Thanks guys, I think I will go with this variant that vemv suggested and
upon further exploring I realized it can do much more (still exploring
currently):
*(defn somefn
[req1 req2 **;required params *
*& {:keys [a b c d e]** ;optional params*
*:or {a 1** ;optional params with preset default values other than
the nil default*
* ; b takes nil if not specified on call*
* c 3** ; c is 3 when not specified on call*
*d 0* *; d is 0 --//--*
* ; e takes nil if not specified on call*
* }
:as mapOfParamsSpecifiedOnCall }]
(println req1 req2 mapOfParamsSpecifiedOnCall a b c d e)
)*
*=>* *(somefn 9 10 :b 2 :d 4)*
9 10 {:b 2, :d 4} 1 2 3 4 nil
nil
*=>* *(somefn)*
ArityException Wrong number of args (0) passed to: funxions$somefn
clojure.lang.AFn.throwArity (AFn.java:437)
*=>* *(somefn 9 10)*
9 10 nil 1 nil 3 0 nil
nil
=>* (somefn 9 10 :x 123)*
9 10 {:x 123} 1 nil 3 0 nil
nil
=> *(somefn 9 10 123)*
IllegalArgumentException No value supplied for key: 123
clojure.lang.PersistentHashMap.create (PersistentHashMap.java:77)
=>* (somefn 9 10 123 45)*
9 10 {123 45} 1 nil 3 0 nil
nil
On Sun, Feb 17, 2013 at 10:12 PM, vemv <v...@vemv.net> wrote:
> fn's "keyword arguments" feature provide unrolled, optional key-value args:
>
> (defn foo [& {:keys [a b c]}]
> [a b c])
>
> (foo :c 4) ;; [nil nil 4]
>
>
> On Sunday, February 17, 2013 10:06:13 PM UTC+1, AtKaaZ wrote:
>>
>> Was there a library or some other way to pass ie. maps to functions
>> so that the order of the params isn't predefined, just in case I want to
>> skip some passing parameters without actually having to pass some value for
>> them, I could just refer to which params I'm passing by identifying them
>> with a :key ?
>>
>> It's probably not hard at all to implement, but if there's a lib already,
>> it would do a better job that I could.
>>
>> --
>> Please correct me if I'm wrong or incomplete,
>> even if you think I'll subconsciously hate it.
>>
>> --
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--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
--
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