2. The first met...
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3. Yukihiro Matsumoto
(matz)
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4. "I wanted a scripting language that
was more powerful than Perl, and
more object-oriented than Python.
That's why I decided to design my
own language."
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5. R ecipe
120g Lisp
100g Perl
130g P ython
g Sm alltalk
120
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6. Interpreted
Dynamic typed
Strong in meta-programming
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22. (1..100).select {|i| i % 2 == 0}
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23. def repeat(x, &block)
(1..x).each do |i|
yield(i)
end
end
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24. def repeat(x, &block)
(1..x).each do |i|
yield(i)
end
end
repeat 10 do
puts “Hello Academy!”
end
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25. def repeat(x, &block)
(1..x).each do |i|
yield(i)
end
end
repeat 10 do |iteration|
puts “#{iteration}. Hello Academy!”
end
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27. Everything is an object!
Really!
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28. 1
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29. 1.even?
=> false
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30. 5.times do
puts “I will never use PERL!”
end
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31. 1.nil?
=> false
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32. nil
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33. nil.nil?
=> true
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34. openAcademy = Class.new
thisAcademy = openAcademy.new
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35. class OpenAcademy
def initialize(year, month)
@year = year
@month = month
end
end
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36. class OpenAcademy
attr :year
def initialize(year, month)
@year = year
@month = month
end
end
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37. class OpenAcademy
attr :year
end
def year
@year
end
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38. class OpenAcademy
attr_accessor :year
end def year
@year
end
def year=(value)
@year = value
end
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39. class OpenAcademy
attr_accessor :year
end
academy = OpenAcademy.new(2011, 06)
academy.year = 2012
puts academy.year
=> 2012
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40. class OpenAcademy
attr_accessor :year
def year=(y)
@year = y.to_s
end
end
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41. class OpenAcademy
attr_accessor :year
def year=(y)
@year = y.to_s
end
academy = OpenAcademy.new(2011, 06)
end academy.year = 2012
puts academy.year
=> “2012”
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42. class Academy < Conference
end
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43. module Comperable
# mixin
end
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44. class Academy < Conference
include Comperable
def <=>(o)
myval = self.year.to_s + self.month.to_s
other = o.year.to_s + o.month.to_s
myval <=> other
end
end
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45. class Academy < Conference
include Comperable
def <=>(o)
myval = self.year.to_s + self.month.to_s
other = o.year.to_s + o.month.to_s
myval <=> other
end
end this_academy = Academy.new(2012, 6)
last_academy = Academy.new(2011, 10)
last_academy < this_academy
=> true
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47. Advanced Level
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48. 2.prim?
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49. class Fixnum
def prim?
2.upto(to_i/2).each do |i|
return false if to_i % i == 0
end
to_i > 1
end
end
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50. class Fixnum
def prim?
2.upto(to_i/2).each do |i|
return false if to_i % i == 0
end
to_i > 1
end 2.prim?
=> true
end 1.prim?
=> false
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51. class << my_object
def prim?
...
end
end
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52. academy = Mock.new
academy.stubs(:year).returns(2012)
academy.stubs(:month).returns(6)
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53. academy = Mock.new
academy.stubs(:year).returns(2012)
academy.stubs(:month).returns(6)
print academy.month
=> 6
# Test confererence registration
Conferences.register academy
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54. class Xml
def method_missing(method, *args, &block)
print "<#{method}>"
yield if block
print "</#{method}>"
end
end
doc = Xml.new
doc.head {
doc.title {
print “Academy
}
}
=> <head><title>Academy</title></head>
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55. class User
%w(name email password).each do |method|
define_method(method) do
@data[method.to_sym]
end
end
end
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56. object.methods
object.respond_to? :method
alias :from, :to
class_eval
module_eval
Module.included(base)
...
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57. Dave Thomas - Programming Ruby
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58. ?
twitter.com/nucc
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