Along with that, it's also for doing things like my $old = "foo"; my $new = $old =~ s/foo/bar/r; $old still contains "foo" and $new contains "bar", but insi

Along with that, it's also for doing things like my $old = "foo"; my $new = $old =~ s/foo/bar/r; $old still contains "foo" and $new contains "bar", but inside a map should be great as well.