On Tue, Feb 07, 2017 at 08:13:06AM +0100, Alexander Burger wrote:
> Better to use (not Lst).

One more note: I even try to avoid 'not' whenever possible, as it is an
additional function call overhead.

It is often possible to use the complementary flow function,
like (ifn Lst ..) instead of (if (not Lst) ..).

   if    <->   ifn
   and   <->   nor
   or    <->   nand
   when  <->   unless
   cond  <->   nond
   while <->   until

♪♫ Alex
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