For every key($r_name) , I have 2 values. I want to print the names of those keys($r_name) where the 2 values for a particular key($r_name) are same. If the 2 values for the particular key are different from each other, then I do not want to output that key. 
use strict;
use warnings;

use Test::More tests => 1;

my %read2seq = (
    foo => [123, 123],
    bar => [456, 789]
);

my @want = ('foo');

my @samevals = grep { $read2seq{$_}->[0] eq $read2seq{$_}->[1] } keys 
+%read2seq;

is_deeply \@samevals, \@want;

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In reply to Re: extracting only those keys with uniq values in array list by hippo
in thread extracting only those keys with uniq values in array list by v15

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