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https://issues.apache.org/jira/browse/GROOVY-10863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17645861#comment-17645861
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Paul King commented on GROOVY-10863:
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If we were going to support the {{inject}} customisation then it could make
sense to use a {{Closure}} since we could pivot the {{collect}} vs {{inject}}
variations depending on whether the supplied {{Closure}} had one or two
parameters. Since I don't think that is still on the cards, using Java's
{{Function}} should be fine.
> Provide some additional Closure join variants
> ---------------------------------------------
>
> Key: GROOVY-10863
> URL: https://issues.apache.org/jira/browse/GROOVY-10863
> Project: Groovy
> Issue Type: Improvement
> Reporter: Paul King
> Priority: Major
>
> The idea (initiated on Slack) is to add in some join variants which take a
> Closure which does an additional transformation during join processing.
> Two possible implementations are:
> * the transform is essentially a "collect" on each element before traditional
> joining happens with some supplied delimiter - this is similar to what we do
> in other cases like the "sum" variant with a Closure and also what makeString
> in Eclipse Collections does
> * the transform embodies the whole join aspect, essentially becoming an
> inject and replacing the supplied delimiter
> We could support variants for both depending on whether the delimiter
> parameter was present.
> Other variations are whether start/end (or prefix/suffix) parameters would be
> supplied and potentially also direction (think foldl vs foldr).
> If we end up wanting to support all variations, we could provide a named
> parameter (map) version of the method.
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