Let's Learn Ruby - Basic

http://blog.eddie.com.tw/

Transcript

1. Let’s Learn Ruby - Basic
3. Ruby Tuesday https://www.facebook.com/groups/142197385837507/ photo by othree
4. RubyConf Taiwan http://rubyconf.tw/ photo by othree
5. Rails Girls Taipei https://www.facebook.com/railsgirlstw
6. WebConf Taiwan 2014
7. 750+ attendees
8. all tickets sold out in 4 mins
9. Let’s Learn Ruby What I want?
10. Let’s Learn Ruby Problem Solving
11. Let’s Learn Ruby Active Ecosystem
12. Let’s Learn Ruby Scenario
13. Let’s Learn Ruby open source projects on Github
14. Let’s Learn Ruby History
15. Let’s Learn Ruby まつもと ゆきひろ (Matz)
16. Let’s Learn Ruby
17. Let’s Learn Ruby first released at 1995
18. Let’s Learn Ruby 2.0 released at 2013
19. Let’s Learn Ruby 2.1 released at 2013.12
20. Let’s Learn Ruby Why Ruby?
    free, open source, easy to learn
21. Let’s Learn Ruby Ruby != Rails
22. Let’s Learn Ruby Happy, and Fun
23. Let’s Learn Ruby Rubies
    CRuby(MRI), REE, mRuby, MacRuby, JRuby, IronRuby, Rubinius..etc
24. Let’s Learn Ruby Version
    1.8, 1.9, 2.0, 2.1
25. Let’s Learn Ruby Ruby 1.8 has no future
26. Let’s Learn Ruby RVM
    Ruby Version Manager https://rvm.io/
27. Let’s Learn Ruby Editors
    Vim, Emacs, Sublime Text... etc
28. Let’s Learn Ruby coding style https://github.com/styleguide/ruby
29. Let’s Learn Ruby But Ruby is Slow..?
30. Let’s Learn Ruby What can Ruby do?
31. Let’s Learn Ruby Rake
    Make, but Ruby version. Rack http://rake.rubyforge.org/
32. Let’s Learn Ruby Rack
    it’s a specification (and implementation) of a minimal abstract Ruby API that models HTTP.
    such as Sinatra, Ruby on Rails Rack http://rack.rubyforge.org/ Sinatra http://www.sinatrarb.com Ruby on Rails http://rubyonrails.org/
