Hi guys,
I have a list (which i don't know the size of) and i want to do
something like this:
(doto (MutatingJavaObject.) (.add (first list-items)) (.add (second
list-items)) ..... (.add (last list-items)))
Now I may be doing this the complete wrong way, so if you have a
better solution please tell me. but i've been trying to build a macro
to expand this out, given the object, the function to call and the
list of items.
i've been playing with various things, and manage to get a few things
that work if i pass the list of items in without being a list (i.e. (1
1 1) rather than '(1 1 1) or (list 1 1 1)) for example (defmacro d2
[obj func inputs] (concat (list 'doto obj) (map #(list func %)
inputs))) but if i try and pass in my list-items variable it just
complains that it "Don't know how to create ISeq from:
clojure.lang.Symbol".
perhaps i'm not fully grasping the concept of macros? i'm very new to
lisp and FP in general.
while writing this email i had a light switch on that i could simply
do it like this:
(let [obj (MutatingJavaObject.)]
(loop [in list-items]
(when (not (empty? in))
(.add obj (first in))
(recur (rest in))))
obj)
but i would still like to know if there is a way i could get the macro
i wanted going.
please help! my googling and trauling through Stuart Halloway's book
have come up naught.
thanks in advance!
-Tristan
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