On 26/08/10 12:17, Eric J. Van der Velden wrote:
Hello,
I don't understand what the manual says about when there are more then
two arguments to map or for-each.
With two arguments, the last one must be a list, so OK is
(for-each display '(1 3))
But the following are ERR,
(for-each display 1 3)
(for-each display '(1 3) '(1 3))
The function, in this case `display', needs to be able to take 2 args,
for display it's the variable and the port:
(for-each display '(1 3) (list (current-output-port) (current-output-port)))
also consider
(map + '(1 3) '(1 3))
Paul.
