Using for instead of map:
use strict;
use warnings;
use Data::Dumper;
my @a = ("M94202", "M94150", "M94297", "M94150", "M94161", "M94161", "
+M94162");
my ( $n, %h ) = -1;
$_ = $h{$_} //= $n+=2 for @a;
print Dumper \@a;
I suppose if you were playing golf, without use strict, you might write:
my ( $n, %h ) = -1;
$_ = $h{$_} //= $n+=2 for @a;
in one-line as:
$_=$h{$_}//=$}+=2-!$}for@a;
(/me ducks)
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