Use a frickin hash!
use strict;
use warnings;
my @gl = qw(
CD9
TBN
NANOG
KITL
FUT4
SALL4
MYC
STAT3
ESRRB
AKP2
SOX2
POU5F1
KLF4
);
my @hfr_genes = qw(
LYPLA1
LYPLA1
LYPLA1
LYPLA1
STAT3
LYPLA1
LYPLA1
STAT3
LYPLA1
LYPLA1
LYPLA1
LYPLA1
SOX2
);
# First thing: convert @hfr_genes into a hash!!!
# Looking up a hash key is much faster than grepping an array.
my %hfr_genes;
$hfr_genes{$_}++ for @hfr_genes;
# Now loop through the first list
for (@gl) {
my $count = $hfr_genes{$_};
print "Value $_ is present $count times\n" if $count;
}
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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