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07-28-2007
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perl hash question
Below is one article I was reading and I don't understand the Code:
$seen{$_} = 1
Can someone explain this in easier terms plesae? ____________________________________________________________ We can also take advantage of the uniqueness property of hash keys to filter out duplicates from a list. For example, suppose we need to examine lines of a file, generating an output that consists of only one line even if the line is duplicated. Easy enough: Code:
%seen = ();
while (<>) {
$seen{$_} = 1;
}
foreach (sort keys %seen) {
print;
}
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