How can I construct a function, that nondestructive appends an element to a list and return modified list?
I wrote so:
But the idea is so usual, that I suspect, there is more fine way, without using
(append lst (list one-element))
... I use 'print-ln' insead of println under windows to handle unix-generated text files.
(define (mypush) (flat (append (args))))
> (set 'lst (mypush 1 2 3))
(1 2 3)
> (mypush lst 4)
(1 2 3 4)
...or is this not what you want?
Peter
Thats destructive, DMI ment non-destrutive ;-)
It's non destructive:
> (set 'lst (mypush 1 2 3))
(1 2 3)
> (mypush lst 4)
(1 2 3 4)
> (println lst)
(1 2 3)
Its surly is ...:)