Beyond Ruby

My slides from Rails Israel 2012

Transcript

1. @konstantinhaase github.com/rkh Beyond Ruby Exploring New Territories
2. @konstantinhaase github.com/rkh Konstantin Haase Open Source Developer
3. @konstantinhaase github.com/rkh
4. @konstantinhaase github.com/rkh “Second to K&R, the most lagom technical book I’ve read.” Peter Cooper (Ruby Inside) Discount Code: AUTHD 50% off ebook ($6.50) 40% off print
5. @konstantinhaase github.com/rkh
6. @konstantinhaase github.com/rkh A Programming Language is just a Tool
7. @konstantinhaase github.com/rkh Tell you something new
8. @konstantinhaase github.com/rkh No Node.js No Erlang No Go
9. @konstantinhaase github.com/rkh Full Object Orientation
10. @konstantinhaase github.com/rkh Doesn’t Ruby already have that?
11. @konstantinhaase github.com/rkh OOP ≠ OOP
12. @konstantinhaase github.com/rkh “Objects are data and functionality” Your High School Teacher
13. @konstantinhaase github.com/rkh
14. @konstantinhaase github.com/rkh “I made up the term object-oriented, and I can tell you, I did not have C++ in mind.” Alan Kay
15. @konstantinhaase github.com/rkh “ OOP to me means only messaging, local retention and protection and hiding of state-process, and extreme late-binding of all things.” Alan Kay
16. @konstantinhaase github.com/rkh Smalltalk
17. @konstantinhaase github.com/rkh if response == 42 "correct!" else "wrong" end
18. @konstantinhaase github.com/rkh response = 42 ifTrue: [ 'correct!' ] ifFalse: [ 'wrong' ]
19. @konstantinhaase github.com/rkh def true.if_true yield end def false.if_true end
20. @konstantinhaase github.com/rkh TrueClass. define_method(:if_true){ yield } FalseClass. define_method(:if_true) { }
21. @konstantinhaase github.com/rkh class Falsy def if_true; end end
22. @konstantinhaase github.com/rkh x = Delegator.new({}) x.is_a? Hash # => true case x when Hash then ... else fail end
23. @konstantinhaase github.com/rkh Do not treat Objects like Data Structures!
24. @konstantinhaase github.com/rkh my_instance. properties[:foo][1,4] == "blah" my_instance.foo? "blah"
25. @konstantinhaase github.com/rkh Is Smalltalk Object Oriented?
26. @konstantinhaase github.com/rkh variable/constant access is no method send keywords like self and super are no method sends
27. @konstantinhaase github.com/rkh no implementation treats ifTrue: and ifFalse: as method sends constants are not late bound
28. @konstantinhaase github.com/rkh Newspeak
29. @konstantinhaase github.com/rkh there are only method sends there is no global state
30. @konstantinhaase github.com/rkh But I want lexical scope!
31. @konstantinhaase github.com/rkh Foo = 42 class Bar def foo(x) Foo + x end end
32. @konstantinhaase github.com/rkh Outer = 23 module Wrapper Inner = 42 class Nested def result Outer + Inner end end end
33. @konstantinhaase github.com/rkh Solution: Clever, Bi- Directional Dispatch
34. @konstantinhaase github.com/rkh
35. @konstantinhaase github.com/rkh
36. @konstantinhaase github.com/rkh Homoiconic Languages
37. @konstantinhaase github.com/rkh "In computer programming, homoiconicity is a property of some programming languages, in which the primary representation of programs is also a data structure in a primitive type of the language itself, from the Greek words homo meaning the same and icon meaning representation. This makes metaprogramming easier than in a language without this property." Wikipedia
38. @konstantinhaase github.com/rkh Lisp, Logix, Io Prolog, Snobol, Ioke
39. @konstantinhaase github.com/rkh
40. @konstantinhaase github.com/rkh '(1 2 3)
41. @konstantinhaase github.com/rkh (+ 1 2) ; 3
42. @konstantinhaase github.com/rkh (setf b 23)
43. @konstantinhaase github.com/rkh (car '(1 2)) ; 1 (cdr '(1 2)) ; '(2)
44. @konstantinhaase github.com/rkh (car (cdr '(1 2)))
45. @konstantinhaase github.com/rkh (setf a '(setf b 23)) (eval a)
46. @konstantinhaase github.com/rkh (setf a '(setf b 23)) (setf (car (cdr (cdr a))) 42) (eval a)
47. @konstantinhaase github.com/rkh
48. @konstantinhaase github.com/rkh How’s that useful?
49. @konstantinhaase github.com/rkh Macros and Partial Evaluation Language Extensions from within
50. @konstantinhaase github.com/rkh Declarative Programming
51. @konstantinhaase github.com/rkh SQL, XSLT, SPARQL, Pig Prolog, Erlang
52. @konstantinhaase github.com/rkh
53. @konstantinhaase github.com/rkh
54. @konstantinhaase github.com/rkh ruby_core(tenderlove). ?- ruby_core(tenderlove). Yes ?- ruby_core(X). X = tenderlove
55. @konstantinhaase github.com/rkh ruby_core(tenderlove). rails_core(tenderlove). ubercore(X) :- ruby_core(X), rails_core(X). ?- ubercore(X). X = tenderlove
56. @konstantinhaase github.com/rkh car([H|_], H). cdr([_|T], T). ?- car([1, 2, 3], X). X = 1 ?- cdr([1, 2, 3], X). X = [2, 3]
57. @konstantinhaase github.com/rkh sorted([]). sorted([_]). sorted([X,Y|T]) :- X =< Y, sorted([Y|T]). sort(X,Y) :- perm(X,Y), sorted(Y).
58. @konstantinhaase github.com/rkh Hardware Programming
59. @konstantinhaase github.com/rkh VHDL Very-high-speed integrated circuits Hardware Description Language
60. @konstantinhaase github.com/rkh FOO <= '1'; BAR <= '0'; BAZ <= FOO and BAR;
61. @konstantinhaase github.com/rkh github.com/a-team/Pong
62. @konstantinhaase github.com/rkh
63. @konstantinhaase github.com/rkh Thank you!