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# When you call a method, you do so with an invocant. 
# When you call a method on an object, that object is the invocant:
my $choco = Cat->new;
$choco->sleep_on_keyboard;

# A method's first argument is its invocant($self). Suppose a Cat can meow():
package Cat {
  use Moose;
  
  sub meow {
    my $self = shift;
    say 'Meow!';
  }
}
# the cat always meows three times at 6 am 
my $fuzzy_alarm = Cat->new;
$fuzzy_alarm->meow for 1..3;