Beyond Ruby (RubyConf Argentina 2011)

Beyond Ruby Konstantin Haase

La verdadera pregunta es ...

¿Quién es el mejor fútbolista?

Ampliar tus horizonte. No deje Ruby ... ... evolucionar!

¡Explora!

Por cierto ...

Vamos a empezar!

Goal: Tell you something new! no erlang, no go, no clojure no node.js

Full Object Orientation

Doesnt Ruby have that already?

OOP != OOP

"Objects are data and functionality." Your high-school teacher

"Actually I made up the term object-oriented,and I can tell you I did not have C++ in mind." Alan Kay

"OOP to me means only messaging,local retention and protection and hidingof state-process, and extreme late-binding of all things." Alan Kay

if respuesta == 42 "¡correcto!"else "equivocado"end

respuesta = 42 ifTrue: [ ¡correcto! ] ifFalse: [ equivocado ]

def true.if_true yieldenddef false.if_trueend

TrueClass.define_method(:if_true) { yield }FalseClass.define_method(:if_true) { }

class Falso def if_true; endend

x = Delegator.new({})x.is_a? Hash # => truecase xwhen Hash ...else failend

Dont treat your objects like data structures!

my_instance.properties[:foo][1,4] == "blah"my_instance.foo? "blah"

"OOP to me means only messaging,local retention and protection and hidingof state-process, and extreme late-binding of all things." Alan Kay

"A conforming processor may omit an invocation of a method of a built-in class or module for optimization purpose, and do the same calculation as the method instead. In this case, even if a program redeﬁnes themethod, the behavior of the program might notchange because the redeﬁned method might not actually be invoked." Ruby Standard (JIS X 3017)

Every built-in Ruby method could actually be a keyword.

Is Smalltalk Object Oriented?

variable/constant access is no method send self/super is no method send

Also...no implementation treats ifTrue sends to a boolean as method send constants are not late bound

Newspeakthere are only method sends there is no global state

But I want lexical scope!

Foo = 42class Bar def foo(x) Foo + x endend

Outer = 23module Wrapper Inner = 42 class Nested def result Outer + Inner end endend

Solution: clever, bidirectional dispatch

Homoiconic

"In computer programming, homoiconicity is a property of some programming languages, in which the primary representation of programs is also a data structure in aprimitive type of the language itself, from the Greek wordshomo meaning the same and icon meaning representation. This makes metaprogramming easier than in a language without this property." Wikipedia

Homoiconic Languages Lisp, Logix, Prolog, Snobol, Io, Ioke, Lego

(1 2 3)

(+ 1 2) ; 3

(setf b 23)

(car (1 2)) ; 1(cdr (1 2)) ; (2)(car (cdr (1 2))) ; 2

(setf a (setf b 23))(eval a)

(setf a (setf b 23))(setf (car (cdr (cdr a))) 42)(eval a)

Hows that useful? Macros and Partial Evaluation Language extensions from within

DeclarativeProgramming SQL, XSLT, SPARQL, Pig

Did the last slide just say SQL and XSLT? Seriously?

declarative programming can be fun Prolog, Erlang

Prolog

ruby_core(tenderlove).?- ruby_core(tenderlove).Yes?- ruby_core(X).X = tenderlove

ruby_core(tenderlove).rails_core(tenderlove).ubercore(X) :- ruby_core(X), rails_core(X).?- ubercore(X).X = tenderlove

Prolog is Lisp, kindacar([H|_], H).cdr([_|T], T).?- car([1, 2, 3], X).X = 1?- cdr([1, 2, 3], X).X = [2, 3]

Sort a listsorted([]).sorted([_]).sorted([X,Y|T]) :- X =< Y, sorted([Y|T]).sort(X,Y) :- perm(X,Y), sorted(Y).

Thanks!github.com / rkh / presentations

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Beyond Ruby (RubyConf Argentina 2011)

by Konstantin Haase on Nov 09, 2011

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