Think Perl 6: How to Think Like a Computer Scientist by Laurent Rosenfeld & Allen B. Downey

Author:Laurent Rosenfeld & Allen B. Downey [Rosenfeld, Laurent]
Language: eng
Format: azw3
Publisher: O'Reilly Media
Published: 2017-05-08T04:00:00+00:00

Creating a new type is a bit more complicated than the other options, but it has advantages that will be apparent soon.

A programmer-defined type is usually created by a class (or a role, but we will come back to that later). A barebones class definition for a point type looks like this:

class Point2D { has $.abscissa; # "x" value has $.ordinate; # "y" value }

The header indicates that the new class is called Point2D. The body is defining two attributes, i.e., named properties associated with the class, here the abscissa and ordinate (or x and y coordinates) of the point.

Defining a class named Point2D creates a type object.

The type object is like a factory for creating objects. To create a point, you call the new method on the Point2D class:

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