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https://issues.apache.org/jira/browse/GROOVY-10223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423975#comment-17423975
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Eric Milles commented on GROOVY-10223:
--------------------------------------
{{Optional#ifPresent}} gives you the same support as Scala's
{{Option#forEach}}. If you want to get away from {{Optional}} there is
{{get()}}, {{orElse(T)}}, {{orElseGet(Supplier)}} or {{stream()}}.
Your any example could be expressed as {{optional.filter\{ it > 2 };}}.
Your process example could be expressed as {{optional.map\{ process(it)
}.ifPresent(processedList::add);}}.
Instead of the dual {{List#of}} example from the top, you could make use of the
{{toList(Stream)}} extension method to shorten inline list creation if you
didn't want to assign to a variable: {{optional.stream().toList()}}.
> Add support for Optional to DefaultTypeTransformation.asCollection()
> --------------------------------------------------------------------
>
> Key: GROOVY-10223
> URL: https://issues.apache.org/jira/browse/GROOVY-10223
> Project: Groovy
> Issue Type: New Feature
> Components: groovy-jdk
> Reporter: Stephen Smith
> Priority: Trivial
> Labels: features
>
> The JDK recently added support for *Optional::stream()* which returns a
> stream containing either the unwrapped value or an empty stream if the
> *Optional* is empty.
> In the groovy-jdk, using iteration however will call
> {noformat}
> DefaultTypeTransformation.asCollection(){noformat}
> which does not specifically check for type *Optional*, instead it will just
> wrap the *Optional* itself in a *List* rather than the unwrapped value as the
> default behavior.
> Adding an _if else_ clause will allow using the Optional as either a single
> or empty list.
> {code:java}
> if (value instanceOf Optional) {
> return ((Optional)value).map(List::of).orElse(List.of())
> }{code}
> Alternatively, add an *asList()* to the Optional class.
> (edit: 2021-09-13, missing bracket in code example)
>
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