chickadee » srfi-116 » ifor-each

The arguments to ifor-each are like the arguments to imap, but ifor-each calls proc for its side effects rather than for its values. Unlike imap, ifor-each is guaranteed to call proc on the elements of the ilists in order from the first element(s) to the last, and the value returned by ifor-each is unspecified.

(let ((v (make-vector 5)))
  (ifor-each (lambda (i)
              (vector-set! v i (* i i)))
            (iq 0 1 2 3 4))
  v)  ;=>  #(0 1 4 9 16)