Eric Milles created GROOVY-10616:
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Summary: Add peek extension method for Optional, OptionalInt,
OptionalLong and OptionalDouble
Key: GROOVY-10616
URL: https://issues.apache.org/jira/browse/GROOVY-10616
Project: Groovy
Issue Type: Improvement
Components: groovy-jdk
Reporter: Eric Milles
Assignee: Eric Milles
{{java.util.Optional}}, et al. do not offer a direct method for consuming the
value if present but returning the optional unchanged. A "peek" method similar
to {{Stream#peek(Consumer<? super T>)}} would allow this without having to
resort to using filter and always returning true or map and always returning
the value.
Proposed extension methods:
{code:java}
<T> Optional<T> peek(Optional<T> self, Consumer<? super T> consumer)
OptionalInt peek(OptionalInt self, IntConsumer consumer)
OptionalLong peek(OptionalLong self, LongConsumer consumer)
OptionalDouble peek(OptionalDouble self, DoubleConsumer consumer)
{code}
Example usage:
{code:groovy}
def test(Optional<?> opt) {
opt.peek { print it } // only prints if value present
}
{code}
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