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false && false => false   \ Short circuit possible
false && true  => false   /
true  && false => false
true  && true  => true

sub zero  { print "zero\n";  0 }
sub two   { print "two\n";   2 }
...
my $x = zero  && two;    print "\$x is = $x\n\n";
my $y = three && zero;   print "\$y is = $y\n\n";
my $z = two   && three;  print "\$z is = $z\n\n";

zero
$x is = 0     <--- two never called
...
two
three
$z is = 3