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Metaprogramming Ruby
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Francisco Fernández Castaño
February 15, 2013
Programming
1
82
Metaprogramming Ruby
A short introduction to dynamic aspects of Ruby and Ruby Object model.
Francisco Fernández Castaño
February 15, 2013
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Transcript
None
Ruby • Orientado a objetos • Lenguaje dinámico • Partes
funcionales (Bloques)
Ruby es simple en apariencia, pero complejo por dentro, como
el cuerpo humano. tratando de hacer que Ruby sea natural, no simple. Yukihiro Matsumoto 'matz'
¿Pero qué es eso del “metaprogramming”?
¿Pero qué es eso del metaprogramming? Metaprogramming is the writing
of computer programs that write or manipulate other programs (or themselves) as their data. Wikipedia
None
¿Pero qué es eso del metaprogramming? • Manejo de mensajes
cuyo destino no es conocido • Capacidad de creación y modificación de clases en runtime
None
Debemos conocer el modelo de objetos de Ruby
Debemos conocer el modelo de objetos de Ruby
en ruby todo es un objeto 2.0.0-rc2 :001 > 1.class
=> Fixnum
en ruby todo se ejecuta dentro de un objeto 2.0.0-rc2
:002 > self => main 2.0.0-rc2 :003 > class MyClass 2.0.0-rc2 :004?> self 2.0.0-rc2 :005?> end => MyClass 2.0.0-rc2 :006 > self => main 2.0.0-rc2 :007 > class MyClass 2.0.0-rc2 :008?> def test 2.0.0-rc2 :009?> self 2.0.0-rc2 :010?> end 2.0.0-rc2 :011?> def self.class_method 2.0.0-rc2 :012?> self 2.0.0-rc2 :013?> end 2.0.0-rc2 :014?> end => nil 2.0.0-rc2 :015 > MyClass.new.test => #<MyClass:0x00000002397860> 2.0.0-rc2 :016 > MyClass.class_method => MyClass
MonkeyPatches 2.0.0-rc2 :017 > class String 2.0.0-rc2 :018?> def replace
2.0.0-rc2 :019?> "dont replace" 2.0.0-rc2 :020?> end 2.0.0-rc2 :021?> end => nil 2.0.0-rc2 :022 > "stast".replace => "dont replace"
Modelo de objetos de Ruby • La keyword class solo
cambia de contexto • Las clases también son objetos de la clase Class
Modelo de objetos de Ruby class MyClass def my_method() @var
= 1 end end Obj1 = MyClass.new Obj1.my_method
Modelo de objetos de Ruby
Jerarquía de Clases class Book include Printable include Document Ancestors
# => [Book, Document, Printable, Object, Kernel, BasicObject] end
Method Lookup
None
None
Conclusiones
Cosas que me he dejado fuera
Preguntas
None