Introducing Ruby, from another perspective.

1. lemme tell ya ‘bout
A PRESENTATION BY
AR VIN JENAB I
@ARVINJERUBY

2. RUBY IS A PROGRAMMING LANGUAGE

4. YUKIHIRO “MATZ” MATSUMOTO

5. YUKIHIRO “MATZ” MATSUMOTO
1995

10. “Ruby is designed to make
programmers happy.”
- Matz

11. PERL PYTHON
LISP
SMALLTALK
EIFFEL
ADA

12. HIGH LEVEL
INTERPRETED
OBJECT-ORIENTED
OPEN SOURCE
EASY TO USE

13. (ALMOST) EVERYTHING IS OBJECT IN RUBY.

14. puts “Hello World!”

15. puts “Hello World!” ;

16. puts “Hello World!” ;( )

17. puts “Hello World!” ;( )Kernel.

19. 1 + 2

20. 1 + 2
Message Passing

21. 1 + 2
1.send :+, 2
Message Passing

22. 1 + 2
1.send :+, 2
1.responds_to? :+
Message Passing

23. 1 + 2
1.send :+, 2
1.responds_to? :+
=> true
Message Passing

24. 10.times do
puts "Ruby's great!"
end

25. class Circle < Shape
attr_accessor :radius, :center
end

26. class Circle < Shape
attr_accessor :radius, :center
end
]
SUPER CLASS

27. class Circle < Shape
attr_accessor :radius, :center
end
]
SUPER CLASS
]SYMBOL

28. @instance_variable
@@class_variable
$global_variable

29. @instance_variable
@@class_variable
$global_variable

30. @instance_variable
@@class_variable
$global_variable
Conventions

31. @instance_variable
@@class_variable
$global_variable
Conventions
CamelCaseClass
snake_case_variable
MY_RUBY_CONSTANT

32. [2,4,5,8].all? { |i| i % 2 == 0 }
=> false

33. [2,4,5,8].all? do |i|
i % 2 == 0
end
=> false

34. RUBY HAS MULTIPLE IMPLEMENTATIONS
IN DIFFERENT LANGUAGES

35. MRI OPAL
RUBINIUS
MRUBY
IRONRUBY
JRUBY

36. MRI IS WRITTEN IN C

37. WHY NOT RUBY?

38. PERFORMANCE
CONCURRENCY

39. THANK YOU!