Here are a couple more alternatives...
sub ReadSource{
my ($DataSource, $HashRef) = @_;
my @Data = get_data();
for (@Data){
my $item = $HashRef->{$_} ||= [];
push( @$item, $DataSource );
}
}
..or..
sub ReadSource{
my ($DataSource, $HashRef) = @_;
my @Data = get_data();
push( @{ $HashRef->{$_} ||= [] }, $DataSource )
for @Data;
}
There really is more than one way to do it!
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