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my ($rank) = grep {$sorted_array[$_] eq $my_target} 0..$#sorted_array;

sub index_of {
  my $thing = shift;
  my @indexes = grep $_[$_] eq $thing, 0..$#_;
  wantarray ? @indexes : $indexes[0];
}

my $rank = index_of($my_target, @sorted_array);

my %sorted_index;
$sorted_index{$sorted_array[$_]} = $_ foreach 0..$#sorted_array;

my %sorted_index = map {($_, $sorted_array[$_])} 0..$#sorted_array;

my @doubled = map {($_, $_)} 1..50_000;

my %sorted_index;
@sorted_index{@sorted_array} = 0..$#sorted_array;