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https://issues.apache.org/jira/browse/FLEX-21541?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Mclean resolved FLEX-21541.
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Resolution: Not A Problem
RangeError should be throws as per the documentation.
> ArrayCollection setItemAt throws RangeError
> -------------------------------------------
>
> Key: FLEX-21541
> URL: https://issues.apache.org/jira/browse/FLEX-21541
> Project: Apache Flex
> Issue Type: Bug
> Components: .Unspecified - Framework
> Affects Versions: Adobe Flex SDK Previous
> Environment: Affected OS(s): All OS Platforms
> Affected OS(s): All OS Platforms
> Language Found: English
> Reporter: Adobe JIRA
>
> Steps to reproduce:
> var a:ArrayCollection = new ArrayCollection();
> a.setItemAt("test",0);
> Actual Results:
> RangeError is thrown
>
> Expected Results:
> the item at index 0 is inserted into the ArrayCollection, to behave like the
> [] operator on Arrays. In the docs there is also no notation of the RangeError
>
> Workaround (if any):
> make sure the source array of the ArrayCollection is big enough
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