Thanks for your explanation Jonathan. I am still a bit confused however
what is the proper solution here. Should i use an anonymous function
instead to do what I want or can it be done with the #() syntax?
Hyphens is my preferred way as well, but, those keys represent sql columns
which they use underscore so I gotta go with underscores in order code to
match them :)
Ryan
On Thursday, March 28, 2013 11:24:38 PM UTC+2, Jonathan Fischer Friberg
wrote:
>
> 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 <areka...@gmail.com
> <javascript:>>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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