No problem, glad to be of help. :)
Jonathan
On Thu, Mar 28, 2013 at 11:19 PM, Ryan <arekand...@gmail.com> wrote:
> 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 <areka...@gmail.com> 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 <areka...@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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