[jira] [Updated] (GROOVY-11586) Provide an injectAll DGM method

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

     [ https://issues.apache.org/jira/browse/GROOVY-11586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King updated GROOVY-11586:
-------------------------------
    Issue Type: New Feature  (was: Improvement)

> Provide an injectAll DGM method
> -------------------------------
>
>                 Key: GROOVY-11586
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11586
>             Project: Groovy
>          Issue Type: New Feature
>            Reporter: Paul King
>            Assignee: Paul King
>            Priority: Major
>             Fix For: 5.0.0-beta-1
>
>
> Streams have both reduce and scan (in gatherers as part of JDK 24). Groovy has inject for reduce but no equivalent for scan. The intention is to provide injectAll to provide this:
> {code:groovy}
> assert (1..3).injectAll(''){ carry, next -> carry + next } == ['1', '12', '123']
> var runningAvg = [1.0, 2.0, 3.0].injectAll([0.0, 0, null]){ accum, next ->
>     var total = accum[0] + next
>     var count = accum[1] + 1
>     [total, count, total/count]
> }
> assert runningAvg*.get(2) == [1.0, 1.5, 2.0]
> assert [a:1, b:2, c:3].injectAll('') { carry, k, v ->
>     carry + k * v
> } == ['a', 'abb', 'abbccc']
> {code}



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