Eric a écrit : > He said that I should use clojure.core/list instead of #'list. That > is, to reference it with a fully-qualified name. But my understanding > is that binding still changes clojure.core/list withing the binding > form. Here, from my REPL: > > (let [list 10] > (binding [list +] > (clojure.core/list 1 2 3))) > > => 6 > > So, my question is this: what is the difference/relationship between > #' and the fully-qualified name? >
There's not so much difference when they are used in function position but in argument position they behave differently. Below is an example (from http://clj-me.blogspot.com/2009/01/shadowing-global-names.html) where you can see that with a name (I could have used a qualified name) you pass the current value of the binding while with #' you pass the var itself and those values will behave differently if they are "leaked" outside of the calling scope (eg: sent to another thread or agent, used in a lazy sequence or a delay, stored in a mutable box etc.) (def a (map str (range 10))) (def b (map #'str (range 10))) (take 5 a) /("0" "1" "2" "3" "4")/ (take 5 b) /("0" "1" "2" "3" "4")/ (binding [str identity] (doall a)) /("0" "1" "2" "3" "4" "5" "6" "7" "8" "9")/ (binding [str identity] (doall b)) /("0" "1" "2" "3" "4" *5 6 7 8 9*)/ Christophe --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
