Prototype Pollution

We can compare this to languages that use class-based inheritance like Python, where the class is defined statically, then instantiated as an object. The class defines what basic functionality the object has, rather than a prototype.

Class Based Inheritance

   # Declare a class in Python.
class Dog:
  kind = 'canine'         # Class variable shared by all instances

  def __init__(self, name):
      self.name = name    # Instance variable unique to each instance

# Create two instances of this class.
d = Dog('Fido')
e = Dog('Buddy')

d.kind   # Returns 'canine' - shared by all dogs.
d.name   # Returns 'Fido'   - unique to this dog.
e.name   # Returns 'Buddy'  - unique to this dog.
 