Re: [FWP] Golf (7, er 16 strokes is par!)

[Bennett Todd <bet@rahul.net>]

2000-05-02-11:53:04 Jeff Pinyan:
> On May 2, Bennett Todd said:
> >which comes to 14 if I count right. Sure is a shame that there isn't
> >a ^^ operator, which like && and || would treat its args as booleans
> >rather than bitstrings. They could have done that when they
> >introduced xor, but as best I can tell they didn't.
> 
> Camel, ed. 2, pg. 94:
> 
>   There is also a logical B<xor> operator that has no exact counterpart in
>   C or Perl, since the other XOR operator (^) works on bits.  The best
>   equivalent for C<$a xor $b> is perhaps C<!$a != !$b>[1].  This operator
>   can't short-circuit either, since both sides must be evaluated.

Thanks for straightening me out, Jeff.

I really thought I tested it out, but it looks like

	$_ xor!($_&$_-1)

does in fact work, although, at 16 bytes, it's longer than my
previous 14-byte (sense inverted)

	!$_^!($_&$_-1)

which is in turn longer than Ilmari Karonen's wonderful little
11-byte:

	$_&$_-1|!$_

which is also simpler. So far I think Ilmari is the winner.

-Bennett

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