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https://issues.apache.org/jira/browse/GROOVY-10879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-10879.
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> Potential additional DGM collectEntries variants
> ------------------------------------------------
>
> Key: GROOVY-10879
> URL: https://issues.apache.org/jira/browse/GROOVY-10879
> Project: Groovy
> Issue Type: Improvement
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Fix For: 5.0.0-alpha-1
>
>
> As discussed in the mailing list:
> https://lists.apache.org/thread/7rd6wdblnh7bmdf6socjnbf21crg37g0
> Existing variants:
> {code}
> var languages = ['Kotlin', 'Groovy', 'Java', 'Clojure']
> assert languages.collectEntries{ [it.toLowerCase(), it.size()] } ==
> [kotlin:6, groovy:6, java:4, clojure:7]
> assert languages.collectEntries{ [it.toLowerCase(), it] } ==
> [kotlin:'Kotlin', groovy:'Groovy', java:'Java', clojure:'Clojure']
> assert languages.collectEntries(Scala:5){ [it, it.size()] } ==
> [Scala:5, Kotlin:6, Groovy:6, Java:4, Clojure:7]
> {code}
> Proposed new variants:
> {code}
> assert languages.collectEntries(String::toLowerCase, String::size) ==
> [kotlin:6, groovy:6, java:4, clojure:7]
> assert languages.withCollectedKeys(String::toLowerCase) == [kotlin:'Kotlin',
> groovy:'Groovy', java:'Java', clojure:'Clojure']
> assert languages.withCollectedValues([Scala:5], String::size) == [Scala:5,
> Kotlin:6, Groovy:6, Java:4, Clojure:7]
> def squared = e -> e ** 2
> assert [Scala:5, Kotlin:6, Groovy:6, Java:4,
> Clojure:7].collectEntries(String::toLowerCase, squared) ==
> [scala:25, kotlin:36, groovy:36, java:16, clojure:49]
> {code}
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