you have to partition it first.

user=> (partition 2 [1 2 3 4 5 6 7 8])
((1 2) (3 4) (5 6) (7 8))


let's say we want to add the numbers.

user=> (map #(apply + %) (partition 2 [1 2 3 4 5 6 7 8]))
(3 7 11 15)



On Wed, Jul 21, 2010 at 10:20 PM, Glen Rubin <rubing...@gmail.com> wrote:
> Hi!  I want to process a collection 2 elements at a time using map.
>
> My function accepts 2 parameters (a,b) and returns a result (c):
>
> (myfcn [a b])
>
>  => c
>
> so I want to iterate myfcn over a collection and create a new sequence
>
> for example let's say myfcn sums a and b, then i would like to do
> something like this:
>
> (map myfcn '(1 2 3 4 5 6 7 8)
>
> => 3 7 11 15
>
> accept i get the error that myfcn is being passed the wrong number of
> arguments, since map is passing them in 1 at a time.  How do I get map
> to pass in 2 at a time?
>
> thx!
>
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