The closest to an answer I can find, a reply by Brian Goetz on lambda-dev: Don't know the answer to any of these yet! But watch the repo as the story plays out.
On Jul 27, 2012, at 1:15 AM, François Sarradin wrote: > Hi, > > I have seen in one of the changesets that an Optional type is supposed > to be available in Java 8. I have some questions about: > > * will the current implementation change later? > * is it suppose to support a kind of flatMap operation? > * will it be considered as an Iterable? On Tue, Oct 23, 2012 at 9:22 PM, clay <[email protected]> wrote: > Has anyone seen java.util.Optional in the new Lambda builds? > > Why is there no flatMap? > > Why does it not support iteration (can't do a for loop over an Optional)? > > Why doesn't it have Some/None subclasses? > > Why does Scala and Functional Java get this right yet Guava and now the core > Java guys completely ruin it? > > Why doesn't Java 8 have persistent immutable collections? > > > Some of the JDK developers have real talent, but this is completely amateur. > > I really hope they can fix this before it is set in stone. Tons of decent > functional programmers can write a complete Option implementation easily as > a fun exercise. It boggles my mind that they don't have the decent talent > working on something so important. > > -- > You received this message because you are subscribed to the Google Groups > "Java Posse" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/javaposse/-/9H396Nyijw4J. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. -- You received this message because you are subscribed to the Google Groups "Java Posse" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en.
