Wait. Should be:
(defn f [& args] (let [default-args-atom (atom {:a 1 :b 2 :c 3 :d 4}) kwds
(vec [:a :b :c :d)
kwargs (map-indexed (fn [idx arg] (if
(keyword? arg) (swap! default-args-atom assoc arg (get args (inc idx)))
(swap! a assoc (get kwds idx) arg))) args)]
(function-that-actually-does-what-i-want-to-do (:a @default-args-atom)
(:b @default-args-atom) (:c @default-args-atom) (:d @default-args-atom)))
because there's no guarantee that (vec (keys @default-args-atom)) will
return the keys in the same order.
On Sunday, July 20, 2014 8:45:02 PM UTC-4, Sam Raker wrote:
>
> I hacked this together:
>
> (defn f [& args] (let [default-args-atom (atom {:a 1 :b 2 :c 3 :d 4}) kwds
> (vec (keys @default-args-atom))
> kwargs (map-indexed (fn [idx arg] (if
> (keyword? arg) (swap! default-args-atom assoc arg (get args (inc idx)))
> (swap! a assoc (get kwds idx) arg))) args)]
> (function-that-actually-does-what-i-want-to-do (:a @default-args-atom)
> (:b @default-args-atom) (:c @default-args-atom) (:d @default-args-atom)))
>
> But it seems kind of gross to me. Is there a cleaner solution?
>
> On Sunday, July 20, 2014 8:16:55 PM UTC-4, Alex Baranosky wrote:
>>
>> You can get keyword args like this:
>>
>> (defn f [& {:keys [a b c d]
>> :or {a 1 b 2 c 3 d 4}}]
>> [a b c d])
>>
>> But you cannot also get the ability to call:
>> (f 5 6 7 8)
>>
>>
>> On Sun, Jul 20, 2014 at 4:13 PM, Sam Raker <[email protected]> wrote:
>>
>>> I'm trying to write a function that takes (up to) 4 arguments. I want to
>>> be able to supply every argument positionally, with a keyword or as a
>>> default, so that
>>>
>>> (f)
>>> (f 1)
>>> (f 1 2)
>>> (f 1 2 3)
>>> (f 1 2 3 4)
>>> (f 1 :b 2)
>>> (f 1 2 :c 3)
>>> ...
>>> (f :a 1 :b 2 :c 3 :d 4)
>>>
>>> are all equivalent. In Python, I could do this by
>>>
>>> def f(a=1,b=2,c=3,d=4):...
>>>
>>> but I'm not sure how to do it in Clojure.
>>>
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>>
>>
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