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( #3333=superdoc: print w/ replies, xml ) Need Help??
You could do it without naming a temporary hash - I'm not recommending you do this, but it was fun writing:
print qq|$_ | for sort keys %{{ +map {$_->{type} => undef} @$data }};
Prints:
Cotton Paper Plastic

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In reply to Re: Get just the unique value by NetWallah
in thread Get just the unique value by Anonymous Monk

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