On Mon, Mar 19, 2012 at 3:56 AM, Narvius <narv...@gmail.com> wrote: > I see several ways to achieve what I want, that is to return both the new > world state and success status. > 1) Compare the old and new value - doesn't seem very efficient. >
Probably not as inefficient as you think. Identical things are recognized as equal right away, unequal things are almost certain to have different hash values and be recognized as unequal immediately. Only slow path are large equal structures that were created by separate processes and therefore aren't identical. > 2) Return [new-state success?] instead of just new-state - requires too > much acrobatics from the user of the function (which is still me, but > whatever). > Probably it's more Clojuresque to return new-state or nil, and handle both cases anywhere you call the function. Whether you choose to return [new-state success?] or new-state or nil, monads could help you with the acrobatics. That's exactly the kind of thing they are good for. Options 3 and 4 seem like things you should avoid if you can make 1 or 2 work. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
