On 31/03/14 23:25, Lee Spector wrote:
(defn functionalise
[ex var]
(eval (list 'fn (vector var) ex)))
(def ex '(+ 1 x))
(def exf (functionalise ex 'x))
(exf 3) ;; => 4
This calls eval only once when you call functionalise, and doesn't do any tree
walking.
FWIW this is the trick I use in the tiny genetic programming system at:
https://github.com/lspector/gp/blob/master/src/gp/evolvefn.clj
-Lee
That would not work with a symbol other than x:
(defexf (functionalise ex '*z*))
How about this:
(defnfunctionalise [ex var]
(eval`(fn[~(clojure.core/symbol "xp")]
~(clojure.walk/postwalk-replace {var'xp}ex))))
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