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https://issues.apache.org/jira/browse/GROOVY-9848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17734193#comment-17734193
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Eric Milles commented on GROOVY-9848:
-------------------------------------
The more interesting usage I found was {{grep}}:
{code:groovy}
def fruitList = ['apple', 'apple', 'pear', 'orange', 'pear', 'lemon', 'banana']
def predicate = [apple:true, banana:true, lemon:false, orange:false, pear:true]
def nonCitrus = fruitList.grep(predicate) //
['apple','apple','pear','pear','banana']
{code}
> Allow membership operator to work on maps
> -----------------------------------------
>
> Key: GROOVY-9848
> URL: https://issues.apache.org/jira/browse/GROOVY-9848
> Project: Groovy
> Issue Type: Improvement
> Reporter: Keegan Witt
> Assignee: Eric Milles
> Priority: Major
>
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