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    <p>As Tom says, this is because AS3 passes by reference. If you don't want to modify the original values then you should, again as Tom says, create copies of them.</p> <p>Fortunately, AS3 has a utility to do this -- <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/utils/ObjectUtil.html#copy%28%29" rel="nofollow">ObjectUtils.copy</a>. Try this code instead of your original:</p> <pre><code>public function create():ArrayCollection{ var index:int = 0; var data:ArrayCollection = new ArrayCollection(); var length:int = originalData.length; for(index; index &lt; length; index++){ data.addItem(mx.utils.ObjectUtil.copy(originalData[index])); } return data; } </code></pre> <p>Do take note that copy() returns a generic Object. If you want to access any of its properties in a type-safe manner you'll have to cast it to its type.</p> <p>A bit more about the pass-by-reference deal. Let's say we have items a, b, and c floating around in memory. You put them into an array(originalData). originalData now contains <em>references</em> to a, b, and c. You then create an ArrayCollection and insert (again) references to a, b, c. Objects a, b, and c aren't what's being stored in either the array or the ArrayCollection. So when you update originalData[0] you're getting a reference to an object (a), and updating it.</p> <p>Likewise when you update ArrayCollection.getItemAt(0) you're getting the same reference and updating the underlying object which is why you're getting the behavior you're getting. Making a copy and inserting it means you're referencing an entirely new object.</p>
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    1. POHow can I copy an ArrayCollection of transfer objects in actionscript?
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    1. COBy casting you refer to this? ObjectUtil.copy(originalData[index]) as MyItem
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      1. USKarl Goblecoque
    2. COYes, that's what I mean.
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    3. COHey sean, could you review my code in the latest edit, in my question.
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