Because symbols can only take one argument:
('vector :a) ---> nil
('vector :a :i :x) ---> the exception you saw.
On Wed, Mar 18, 2015 at 2:01 PM, John Gabriele <jmg3...@gmail.com> wrote:
> I see that you can pass extra args to `apply` --- between the func and the
> coll args --- and `apply` will prepend the extras to the coll before
> proceeding. For example, these all work:
>
> (apply + [1 2 3 4])
> (apply + 1 2 [3 4])
> (apply + 1 2 '(3 4))
>
> While thinking about how the following works:
>
> ~~~
> (apply map vector [[:a :b :c]
> [:i :j :k]
> [:x :y :z]])
> ~~~
>
> I found this:
>
> ~~~
> some-app.core=> (apply map [vector [:a :b :c] [:i :j :k] [:x :y :z]])
> ([:a :i :x] [:b :j :y] [:c :k :z])
>
> some-app.core=> (apply map '(vector [:a :b :c] [:i :j :k] [:x :y :z]))
> ArityException Wrong number of args (3) passed to: Symbol
> clojure.lang.AFn.throwArity (AFn.java:429)
> ~~~
>
> Why does it fail when I pass a list there instead of a vector?
>
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