Polymorphism allows us to execute different implementations for the same function or method.
Polymorphism helps with code reusability as it enables the use of the same interface for a variety of different implementations.
In Ruby, we can utilize polymorphism through inheritance to ensure that the same method defined in a parent class will have different implementations and outputs once a child classes call it.
class Element # parent class def symbol puts "this method returns the symbol of the element" end end class Sodium < Element def symbol # override the parent method puts "symbol for Sodium: Na" end end class Copper < Element def symbol # override the parent method puts "symbol for Copper: Cu" end end element = Sodium.new element.symbol element = Copper.new element.symbol
Line 22 and
Line 26 show the same method being called for different child classes. The output shows that the implementations specific to the child class in question were called. The implementation provided by the parent class for the
symbol method was overwritten.
Depending on the object the
element variable is referencing, the implementation that belongs to that object will be executed.