chickadee » scheme » base » vector-map

It is an error if proc does not accept as many arguments as there are vectors and return a single value.

The vector-map procedure applies proc element-wise to the elements of the vectors and returns a vector of the results, in order. If more than one vector is given and not all vectors have the same length, vector-map terminates when the shortest vector runs out. The dynamic order in which proc is applied to the elements of the vectors is unspecified. If multiple returns occur from vector-map, the values returned by earlier returns are not mutated.

(vector-map cadr '#((a b) (d e) (g h)))   
==> #(b e h)

(vector-map (lambda (n) (expt n n))
            '#(1 2 3 4 5))                
==> #(1 4 27 256 3125)

(vector-map + '#(1 2 3) '#(4 5 6 7))       
==>  #(5 7 9)

(let ((count 0))
  (vector-map
   (lambda (ignored)
     (set! count (+ count 1))
     count)
   '#(a b)))                      ==>  #(1 2) or #(2 1)