On Mon, 2011-10-17 at 04:32 +0000, Guofeng Zhang wrote: > `(let [~@(mapcat (fn [[k v]] [k `'~v]) ctx)] > > And the sample output: > (contextual-eval {'a 1, 'b 2} '(+ a b)) > > I do not understand why "`'~v" has be to used this way. If I used "`~v" > instead (that is, remove the quote), it still works. So my question is, why > "~v" needs to be first quoted and then syntax-quoted?
It appears to work the same in both of your samples because the numbers, e.g. 1 and 2, are self-evaluating. Try (contextual-eval '{a (+), b (1 2)} '(concat a b)) to see the difference. (Hint: it should yield (+ 1 2), literally.) -- Stephen Compall ^aCollection allSatisfy: [:each|aCondition]: less is better -- 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