In Perl we can run user defined code blocks at different stages when running a program.

1. BEGIN blocks are run as soon as Perl finds them. If there is more than one block they get executed in the order they are found.
2. CHECK blocks are run as soon as Perl finishes compiling. If there is more than one CHECK block they get executed in the reverse order they are found.
3. INIT blocks are executed after CHECK blocks, and if more than one exists they get executed in the order they appear.
4. END blo…

Here is an example of what a module can look like. In this case it only has a simple method that greets the user:

class Greeter;

method greet($name = 'world') {

   say "hello $name";

}

Now to use the module we can write something like:

BEGIN { @*INC.push('Greeter/lib') }

use Greeter;

my $x = Greeter.new;

$x.greet('rakudo');

The only tricky part is actually the push in the BEGIN block, to add your lib directory. Of course running this is as simple as:

$ ./perl6 greeter.p6 
hello rakudo