1. Messages from Perl
id:aereal

2. id:aereal[誰?]
aereal
aereal
aereal

5. Ruby
Perl
JavaScript

6. I/O

7. I/O

8. Io
http://iolanguage.com/

9. ActionScript C++ PHP
ALGOL Fortran COBOL
Java C# Objective-C
Pascal Haskell Prolog
Modula-2 Brainfxxk R
Scala Groovy Lua ML
Smalltalk OCaml Go

10. $a <=> $b

11. Object-oriented
Programming

12. OOP?
messaging
polymorphism
encapsulation

13. Implementations
Simple
Expensive

14. Expensive impl. (1)
First-class class and objects
Coupling tightly

15. Expensive impl. (2)
Ruby
Java

16. class Car
# ...
end

17. Simple impl. (1)
Use Dictionary-like data structure
Coupling loosely

18. Simple impl. (2)
JavaScript
Perl

19. package Car;
sub new {
my ($class) = @_;
bless +{}, $class;
}
1;

20. Dynamic dispatch

21. Perl

22. package Car;
sub run {
my ($self) = @_;
print “runn”;
}

23. my $car = Car->new;
run $car;

24. Indirect object syntax

25. Implicitly take arguments
Perl
Python

26. Ruby

27. class Car
def run
puts “run”
end
end

28. car = Car.new
car.send(“run”)

29. run = car.method(“run”)
run.call

30. Method#.*
#receiver -> object
#owner -> class

31. Method instances know receiver

32. Conclusions
Many ‘Objects’
Implementations are constraints
You should be multi-lingual

33. おしまい