CSC/ECE 517 Summer 2008/wiki1 8 dm
Prototype-based Programming
In Lecture 7, we consider prototype-based programming in Ruby. The example that is given is some what artificial. Can you identify real tasks that are easier with prototype-based programming than with class-based programming? Give the code, at least in outline.
After researching this matter, I hit on the idea of using prototype-based programming to handle linked lists. Since the nodes would need to handle different objects, the first node implemented would serve as a prototype for nodes that contain different attributes or more complicated logic. Any container or pointer class that has to deal with a number of functions, you can either use the same
Ex.
|class LinkNode
| attr_reader :name, :next, :value
|
| def initialize(name, next,value)
| @name, @next, @value = name, next, value
| end
|
| def getNext
| next
| end
|end
|
|node1 = LinkNode.new('Dave',nul,nul)
|node2 = LinkNode.new('John,nul,nul)
|
|module StringNode
| def isEmptyString?
| if value == nul
| true
| else
| false
| end
|end
|
|node1.extend(StringNode)