Hi, (comp first filter) and some are not equivalent.
Consider this less simple case: user=> (defn negate-or-nil [x] (when (even? x) (- x))) #'user/negate-or-nil user=> (first (filter negate-or-nil [1 2 3])) 2 user=> (some negate-or-nil [1 2 3]) -2 user=> some returns the result of the predicate, filter returns the seq item for which predicate matches. Concerning the result of some, it seems better to return a more meaningful value, because it still can be used as logical true, e.g. in an if or when construct ... 2009/5/26 Sean Devlin <francoisdev...@gmail.com>: > > To add to my own post: > > There is also a discrepancy in what is returned from the two > > (some identity [1 2 3]) -> 1 > (every? identity [1 2 3]) -> true > > I would expect the following to occur > > (some identity [1 2 3]) -> true > > Granted, it's all the same to an if statement. However, current > behavior of some has the added use: > > (first (filter identity [1 2 3])) -> 1 > (some identity [1 2 3]) -> 1 > > Is the equivalence a fluke, or is this by design? Is there any > promise that some will continue to behave this way in the future? If > so, it seems like a bad alias for (first (filter...)) > > Just more to discuss > > On May 26, 9:02 am, Sean Devlin <francoisdev...@gmail.com> wrote: >> I just noticed a quirk in the core API. The some and every? functions >> have different naming conventions. Is there a reason for this? If >> not I think renaming/creating an alias some? would be very helpful. > > > --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
