Re: extracting only those keys with uniq values in array list

[BillKSmith]

Every reply you have received so far has a different interpretation of your requirements. If you are lucky, someone will correctly guess what you intend and post a solution. However, I recommend that you restate the problem in a way that we can all understand without guessing. Note that the word 'unique' can be ambiguous. It can mean 'values that only occur once' or 'the first occurrence of each value'. The function uniq of List::Util which you reference assumes the latter.

[v15]

I agree with you. I edited the question so hopefully it makes more sense. Thanks

[BillKSmith]

Thanks for the clarification. Build the hash exactly as you show. Process the keys with grep

use strict;
use warnings;

my %r_name = (
    a => [ 1, 2 ],
    b => [ 3, 3 ],
    c => [ 1, 6 ],
);

my @result = grep {$r_name{$_}[0] eq $r_name{$_}[1]} keys %r_name;
print @result, "\n";

Result

b

Note for next time: It is considered impolite to edit your post in a way that invalidates existing replies. Leave the existing text. Add a clearly marked UPDATE section.

[AnomalousMonk]

Further to BillKSmith's reply:   Please see How do I change/delete my post? for site etiquette and protocol regarding post changes.