On 8 February 2010 12:45, Roman Roelofsen <roman.roelof...@googlemail.com> wrote: > Hi, > > just for practicing Clojure's macros I wrote the following > create-java-list macro. > > (defmacro create-java-list > [& forms] > (let [prefixfn (fn [obj form] (cons (symbol ".") (cons obj form))) > lname (gensym)] > `(let [~lname (java.util.ArrayList.)] > ~@(map (partial prefixfn lname) forms) > ~lname))) > > The idea is that you can write > > (let [javalist (create-java-list > (add "1") > (add "2"))] > (prn javalist)) > > instead of > > (let [javalist (java.util.ArrayList.)] > (.add javalist "1") > (.add javalist "2") > (prn javalist))
Try this: user=> (doto (java.util.ArrayList.) (.add "1") (.add "2")) #<ArrayList [1, 2]> > Is it possible to create the macro without the (gensym) call? I wasn't > able to use something like lname#. Sorry, I'm not sure why that doesn't work. -- Michael Wood <esiot...@gmail.com> -- 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
