuntion = carsFilterFuntion;
carsList.refresh();

answered Sep 4, 2011 at 18:34

Constantiner

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2 Comments

Francisc Over a year ago

Aren't the filtered out variables kept in memory for when the filterFunction is set to null?

Constantiner Over a year ago

As far as I know, ListCollectionView doesn't create new underlying collection but uses the original ArrayCollection. So it doesn't occupy extra memory for elements.

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