33. Let’s Learn Ruby developing MacOS and iOS app
34. Let’s Learn Ruby drawing, image processing, music..
35. Let’s Learn Ruby Install Ruby now!
36. Let’s Learn Ruby http://tryruby.org
37. Let’s Learn Ruby Interactive Ruby, irb
38. Let’s Learn Ruby Gem
39. Let’s Learn Ruby gem install PACKAGE_NAME
40. Let’s Learn Ruby gem env
41. Let’s Learn Ruby gem list
42. Let’s Learn Ruby Variables and Constants
43. Let’s Learn Ruby local variable
    variable
44. Let’s Learn Ruby global variable
    $variable
45. Let’s Learn Ruby instance variable
    @variable
46. Let’s Learn Ruby class variable
    @@variable
47. Let’s Learn Ruby virtual variable
    true, false, self, nil
48. Let’s Learn Ruby variable assignment
    a = 1
    x, y, z = 1, 2, 3
49. Let’s Learn Ruby Constant
    begins with a capital letter, and it can be changed
50. Let’s Learn Ruby Reserved word and Keyword
51. Let’s Learn Ruby Reserved word and Keyword
52. Let’s Learn Ruby Logic and Flow Control
53. Let’s Learn Ruby only false and nil are false
54. Let’s Learn Ruby true v.s TrueClass false v.s FalseClass nil v.s NilClass
55. Let’s Learn Ruby if..elsif..end
56. Let’s Learn Ruby unless = not if
57. Let’s Learn Ruby if modifier
58. Let’s Learn Ruby case .. when..
59. Let’s Learn Ruby BEGIN{} and END{}
60. Let’s Learn Ruby a = true ? 'a' : 'b'
61. Let’s Learn Ruby a ||= 'a'
62. Let’s Learn Ruby Comment # single line
63. Let’s Learn Ruby Comment =begin .. =end
64. Let’s Learn Ruby Loop and Iteration
65. Let’s Learn Ruby for.. in..
66. Let’s Learn Ruby while .. end
67. Let’s Learn Ruby until .. end
68. Let’s Learn Ruby until = not while
69. Let’s Learn Ruby times
70. Let’s Learn Ruby upto, downto
71. Let’s Learn Ruby each, each_with_index
72. Let’s Learn Ruby Integer http://www.ruby-doc.org/core-2.1.0/Integer.html
73. Let’s Learn Ruby Fixnum and Bignum
74. Let’s Learn Ruby 10 / 3
75. Let’s Learn Ruby String http://ruby-doc.org/core-2.1.0/String.html
76. Let’s Learn Ruby single and double quotes
77. Let’s Learn Ruby %q v.s %Q
78. Let’s Learn Ruby "%s" % "eddie"
79. Let’s Learn Ruby string interpolation
80. Let’s Learn Ruby Exercise please calculate how many “characters” and “words” of a section of a random article with Ruby.
81. Let’s Learn Ruby Exercise please convert string “abcdefg” to “gfedcba” without using String#reverse method.
82. Let’s Learn Ruby Array http://ruby-doc.org/core-2.1.0/Array.html
83. Let’s Learn Ruby Array.new v.s []
84. Let’s Learn Ruby %w
85. Let’s Learn Ruby Exercise please sort a given array [1, 3, 4, 1, 7, nil, 7], and remove nil and duplicate number.
86. Let’s Learn Ruby Exercise please covert a given array [1, 2, 3, 4, 5] to [1, 3, 5, 7, 9] with Array#map method.
87. Let’s Learn Ruby Exercise please draw 5 unique random number between 1 to 52.
88. Let’s Learn Ruby Hash http://ruby-doc.org/core-2.1.0/Hash.html
89. Let’s Learn Ruby Hash.new v.s {}
90. Let’s Learn Ruby a = { :name => 'eddie' } a = { name: 'eddie' }
91. Let’s Learn Ruby Range http://ruby-doc.org/core-2.1.0/Range.html
92. Let’s Learn Ruby (1..10) v.s (1...10)
93. Let’s Learn Ruby Exercise please calculate the sum from 1 to 100 with Range.
94. Let’s Learn Ruby Methods
95. Let’s Learn Ruby def method_name(param)
    ...
    end
96. Let’s Learn Ruby parentheses can be omitted
97. Let’s Learn Ruby ? and !
98. Let’s Learn Ruby return value
99. Let’s Learn Ruby Singleton Method
100. Let’s Learn Ruby class Cat def walk puts "I'm walking" end end ! cat = Cat.new def cat.fly puts "I can fly" end cat.fly
101. Let’s Learn Ruby Method Missing
102. Let’s Learn Ruby def method_missing(method_name) puts "method: #{method_name} is called!" end ! something_not_exists()
103. Let’s Learn Ruby Exception Handling
     begin .. rescue.. else.. ensure.. end
104. Let’s Learn Ruby def open_my_file(file_name) File.open file_name do |f| puts f.read end end begin open_my_file("block_demo.r") rescue => e puts e else puts "it's working good!" ensure puts "this must be executed, no matter what" end
105. Let’s Learn Ruby Block
106. Let’s Learn Ruby Proc
107. Let’s Learn Ruby my_square = Proc.new { | x | x ** 2 } ! # how to call a proc puts my_square.call(10) # 100 puts my_square[10] # 100 puts my_square.(10) # 100 puts my_square === 10 # 100
108. Let’s Learn Ruby lambda, ->
109. Let’s Learn Ruby my_lambda = lambda { | x | x ** 2 }
     ! # new style in 1.9 my_lambda = -> x { x ** 2 } ! # how to call a lambda? puts my_lambda.call(10) # 100 puts my_lambda[10] # 100 puts my_lambda.(10) # 100 puts my_lambda === 10 # 100
110. Let’s Learn Ruby Proc v.s lambda
111. Let’s Learn Ruby def proc_test puts "hello" my_proc = Proc.new { return 1 } my_proc.call puts "ruby" end def lambda_test puts "hello" my_lambda = lambda { return 1 } my_lambda.call puts "ruby" end
112. Let’s Learn Ruby {} v.s do..end http://blog.eddie.com.tw/2011/06/03/do-end-vs-braces/
113. Let’s Learn Ruby Yield
114. Let’s Learn Ruby Object-Oriented Programming
115. Let’s Learn Ruby everything in Ruby is an Object
116. Let’s Learn Ruby object = state+ behavior
117. Let’s Learn Ruby root class = Object root class would be BasicObject in Ruby 1.9
118. Let’s Learn Ruby class ClassName < ParentClass
     ...
