#use strict;
#use warnings;

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Why do you comment out these two lines? It is usually a very bad idea.

Otherwise, the more idiomatic way to write your foreach loop would be to declare $key within the loop: 

foreach my $key (keys %data) {
    print "$key,$data{$key}\n";
}

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In reply to Re^4: How to Map a scalar to a key that is an array? by Laurent_R
in thread How to Map a scalar to a key that is an array? by symgryph

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