Come to think of it, none of these recursive subs are tail recursive. They all have a pending && or || business when they return.

I can't think of a simple way to make them tail recursive. The best I can come up with requires using "helper functions": 

sub  OR  { _OR (0, @_) }
sub  AND { _AND(1, @_) }
sub _OR  { my $s = shift; @_ && !$s ? _OR ( $s || shift, @_ ) : $s }
sub _AND { my $s = shift; @_ &&  $s ? _AND( $s && shift, @_ ) : $s }

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the lowliest monk

In reply to Re^3: An infix fix by tlm
in thread An infix fix by tlm

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