Thank you. doseq is probably more what I was looking for. I was
thinking mapcar when I used map, but I really don't want the resulting
seq anyway. I'll be a lot more careful about lazy evaluation, I'm
just not used to it. Again thanks for your response.
On May 30, 8:55 pm, Timothy Pratley
I'm not sure if this is an issue or not. I broke it down to a simple
case. When I pass a Java object into a map closure the object doesn't
seem to get updated:
(let [b (new StringBuffer)]
(map #(.. b (append (str % ))) '(blah blah blah)) b) ;=
#StringBuffer
expected ;= #StringBuffer blah
Lazy evaluation strikes again! map doesn't actually do anything until
you force it eg with dorun. This is quite a common mistake! Does
anyone know how one would go able making a warning be printed when a
lazy seq is created and thrown away without any evaluation? I'd be
interested in implementing
Further to explain this behaviour:
(let [b (new StringBuffer)]
(map #(.. b (append (str % ))) '(blah blah blah)))
#StringBuffer blah blah blah )
If you are using the REPL the return result is the lazy-seq, and this
gets forced to display the result. However in your original code you
