syntax HOW

Documentation for syntax HOW assembled from the following types:

language documentation Meta-object protocol (MOP)

From Meta-object protocol (MOP)

(Meta-object protocol (MOP)) syntax HOW

Returns the metaclass object, as in "Higher Order Workings".

say (%).HOW.^name # OUTPUT: «Perl6::Metamodel::ClassHOW+{<anon>}␤» 

HOW returns an object of type Perl6::Metamodel::ClassHOW in this case; objects of this type are used to build classes. The same operation on the & sigil will return Perl6::Metamodel::ParametricRoleGroupHOW. You will be calling this object whenever you use the ^ syntax to access meta methods. In fact, the code above is equivalent to say (&) which is much more unwieldy. Metamodel::ClassHOW is part of the Rakudo implementation, so use with caution.