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The Master Rubyist

The Master Rubyist

Slide deck from my RubyC 2016 presentation.

Bozhidar Batsov

June 07, 2016
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  1. View Slide

  2. Божидар

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  3. @bbatsov

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  4. I’m back

    View Slide

  5. epic fail

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  6. View Slide

  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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  14. View Slide

  15. Tarnovo, Bulgaria

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  16. View Slide

  17. View Slide

  18. View Slide

  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

  94. View Slide

  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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  119. View Slide

  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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  142. View Slide

  143. Emacs & vim are
    forever!

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  144. View Slide

  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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  150. View Slide

  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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