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 :)
>>>
>>> --
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "Clojure" group.
>>> To post to this group, send email to clo...@googlegroups.com
>>> Note that posts from new members are moderated - please be patient with
>>> your first post.
>>> To unsubscribe from this group, send email to
>>> clojure+u...@googlegroups.com
>>> For more options, visit this group at
>>> http://groups.google.com/group/clojure?hl=en
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "Clojure" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to clojure+u...@googlegroups.com.
>>> For more options, visit https://groups.google.com/groups/opt_out.
>>>
>>>
>>>
>>
>>
--
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