     end
119. Let’s Learn Ruby Naming Convention
120. Let’s Learn Ruby initialize
121. Let’s Learn Ruby ClassName.new
122. Let’s Learn Ruby self = current object
123. Let’s Learn Ruby instance and class variable
124. Let’s Learn Ruby instance and class method
125. Let’s Learn Ruby Exercise please create a Dog class and Cat class, which are both inherited from Animal class, and implement “walk” and “eat” methods.
126. Let’s Learn Ruby public, protected and private method
127. Let’s Learn Ruby getter and setter
128. Let’s Learn Ruby attr_reader, attr_writer and attr_accessor
129. Let’s Learn Ruby Open Class
130. Let’s Learn Ruby Module
131. Let’s Learn Ruby module ModuleName
     ...
     end
132. Let’s Learn Ruby module has no inheritance
133. Let’s Learn Ruby module has no instance
134. Let’s Learn Ruby Naming Convention
135. Let’s Learn Ruby require v.s load
136. Let’s Learn Ruby Priority?
137. Let’s Learn Ruby Exercise please create a Bird class, which is also inherited from Animal class, but include a Fly module.
138. Let’s Learn Ruby Mixin
139. Let’s Learn Ruby Ruby is single inheritance
140. Let’s Learn Ruby Duck Typing
141. Let’s Learn Ruby include v.s extend
142. Let’s Learn Ruby Bundle
143. Let’s Learn Ruby Gemfile
144. Let’s Learn Ruby http://rubygems.org/
145. Let’s Learn Ruby gem "nokogiri", :git => "git://github.com/ tenderlove/nokogiri.git" gem "secret_gem", :path => "~/my_secret_path"
146. Let’s Learn Ruby bundle install
147. Let’s Learn Ruby pack your own gem!
148. Let’s Learn Ruby 1. bundle gem NEW_NAME 2. gem build NEW_NAME.gemspec 3. gem push NEW_NAME.gem http://guides.rubygems.org/make-your-own-gem/
149. Let’s Learn Ruby Exercise please try to create a Gem spec with bundle command, modify, build and push to rubygems.org.
150. Let’s Learn Ruby Rake
151. Let’s Learn Ruby desc "mail sender" task :sendmail do puts "grap mailing list from database..." sleep 3 puts "mail sending..." sleep 3 puts "done!" end
152. Let’s Learn Ruby task :goto_toliet do puts "goto toliet" end ! task :open_the_door => :goto_toliet do puts "open door" end
153. Let’s Learn Ruby TDD
154. Let’s Learn Ruby require “minitest/autorun" ! class TestMyBMI < MiniTest::Unit::TestCase def test_my_calc_bmi_is_ok assert_equal calc_bmi(175, 80), 26.12 end end ! def calc_bmi(height, weight) bmi = ( weight / (height/100.0) ** 2 ).round(2) end
155. Let’s Learn Ruby require "minitest/autorun" describe "test my bmi calculator" do it "should calc the correct bmi" do calc_bmi(175, 80).must_equal 26.12 end end def calc_bmi(height, weight) bmi = ( weight / (height/100.0) ** 2 ).round(2) end
156. Let’s Learn Ruby Ruby Koans http://rubykoans.com/
157. Let’s Learn Ruby Ruby Object Model
158. Let’s Learn Ruby At last..
159. photo by redjar
160. Let’s Learn Ruby pick up one scripting language
161. photo by Quality & Style
162. Let’s Learn Ruby @eddiekao https://www.ruby-lang.org/zh_tw/
163. Let’s Learn Ruby Ruby is fun!
164. Let’s Learn Ruby The only limitation is your imagination.
165. ⾼高⾒見⻯⿓龍 Contacts photo by Eddie Website Blog Plurk Facebook Google Plus Twitter Email Mobile http://www.eddie.com.tw http://blog.eddie.com.tw http://www.plurk.com/aquarianboy http://www.facebook.com/eddiekao http://www.eddie.com.tw/+ https://twitter.com/eddiekao eddie@digik.com.tw +886-928-617-687