On Tue, 09 Oct 2018 19:31 +0200, Alexander Burger wrote:
> On Tue, Oct 09, 2018 at 01:21:07PM -0400, John Duncan wrote:
> > Yes, you couldn't reuse the same initial value for a data structure like
> > you would in scheme
>
> How do you mean that? As I said, this code is completely free of destructive
> side effects. You can use and reuse any initial value.
Indeed.
$ pil
(de foldl (F I . @)
(pass
mapc
'(@
(setq I (apply F (conc (rest) (cons I)))) ) ) )
-> foldl
: (setq I 0)
-> 0
: (foldl '+ 0 (1 2 3 4))
-> 10
: I
-> 0
"Inside" `foldl` there is some "Hulk smash!"ing going on, but not outside.
`foldl` owns `I` and smashes on it with impunity; that's not a problem.
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