maybe you want 
print Dumper [map {$_ => get_day_name($_)} <DATA>];

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map returns a list. The []'s return a reference to an anonymous array created from that list.

Update I should have read the question more closely. He does want a hash back. See clintp's response.

In reply to Re: Printing a reference to the output of map by mikeB
in thread Printing a reference to the output of map by sierrathedog04

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