Thanks Gary, it didn't cross my mind that i can use the # reader with the
threading macro :)
On Tuesday, April 2, 2013 4:15:58 PM UTC+3, Gary Verhaegen wrote:
>
> And there's the threading macro : #(-> {:foo %})
>
> On 1 April 2013 07:12, Ryan <[email protected] <javascript:>> wrote:
> > Thanks for your input guys
> >
> > Ryan
> >
> >
> > On Sunday, March 31, 2013 11:11:08 AM UTC+3, Alex Baranosky wrote:
> >>
> >> There's also 'for'
> >>
> >> (defn my-function [foo-id a-keyword a-list]
> >> (for [m a-list]
> >> {:foo_id foo-id (keyword a-keyword) (:BAR_KEY m)}))
> >>
> >>
> >> On Sun, Mar 31, 2013 at 12:57 AM, JvJ <[email protected]> wrote:
> >>>
> >>> ...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 <[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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