Hello, stuhood a écrit : > Functions like (+), (*), (-), (and probably more) should support > sequences as parameters. > > The current way to accomplish this (without implementing your own sum > using reduce) seems to be: > >> (apply + (map #(. Math pow 2 %) (range 10))) >> > ... which has to generate the sequence first. > This is a common misconception: passing a seq to apply doesn't force its evaluation. You can test this fact by passing an infinite seq to a function: (defn second-arg [& args] (second args)) user=> (apply second-arg (iterate inc 0)) 1
and (apply + some-seq) is really equivalent to (reduce + some-seq), see the def of + in core.clj: (defn + ... ([x y & more] (reduce + (+ x y) more))) Christophe -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.blogspot.com/ (en) --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
