The most useful application of this semantic is in a construct like
while (my ($key, $value) = each %hash)
or
if (my ($x, $y) = /(...)(...)/)
If anything is assigned to the list of variables, the result of the assignment
will be at least 1 (or more likely 2, in the cases above). That value is
true and hence the condition succeeds.
This is a case of where the syntax looks quite intuitive and yet it works by
virtue of a language feature virtually no one knows.
--
Peter Scott
http://www.perldebugged.com
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