Re: dolist vs. while-loop (was Re: epg and expired recipient keys)

[Miles Bader <miles@gnu.org>]

Katsumi Yamaoka <yamaoka@jpl.org> writes:
> I also used Lars' benchmark.el.  Please note that the later test
> has nested two dolist forms like the one that Wolfram Fenske wrote.
> I guess the reason it is slower than the while-loop version is that
> the `let' form in the inside dolist is used many times.

It doesn't do any binding in the inner loop though.  let-binding has
some cost in elisp, but getting rid of lets (like using while instead of
dolist) is something you do when you desperately need speed; otherwise
the decrease in readability is simply not worth it.

-Miles

-- 
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