The Master Rubyist

Slide deck from my RubyC 2016 presentation.

Transcript

1. View Slide

2. Божидар
   

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3. @bbatsov
   

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4. I’m back
   

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5. epic fail
   

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7. Hakuna Matata,
   what a wonderful phrase
   Hakuna Matata,
   ain't no passing craze
   It means no worries for the rest
   of your days
   It's our problem free philosophy,
   Hakuna Matata
   

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8. They call me
   Master…
   

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9. … and I’m a Rubyist
   

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10. I must be
    The Master Rubyist!
    

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11. View Slide

12. Sofia, Bulgaria
    

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13. Sofia, Bulgaria
    

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15. Tarnovo, Bulgaria
    

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19. Dashingly handsome
    

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20. Sings like an angel
    

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21. Loves karaoke
    

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22. Is very responsible
    

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23. Was very responsible
    last night
    

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24. Loves beer
    

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25. Loves scotch
    

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26. Loves vodka
    

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27. Terrified by gorilka
    

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28. Loves Ruby
    

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29. Loves Ruby
    

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30. Loves Ruby
    

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31. Loves Ruby
    

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32. Uses tabs instead of
    spaces
    

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33. Uses vim
    

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34. View Slide

35. Emacs fanatic
    

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36. Star Wars fanatic
    

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37. Batman
    

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38. View Slide

39. Loves OSS
    

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40. Does some OSS
    development
    

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41. View Slide

42. On the core team of
    some projects
    

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43. Works for a famous
    company
    

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44. View Slide

45. Loved by his team
    

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46. View Slide

47. Loved by his team
    

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48. The Master
    Rubyist
    D[$Q\JKFCT$CVUQX
    

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49. Master
    

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50. having or showing
    very great skill or
    proficiency
    

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51. View Slide

52. Novice
    

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53. a person new to and
    inexperienced in a job
    or situation
    

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54. View Slide

55. Journeyman
    

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56. a worker, performer, or
    athlete who is experienced
    and good but not excellent
    

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57. View Slide

58. The Road to Mastery
    

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59. View Slide

60. not really
    

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61. try 10
    years
    

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62. http://norvig.com/21-
    days.html
    Teach Yourself
    Programming in Ten Years
    Peter Norvig
    

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63. Apprenticeship
    

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64. Novice
    Journeyman
    Master
    Apprenticeship
    Apprenticeship
    

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65. Object-oriented
    programming
    

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66. View Slide

67. Ruby is a purely object-
    oriented language
    

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68. View Slide

69. View Slide

70. Know Thy Language!
    

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71. Crazy People
    

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72. View Slide

73. Ruby is a VERY
    COMPLEX language!
    

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74. class instance
    variable
    

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75. protected
    

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76. module_function
    vs
    extend self
    

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77. refinements
    

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78. super vs super()
    

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79. ==
    ===
    equal?
    eql?
    

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80. View Slide

81. View Slide

82. Grokking the language
    

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83. Understanding and
    appreciating its
    philosophy
    

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84. Coming to grips with
    reality
    

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85. (no language is
    perfect)
    

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86. (not even Clojure)
    

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87. (some languages
    really suck)
    

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88. Master the idioms
    

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89. for i in 1..3
    puts "Hello, Kiev!"
    end
    

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90. 3.times do
    puts "Hello, Kiev!"
    end
    

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91. if some_condition then
    # body omitted
    end
    

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92. def some_method
    # ...
    return result
    end
    

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93. View Slide

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95. View Slide

96. Read some (good)
    code
    

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97. some == A LOT
    

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98. View Slide

99. Obtain a notion of style
    

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100. A style guide
     • a curated set of (supposedly) good
     practices
     • spares you the process of making
     trivial decisions
     • allows you to focus on the actual
     problems
     • simple and concise
     

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101. View Slide

102. Use the active voice.
     

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103. My first visit to Kiev
     will always be
     remembered by me.
     lame
     

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104. I shall always
     remember my first
     visit to Kiev.
     legit
     

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105. The word personally
     is often unnecessary.
     

