ChrisPine_UROM.ppt
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The document discusses Ruby's object model and relationships between different types of objects. It explains that all objects in Ruby inherit from the Object class and have a class. Classes are also objects that have a class of Class. The document provides examples of using kind_of? to check an object's type and defines relationships between core classes like Integer, Fixnum and String. It illustrates how modules can be included to add methods and explains singleton classes for objects and classes.
ChrisPine_UROM.ppt
- 1. Understanding Ruby’s Object Model Chris Pine July 10, 2003
- 2. Some Ruby Basics 1234567.class Fixnum ' hello ' .class String
- 3. Some Ruby Basics 1234567.class Fixnum ' hello ' .class String Fixnum.superclass Integer String.superclass Object
- 4. Some Ruby Basics 1234567.class Fixnum ' hello ' .class String Fixnum.superclass Integer String.superclass Object ' hello ' .kind_of?(String) true 1234567.kind_of?(Integer) true 1234567.kind_of?(String) false
- 5. A Little Quiz Object.kind_of?(Object) ?
- 6. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) ?
- 7. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) true Class.kind_of?(Object) ?
- 8. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) true Class.kind_of?(Object) true Class.kind_of?(Class) ?
- 9. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) true Class.kind_of?(Object) true Class.kind_of?(Class) true ' hey ' .kind_of?(String) ?
- 10. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) true Class.kind_of?(Object) true Class.kind_of?(Class) true ' hey ' .kind_of?(String) true String.kind_of?(Class) ?
- 11. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) true Class.kind_of?(Object) true Class.kind_of?(Class) true ' hey ' .kind_of?(String) true String.kind_of?(Class) true Fixnum.kind_of?(Integer) ?
- 12. A Little Quiz Object.kind_of?(Object) true Object.kind_of?(Class) true Class.kind_of?(Object) true Class.kind_of?(Class) true ' hey ' .kind_of?(String) true String.kind_of?(Class) true Fixnum.kind_of?(Integer) false
- 13. Wrong Mental Picture Object class Classes Subclasses objects
- 14. What We Know… aClass.superclass.superclass… Object Object.superclass nil
- 15. What We Know… aClass.superclass.superclass… Object Object.superclass nil anObject.class.class… Class Class.class Class
- 16. What We Know… aClass.superclass.superclass… Object Object.superclass nil anObject.class.class… Class Class.class Class aClass.class Class anObject.class.class Class
- 17. Superclass Relationships Object Module Class String Integer Fixnum
- 18. Class Relationships Object Module String Integer Fixnum 5 ' hi ' Class
- 19. Relationships anObject.class aClass.superclass anObject.kind_of? *
- 20. Right Mental Picture Object Module Class String Integer Fixnum 5 ' hi '
- 21. Modules module FooMod class String def foo include FooMod ' BIGFOO! ' end end end Object Proxy: FooMod foo String reverse split …
- 22. Singleton Classes (objects) me = ' Chris ' def me.wife ' Katy ' end String 'Chris'(S) ' Chris ' reverse split … wife
- 23. Singleton Classes (classes) poly = Polygon.new poly.area 12.823 Polygon.largest poly tri = Triangle.new tri.area 9.816 tri.hypotenuse 7.244 Triangle.largest tri
- 24. Singleton Classes (classes) Polygon Triangle hypotenuse area largest new Class Polygon(S) ? ? ? ?
- 25. Polygon Triangle hypotenuse area largest new Class Poly(S) Tri(S) Object Obj(S) Class(S) Mod(S) Module