[jira] [Commented] (GROOVY-7479) Groovy should provide "inits" and "tails" DGM methods for lists

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-7479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605525#comment-14605525 ] 

ASF GitHub Bot commented on GROOVY-7479:
----------------------------------------

GitHub user paulk-asert opened a pull request:

    https://github.com/apache/incubator-groovy/pull/48

    GROOVY-7479: Groovy should provide "inits" and "tails" DGM methods fo…

    …r lists

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/paulk-asert/incubator-groovy groovy7479

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-groovy/pull/48.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #48
    
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commit ef8ebc001198059df57ec7e77128baca6511a7c7
Author: Paul King <pa...@asert.com.au>
Date:   2015-06-29T12:02:25Z

    GROOVY-7479: Groovy should provide "inits" and "tails" DGM methods for lists

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> Groovy should provide "inits" and "tails" DGM methods for lists
> ---------------------------------------------------------------
>
>                 Key: GROOVY-7479
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7479
>             Project: Groovy
>          Issue Type: Bug
>            Reporter: Paul King
>
> Similar behaviour to Scala:
> http://www.scala-lang.org/api/2.10.3/index.html#scala.collection.immutable.List
> The relevant bits:
> {{inits}}: Iterates over the init values of this list: the first value will be this list and the final one will be an empty list, with the intervening values the results of successive applications of init.
> {{tails}}: Iterates over the tail values of this list: the first value will be this list and the final one will be an empty list, with the intervening values the results of successive applications of tail.
> Rather than Scala's Iterable, I think just returning a list will be fine to match other methods like {{combinations}}. If efficiency is a concern we could return views (subList) from perhaps a copy of the incoming items.



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