RFR 8080418 Add Optional.or()
scolebourne at joda.org
Fri Sep 25 13:06:54 UTC 2015
On 25 September 2015 at 11:58, Paul Sandoz <paul.sandoz at oracle.com> wrote:
> Please review this change to add a method Optional.or that allows one to better compose optionals:
New method seems fine.
> Separately while we are on the topic of Optional i would be interested in opinions on the following changes:
> 1) add methods that were missing on the primitive specializations; and
Seems fine, although I think a good case can be made for mapToObj() -
while going via a stream is possible, it is non-intuitive. I don't
think mapToInt() or mapToLong() are necessary on OptionalDouble (and
so on), but not being able to reach Object will be restrictive..
> 2) add to all variants a mapOrElseGet (otherwise known as a “fold”), which is the equivalent of map(mapper).orElseGet(supplier). That is arguably less mind-bending to use when transforming from Optional<T> to Optional<U>.
To me, this is pointless, and makes the API more confusing. Chaining
methods is a way of life in Java 8, and developers have to be able to
think that way.
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