What problem are you trying to solve? On Thu, Mar 19, 2015 at 12:49 PM, Mark Bastian <markbast...@gmail.com> wrote:
> Hi All, > > I am trying to write a simple macro to resolve local symbols and I just > can't seem to figure out the right invocation. Here are some commands you > can type/paste in a repl: > > (def ONE 1) ;define one > (def s1 (symbol "ONE")) ;get the symbol > (eval s1) ;evaluates to 1, no surprise > > > ;My goal is to pass a symbol into a macro or function, have it evaluate to > its defined value, then use it. > ;I would like these to happen > (add-3 s1) ;Should evaluate to 4 > (add-3 (symbol "ONE")) ;Should evaluate to 4 > > ;The following works, but uses eval, which I am told is less desirable. My > current understanding is that a macro is the way to go. > (defn add-three-fn[s](+ 3 (eval s))) > (add-three-fn (symbol "ONE")) ;4 - it works! > > ;Here is one of my failed attempts at a macro version: > (defmacro add-3 [s] `'(+ 3 ~s)) ;Just puts unevaluated contents in s > > I'd post other examples, but I can't even see straight anymore. Any help > would be appreciated. > > Thanks, > Mark > > -- > 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. > -- 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.
