Perl's lack of 'in' keyword

[Peter Corlett]

On 8 Oct 2008, at 16:12, James Laver wrote:
[...]
> I also seem to recall the 'inchworm on a stick', '~-'. I had to  
> google to
> find out what it does, but it seems to be a high precedence  
> decrement[1]

It's a rather sneaky trick based on how two's complement works.

Come steal my copy of "Hacker's Delight" sometime. It's chock full of  
sneaky number tricks like this.