[removed] What are .extend and .prototype used for?

Question

I am relatively new to JavaScript and keep seeing .extend and .prototype in third party libraries I am using. I thought it had to do with the Prototype javascript library, b

Answer 1

• .extends() create a class which is a child of another class.
  behind the scenes Child.prototype.__proto__ sets its value to Parent.prototype
  so methods are inherited.
  
• .prototype inherit features from one to another.
  
• .__proto__ is a getter/setter for Prototype.