chickadee » srfi-127 » lseq-for-each

The arguments to lseq-for-each are like the arguments to lseq-map, but lseq-for-each calls proc for its side effects rather than for its values. Unlike lseq-map, lseq-for-each is guaranteed to call proc on the elements of the lseqs in order from the first element(s) to the last, and the value returned by lseq-for-each is unspecified. If none of the lseqs are finite, lseq-for-each never returns.

(let ((v (make-vector 5)))
  (lseq-for-each (let ((count 0))
                   (lambda (i)
                     (vector-set! v count (* i i))
                     (set! count (+ count 1))))
                 '(0 1 2 3 4))
  v)
 ;=> (#0 1 2 3 4)