examples:
perl -wMstrict -e "my %hash = (foo => 'x', bar => '', baz => undef);
for (qw/foo bar baz quux/) {
printf qq($_ exists:%s: $_ defined:%s: $_ true:%s: \n),
exists($hash{$_}), defined($hash{$_}), $hash{$_} ? 1 : ''
}"
foo exists:1: foo defined:1: foo true:1:
bar exists:1: bar defined:1: bar true::
baz exists:1: baz defined:: baz true::
quux exists:: quux defined:: quux true::
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<small> <strike> <strong>
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<pre> tags. In fact, <pre>
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