On Wed, Jun 24, 2015 at 8:29 AM, Herwig Hochleitner <hhochleit...@gmail.com> wrote:
> > > 2015-06-24 1:25 GMT+02:00 Ben Wolfson <wolf...@gmail.com>: > >> On Tue, Jun 23, 2015 at 4:17 PM, Ghadi Shayban <gshay...@gmail.com> >> wrote: >> >>> >>> Tangentially: >>> (remove even?) >>> Will be faster than >>> (remove (fn [i] (even? i))) >>> because in the first case the dereference of the var 'even?' happens >>> only once and the value inside the var will be passed to `remove` at the >>> outset. In the second example the var dereference happens for every single >>> item (though it's very cheap). The second example is equivalent to writing >>> (remove >>> #'even?) >>> >> >> I can't seem to observe a difference between the two cases. >> > > A simple var reference like even? compiles to a fetch of its root val: > @#'even? > In the first case, that happens only once, passing the resulting fn object > to remove. In the second case, the deref happens every time the fn is > called, thus allowing for redefinition of even?. > I meant a difference in speed. -- Ben Wolfson "Human kind has used its intelligence to vary the flavour of drinks, which may be sweet, aromatic, fermented or spirit-based. ... Family and social life also offer numerous other occasions to consume drinks for pleasure." [Larousse, "Drink" entry] -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
