[jira] [Commented] (GROOVY-9848) Allow membership operator to work on maps

[Eric Milles (Jira)]

    [ 
https://issues.apache.org/jira/browse/GROOVY-9848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17246632#comment-17246632
 ] 

Eric Milles commented on GROOVY-9848:
-------------------------------------

I am thinking that "in" may be wired this way to support maps with default 
value generation like this:
{code:groovy}
def map = [:].withDefault { 42 }
assert 'key' !in map.keySet()
​assert 'key' in map
assert ​​​​​​'key' in map.keySet()​
{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
>            Priority: Major
>




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