while (defined($symbol = <IN>))

With this particular construct, Perl automatically adds the defined(), so you can safely omit it if you prefer brevity. 

$ perl -MO=Deparse -e'while ($symbol = <IN>) { chomp($symbol) }'
while (defined($symbol = <IN>)) {
    chomp $symbol;
}
-e syntax OK

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In reply to Re^2: perl leaving out the last value? by Eliya
in thread perl leaving out the last value? by perllearner007

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