It's because the #() syntax always calls the content as a function.
So #(...) is the same as (fn [] (...)). In your case,
#({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)})
is the same as:
(fn [%] ({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}))
Note the extra () around {}. In other words, your map is called
as a function.
Maps can normally be called as functions, like this:
({:hello :world} :hello)
=> :world
That's why you get the "Wrong number of args" error
(and not a "a map is not a function" error).
Hope that makes sense.
Btw, hyphen is normally used instead of underscore
in both variables and keywords. Just a slight style
"issue", but maybe you had your reasons. :)
Jonathan
On Thu, Mar 28, 2013 at 10:16 PM, Ryan <arekand...@gmail.com> wrote:
> Hello!
>
> I am having a small issue with a hash-map initialization and I am failing
> to understand why. I have the following situation:
>
> (def a-list '({:BAR_KEY bar-value}, {:BAR_KEY another-value}))
>
>
> (defn my-function [foo-id a-keyword a-list]
>
> (map #({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}) a-list))
>>
>
> So, by running the above function like this:
>
> (my-function 5 "my_keyword" a-list)
>
>
> I get the following error:
>
> *clojure.lang.ArityException: Wrong number of args (0) passed to:
>> PersistentArrayMap*
>
>
> I am trying to get the following result:
>
> ({:foo_id 5 :my_keyword bar-value}, {:foo_id 5 :my_keyword another-value})
>
> Any ideas? I have played around in repl for the last 2 hrs but I haven't
> found the proper way to do this.
>
> Thank you for your time :)
>
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