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I have a lot of display objects in an array that I'm constantly adding and removing from stage. When removed they are not used anymore.

Considering the displayObject is not on the display list, and has no event listeners... will it be garbage collected if I use splice to remove it from the array?

Is it safer if I null the object first?

myArray[2] = null;
myArray.splice(2,1);
Mattias
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Pier
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2 Answers2

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As long as there are no remaining references to the DisplayObject then yes, removing it from the array using splice, or even just setting it to null will allow it to become a candidate for garbage collection.

Update: Setting the item to null before removal from the array is redundant and will make no difference.

Peter
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If you need better performance I suggest you using pools instead of creating lots of objects and putting them in array. Use some linked list implementation instead of splice() operation, which is really slow.

ncreated
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  • Thanks for the idea. The performance is ok, I'm only worried because this flash will run for hours in a museum without restarting. – Pier Oct 10 '11 at 09:42
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    So I advice you to use some profiler to see if you have no memory leaks (whether your memory usage is on the same level all the time). You can easy check how much memory your swf uses. There's a lot of open source profilers which draw memory usage graphs. – ncreated Oct 10 '11 at 13:26