Thanks for all your help Jonathan :) I went with the standard fn syntax,
its a two-liner anyway so not a big of deal :)
The important part here was that I learned that #() executes the content as
a function, very helpful!
Ryan
On Friday, March 29, 2013 12:08:04 AM UTC+2, Jonathan Fischer Friberg wrote:
>
> It can still be done with the #(), with for example the hash-map function.
> It's basically the same as the {} but as a function, like this:
> (hash-map :a 3 :b 4)
> => {:a 3, :b 4}
>
> So you should be able to write the function as:
> #(hash-map :foo_id foo-id (keyword a-keyword) (:BAR_KEY %))
>
> I think you should use the standard (fn []) syntax though, since it's
> shorter.
>
> > 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 :)
> I see. :)
>
> Jonathan
>
>
> On Thu, Mar 28, 2013 at 10:51 PM, Ryan <[email protected]
> <javascript:>>wrote:
>
>> 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 <[email protected]> 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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