...even cheezier, use do
#(do {:foo %})
On Saturday, 30 March 2013 23:58:31 UTC-4, JvJ wrote:
>
> Here's a cheezy hack, use identity.
>
> #(identity {:foo %})
>
> On Thursday, 28 March 2013 17:51:10 UTC-4, Ryan 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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>>>>
>>>
>>>
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