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Learn how to add class variables that can be used by all the objects created from a class definition, and class methods that can be run without having to create an instance of a class. In this video, Huw Collingbourne explains the syntax of class methods and variables and gives examples of how to use them in your own code.
Sometimes it’s useful to store information on a set of related objects. For example, you might need to maintain a count of the objects created from a specific class. A good way of doing this would be to create a class variable. You can also create class methods which can be called without having to create an object first. The Ruby class library has a number of classes that are rich in class methods so it is worth knowing how these differ from ‘instance methods’. This is explained in this video.