July 2011
Intermediate to advanced
104 pages
2h 14m
English
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Special Classes
The special class UNIVERSAL contains methods that are automatically inherited by all other classes:
- can method
Returns a reference to the method if its invocant has it, undef otherwise.
- DOES role
Checks if the object or class performs the given role.
- isa class
Returns true if its invocant is class, or any class inheriting from class.
- VERSION [ need ]
Returns the version of its invocant. Checks the version if need is supplied.
These methods can be used as normal functions as well, e.g., UNIVERSAL::isa($c,Math::Complex::).
The pseudopackage CORE provides access to all Perl built-in functions, even when they have been overridden.
The pseudopackage SUPER provides access to base class methods without having to specify which class defined that method. This is meaningful only when used inside a method.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.