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106. Personally, I love
     RubyC.
     

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107. Style guides aren’t a
     replacement for thinking
     

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108. View Slide

109. Write clearly -- don't
     be too clever.
     

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110. def user_signed_in?
     !!@current_user
     end
     def user_signed_in?
     !@current_user.nil?
     end
     

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111. Don't sacrifice clarity
     for small gains in
     efficiency.
     

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112. i = 1
     res = 0
     while i <= 10
     res += i
     i += 1
     end
     

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113. (1..10).reduce(:+)
     

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114. (N * (N + 1)) / 2
     

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115. (10 * (10 + 1)) / 2
     

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116. Ruby Style Guide
     https://github.com/bbatsov/ruby-style-guide
     

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117. View Slide

118. Tackle problems with
     style
     

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120. puts debugging
     sucks
     

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121. bla bla bla
     puts ‘********’
     puts x
     puts ‘********’
     

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122. View Slide

123. pro “puts” debugging
     techniques
     

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124. object = Object.new
     puts
     object.method(:blank?).source_location
     # => ["/gems/
     activesupport-5.0.0.beta1/lib/
     active_support/core_ext/object/
     blank.rb", 14]
     

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125. class Bar
     def foo
     puts "====================="
     puts caller
     end
     end
     

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126. def foo
     puts method(:foo).super_method.source_location
     super
     end
     

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127. def parse(input, skip_code_comments: false,
     ignore_whitespace: true)
     # do stuff
     end
     method(:parse).parameters
     #=> [[:req, :input], [:key, :skip_code_comments],
     [:key, :ignore_whitespace]]
     

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128. config.thing = { "foo" => "bar" }
     config.thing.freeze = { "foo" => "bar" }
     config.thing.delete("foo")
     # active_support/concurrency/share_lock.rb:151:in
     `delete': can't modify frozen Hash (RuntimeError)
     # from active_support/concurrency/share_lock.rb:151:in
     `yield_shares'
     # from active_support/concurrency/share_lock.rb:79:in
     `block in stop_exclusive'
     

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129. Ruby Debugging Magic
     Cheat Sheet
     http://www.schneems.com/2016/01/25/ruby-debugging-
     magic-cheat-sheet.html
     

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130. I am a puts debugger
     https://tenderlovemaking.com/2016/02/05/i-am-a-puts-
     debuggerer.html
     

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131. I am not a puts
     debugger!
     

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132. byebug
     https://github.com/deivid-rodriguez/byebug
     

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133. pry-byebug
     https://github.com/deivid-rodriguez/pry-byebug
     

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134. Profiling stuff
     

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135. ruby-prof
     https://github.com/ruby-prof/ruby-prof
     

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136. memory_profiler
     https://github.com/SamSaffron/memory_profiler
     

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137. The Editors
     

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138. Emacs
     

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139. vim
     

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140. Spacemacs
     

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141. What about the rest?
     

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143. Emacs & vim are
     forever!
     

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145. View Slide

146. Interactive
     programming
     

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147. The REPL is king!
     

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148. pry > irb
     

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149. Rails
     

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151. Beyond Rails
     

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152. Opal
     

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153. RubyMotion
     

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154. System
     administration
     

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155. JRuby
     

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156. Alternative web
     frameworks
     

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157. Volt
     

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158. Hanami
     

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159. Padrino
     

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160. Sinatra
     

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161. Roda
     

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162. Keep in sync
     

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163. RubyWeekly
     

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164. Ruby5
     

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165. RubyRogues
     

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166. RubyTapas
     

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167. GoRails
     

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168. RubyConf
     

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169. RailsConf
     

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170. Always be exploring!
     

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171. Clojure
     

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172. Haskell
     

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173. Elm
     

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174. Erlang/Elixir
     

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175. Racket
     

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176. Ideas from other programming
     languages make us better
     programmers
     

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177. One more thing…
     

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178. Ruby is simply not a good
     fit
     for every possible problem
     

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179. View Slide

180. View Slide

181. Felina
     

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