Your function never actually ends because even the empty list evaluates to true :)
rlm.dna-melting> (if (rest '()) true false) true rlm.dna-melting> (if (next '()) true false) false so, changing your list length function to use next will work rlm.dna-melting> (defn list-length [col] (if col (+ 1 (list-length (next col))) 0)) #'rlm.dna-melting/list-length rlm.dna-melting> (list-length (range 5)) 5 hope that helps, --Robert McIntyre On Sun, Dec 5, 2010 at 4:52 PM, HB <[email protected]> wrote: > Hi, > I'm trying to write a function that calculates the length of a list: > > > (defn list-length [col] > (if col > (+ 1 (list-length(rest col))) > 0)) > > > (list-length '(Java, Clojure, Scala)) > > Upon running it in the REPL, I got the error: > java.lang.StackOverflowError (test.clj:3) > > What is going wrong? > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > [email protected] > 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 post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
