On Monday, March 31, 2014 12:13:25 PM UTC-5, Jony Hudson wrote: > > > (defmacro functionalise > [ex var] > (let [arg (gensym) > body (postwalk-replace {var arg} ex)] > `(fn [~arg] ~body))) > > This works as written, it is just that macros do not evaluate their arguments, so you do not want to quote you expression.
(def foo (functionalise (+ 2 x) x)) (foo 40) ;=> 42 If you are working with quoted expressions, you'll have to eval in the macro and take the one-time hit there (defmacro functionalise2 [ex var] (let [arg (gensym) body (clojure.walk/postwalk-replace {var arg} ex)] `(fn [~arg] ~(eval body)))) (def foo2 (functionalise2 '(+ 2 x) x)) (foo2 40) ;=> 42 -- 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.