Oops, thanks
On May 26, 9:45 am, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> Please refer to Chouser's answer for your main point,
>
> Regards,
>
> --
> laurent
>
> 2009/5/26 Sean Devlin <francoisdev...@gmail.com>:
>
>
>
> > Okay, excellent counterexample for some. I understand that behavior
> > now.
>
> > I guess I should focus on my main point, changing/aliasing the name to
> > some? to be consistent with every?
>
> > On May 26, 9:34 am, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> >> 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
-~----------~----~----~----~------~----~------~--~---
