On Jul 6, 2006, at 6:26, Geetha Weerasooriya wrote:
Dear all,
When I was reading a Perl code I found the following line. Can u
please
explain what it means?
!defined($rt_nearest) or $dh<$dist or next;
It means
next unless !defined($rt_nearest) or $dh < $dist;
or, equivalently,
next if defined($rt_nearest) and $dh >= $dist;
The trick in the original code is: the or operator returns as soon as
some of the operands evaluates to true, if any. So if
!defined($rt_nearest)
holds nothing to its right is evaluated. Otherwise we go for
$dh < $dist
If it holds we are done, otherwise we evaluate the following operand
next
which has the secondary effect of jumping to the next iteration
somewhere. Some people dislike using boolean operators to control
flow that way, some people don't.
-- fxn
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