[jira] [Updated] (GROOVY-11253) Identity variants for DGM#countBy

["Paul King (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-11253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King updated GROOVY-11253:
-------------------------------
    Description: 
We haven't added such functionality in the past since it was thought to be more of a niche use case than groupBy (where we do provide it). But given this is the closest Groovy has to creating a multiset/bag, it is probably worth having as a shortcut - rather than requiring an explicit Closure.IDENTITY.

Whether Groovy should have specialised multiset and multimap classes is another question for another issue. We could use ".toMultiset()" to return a more specialised multiset return type in that case, so we aren't making it harder with this PR to add such functionality later if we wanted.

> Identity variants for DGM#countBy
> ---------------------------------
>
>                 Key: GROOVY-11253
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11253
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Paul King
>            Priority: Major
>
> We haven't added such functionality in the past since it was thought to be more of a niche use case than groupBy (where we do provide it). But given this is the closest Groovy has to creating a multiset/bag, it is probably worth having as a shortcut - rather than requiring an explicit Closure.IDENTITY.
> Whether Groovy should have specialised multiset and multimap classes is another question for another issue. We could use ".toMultiset()" to return a more specialised multiset return type in that case, so we aren't making it harder with this PR to add such functionality later if we wanted.



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