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

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

     [ https://issues.apache.org/jira/browse/GROOVY-7479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King closed GROOVY-7479.
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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: New Feature
>          Components: groovy-jdk
>            Reporter: Paul King
>            Assignee: Paul King
>             Fix For: 2.5.0-alpha-1
>
>
> 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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