Hi Zak, I think this is a reasonable use of eval, since you're evaluating an expression that is generated at run-time. The alternatives are messy.
-Stuart Sierra On Jan 23, 10:20 am, Zak Wilson <zak.wil...@gmail.com> wrote: > I'm trying my hand at genetic programming. (Full post about why and > how, with code coming soon - I promise.) My current technique uses a > genetic algorithm to generate a list of symbols, numbers and other > lists of the same form. The head is the name of any of several > functions. I'm trying to figure out a good way to bind the symbols > that appear in these lists and evaluate them as code. My current > technique looks like this: > > (def a) > (def b) > (defn try-rule [r val-a val-b] > (binding [a val-a > b val-b] > (eval r))) > > and an example call looks like: > (try-rule '(+ a b) 2 4) > > I know that calls to eval are discouraged outside of writing something > like a REPL. I'm looking for a better way to do this. Note that > binding a and b when the rules are generated or using actual values > instead of symbols won't work because each rule actually needs to be > tested against hundreds of possible values. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
