Oh cool! I hadn't thought about this aspect of laziness before. I can see there is some zen here that is worth exploring...
Thanks Mark and Stuart. -Jeff Mark Fredrickson wrote: > Filter is lazy: > > http://clojure.org/api#toc228 > > So you can implement find-first as (first (filter pred coll)) > > -M > > On Feb 10, 2009, at 10:19 AM, Jeff Rose wrote: > > >> Well, in case someone else needs the same function and it isn't built- >> in, here's what I'm using in the meantime. (Based off of the some >> function that comes in core...) >> >> (defn find-first [pred coll] >> (when (seq coll) >> (if (pred (first coll)) >> (first coll) >> (recur pred (rest coll))))) >> >> Cheers, >> Jeff >> >> On Feb 10, 5:18 pm, Jeff Rose <ros...@gmail.com> wrote: >> >>> Hi, >>> Is there a built-in function that will return thefirstitemin a >>> collection that matches a predicate? (Something equivalent to Ruby's >>> Enumerable#find...) Seems pretty basic, but I can'tfindit in the >>> docs. >>> >>> Thanks, >>> Jeff >>> >>> > > - Mark Fredrickson > mark.m.fredrick...@gmail.com > http://www.markmfredrickson.com > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
