On 03.06.2010, at 10:36, alux wrote: > 1. I can use syntax-quote in the REPL, outside of a macro-definition. > Is this of any use? Does this mean the REPL always macroexpands > everything?
Macro expansion is part of evaluation, whether at the REPL or elsewhere. Syntax quote is not macro expansion. It is a shorhand to write code that, when executed, returns a specific form. It is more frequently used in macro definitions, but you can use it anywhere. You can even look at the code it generates: Clojure> '`(foo (bar ~a) ~b) (clojure.core/seq (clojure.core/concat (clojure.core/list (quote clojure.core/foo)) (clojure.core/list (clojure.core/seq (clojure.core/concat (clojure.core/list (quote clojure.core/bar)) (clojure.core/list a)))) (clojure.core/list b))) > 2. maxroexpand and macroexpand-1 dont extend macros in subforms. Is > there anything that does? clojure.contrib.macro-utils/mexpandall > 3. Is there a way to use macros in higher order functions? Say along > the lines of > > (map def [a b c] [1 2 3]) No. Macros are not functions. BTW, def is a special form, not a macro. But neither can be passed as a function. What you can do, however, is this: Clojure> (map (fn [s v] `(def ~s ~v)) '(a b c) '(1 2 3)) ((def a 1) (def b 2) (def c 3)) Add a "do" in front, and you can pass it to eval: (eval (cons 'do (map (fn [s v] `(def ~s ~v)) '(a b c) '(1 2 3)))) > Btw, am I right that this might be possible in a lazy language? It's not impossible to imagine such a language, but I don't know of any. Konrad. -- 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
