[jira] [Commented] (GROOVY-10473) Extend streams support to spread and subscript

["Eric Milles (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-10473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17489084#comment-17489084 ] 

Eric Milles commented on GROOVY-10473:
--------------------------------------

I also ran into the missing head/tail problem: https://stackoverflow.com/questions/19803058/java-8-stream-getting-head-and-tail

I went with:
{code:groovy}
stream.iterator().with {
  if (hasNext()) {
    def head = next()
    forEachRemaining(/* tail consumer */)
  }
}
{code}

Not sure if there is an opportunity to generalize this...

> Extend streams support to spread and subscript
> ----------------------------------------------
>
>                 Key: GROOVY-10473
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10473
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Eric Milles
>            Priority: Major
>
> Groovy 3 and 4 added some {{Stream}} extension methods like {{plus}}, {{toList}} and {{toArray}}.  And some default type conversions like {{String[] array = stream;}}.  This could be taken further by having spread-dot and subscript support:
> {code:groovy}
> stream*.thing // --> stream.map(it -> it.thing).toList()
> stream[1] // --> stream.skip(1).findFirst().orElse(null)
> stream[1..10] // --> stream.skip(1).limit(10-1).toList()
> // consider negative indexes and reverse ranges
> {code}
> Also, {{forEachPair}} and {{zip}} extension methods would be useful for processing parallel streams.



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