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https://issues.apache.org/jira/browse/LANG-1177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947139#comment-16947139
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Gary D. Gregory commented on LANG-1177:
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Feel free to provide a PR on GitHub :)
> Improve indexOf performance when called multiple times
> ------------------------------------------------------
>
> Key: LANG-1177
> URL: https://issues.apache.org/jira/browse/LANG-1177
> Project: Commons Lang
> Issue Type: Improvement
> Reporter: Sebb
> Priority: Major
>
> The indexOf methods search for a single entry in an array.
> This works fine when only the first matching entry is needed, however it is
> not so efficient when all matches are needed (because of the setup/teardown
> overheads).
> It might be useful to introduce an indexesOf method that returns a BitSet
> containing all the matches.
> This can then be used in the removeAllOccurrences methods.
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