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https://issues.apache.org/jira/browse/GROOVY-2456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17467729#comment-17467729
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Eric Milles commented on GROOVY-2456:
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[~paulk]
"in" is somewhat of a useless operator for strings (aka {{CharSequence}}) since
it maps to "equals" not "contains". Is there still apetite for disconnecting
"in" from "isCase" for strings in Groovy 4 or later?
> Support in-Keyword for Strings
> ------------------------------
>
> Key: GROOVY-2456
> URL: https://issues.apache.org/jira/browse/GROOVY-2456
> Project: Groovy
> Issue Type: New Feature
> Components: groovy-jdk
> Affects Versions: 1.5.1
> Reporter: Bernd Schiffer
> Priority: Major
>
> assert 'abc'.contains('a') //1
> assert 'a' in ('abc'as List) //2
> assert 'a' in 'abc' //3 this breaks
> You ask a string if a substring is contained in it (//1). You can do that
> with the in-Keyword with Lists (//2), too. But you can't do this with the
> in-Keyword with Strings. It would be a consistent behaviour from Groovy if
> you could do //3.
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