You can use the doc function to find out what json-str does:
(doc json-str)
-------------------------
clojure.contrib.json.write/json-str
([x])
Converts x to a JSON-formatted string.
nil
json-str is a function of its arguments, and it does not do anthing
side-effecty like capturing stdout.
Putting something with side effects ('do' or 'print') inside a lazy expression
like 'for' is a bad idea in most cases. The side effects will happen later (if
ever) when the lazy sequence is consumed.
What are you trying to do?
Stu
> Macintosh:clojurefun wojtek$ ./runfile.sh
> Clojure 1.1.0
> user=> (use 'clojure.contrib.json.write)
> nil
> user=> (json-str (for [a [1 2 3]] (do (print "a") "b")))
> "[aaa\"b\",\"b\",\"b\"]"
>
>
> I think json-str shouldn't capture the printed a's, should it?
>
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