I'm just learning lisp but wouldn't a macro be overkill?
; manually add each item
(doseq [item items]
(.add obj item))
; or wrapped in a function
(defn add-all [obj items]
(doseq [item items]
(.add obj item)))
(add-all obj items)
If your java object had an addAll method that accepted a collection,
then you probably could do:
(.addAll obj items)
I'm wondering why you want it to be a macro?
Allen
On Tue, Dec 15, 2009 at 12:31 PM, tristan <[email protected]> wrote:
> 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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