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Methods

        
Prompto supports both global methods and category methods.
        
In this section, we describe category methods only, global methods are described in the Methods section.
        

        
Category and global methods have a lot in common, so most of the information is the same for both type of methods, and may seem redundant.
        
There are however some differences:
            

                
The current object i.e. this or self:
                    
Category methods are executed in the context of a category instance. This instance can be addressed using the this  or self keyword.
                    
The current object is implicit, there is no need to pass it as a parameter.
                
                
Method overriding:
                    
Derived categories inherit the methods defined in their parents. Prompto supports re-defining these methods in derived categories. This is called method overriding.
                
                
Abstract methods:
                    
Abstract methods are only supported by abstract categories. Concrete derived categories must provide an implementation of inherited abstract methods.