On Dec 16, 8:13 am, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> 2009/12/15 DTH <dth...@gmail.com>
> >
> > (return-fn (some predicate-fn (iterate recur-fn a0)))
>
> > would seem equivalent, though I doubt I'd have got there without your
> > stepwise guide to change the way I was thinking about it.
>
> No, some does not work here. Dean gave the final word, I think, by reminding
> us of filter.
>
> some does not work because it will return the result of applying
> predicate-fn to the item, but we want the item "intact" in order to apply
> return-fn to it.
>

Gah, of course; my toy implementation of f6? happened to return the
argument when logical true, which made it appear to work; I completely
forgot that `some` itself was not handling this.  I read both Sean's
response and your note on some while both my original messages were in
moderation, and couldn't face sending another "badger, got that one
wrong..." email on the heels of the first two...

Cheers,

-Dave

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