Introduction to Ruby Programming Language

Created for For SARCCOM Indonesia meetup

Transcript

1. Ruby Programming Language
   

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2. Didik Wicaksono
   CTO Cookpad Indonesia
   

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3. Github: firewalker06
   Twitter: did1k
   

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4. I work in
   

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5. Its where I learn to program with
   Ruby
   

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6. The question is:
   Why Ruby?
   

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7. Meet Matz
   

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8. He invented Ruby in 1995
   

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9. He designed Ruby to be
   human-oriented
   

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10. Ruby syntax is designed to
    be elegant
    

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11. print "elephant" if "elephant".include? "ant"
    "elephant"
    

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12. print "elephant" if "elephant".include? "ant"
    You can speak this in proper english:
    “Print an elephant if elephant include ant”
    

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13. print "elephant" if "elephant".include? "ant"
    You can speak this in proper english:
    “Print elephant if elephant include ant”
    

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14. print "elephant" if "elephant".include? "ant"
    You can speak this in proper english:
    “Print elephant if elephant include ant”
    

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15. This sentence still doesn’t make any sense,
    but it is readable
    You can speak this in proper english:
    “Print elephant if elephant include ant”
    print "elephant" if "elephant".include? "ant"
    

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16. print "elephant" if "elephant".include? "ant"
    “if” can be used to modify expression
    

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17. print "elephant" if "elephant".include? "ant"
    “if” can be used to modify expression
    Method name can have question mark
    

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18. Writing Ruby code is easy
    because it can be written in
    plain english
    

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19. Programmer can express
    themselves into their code
    

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20. movie.awesome?
    bedroom.with_twin_beds?
    recipe.cooked_under 10.minutes
    Programmer can express
    themselves into their code
    

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21. humans.obliterate!
    

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22. humans.obliterate! unless humans.nice?
    

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23. There are more than one way
    to do anything in Ruby
    

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24. false
    2.negative?
    2 < 0
    

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25. "hello"
    puts "hello"
    $stdout.puts "hello"
    p "hello"
    

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26. one = 1
    two = 2
    three = 3
    one, two, three = [1, 2, 3]
    

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27. one = 1
    two = 2
    three = 3
    one, two, three = [1, 2, 3]
    one, two, three = 1, 2, 3
    You don’t even need
    

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28. [1, 2, 3, 4, 5].map { |element|
    element if element.even?
    }.compact
    [2,4]
    

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29. [1, 2, 3, 4, 5].
    select { |element| element.even? }
    [2,4]
    

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30. [1, 2, 3, 4, 5].select(&:even?)
    [2,4]
    

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31. Block arguments also
    makes Ruby popular
    

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32. method do
    ...
    end
    method do |argument|
    ...
    end
    

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33. %w(Google Yahoo MSN).map do |engine|
    "https://www.#{engine.downcase}.com"
    end
    ["https://www.google.com",
    "https://www.yahoo.com",
    "https://www.msn.com"]
    

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34. Blocks allows us to attach closure to
    any method
    %w(Google Yahoo MSN).map do |engine|
    "https://www.#{engine.downcase}.com"
    end
    this will be returned
    

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35. Blocks allows us to attach closure to
    any method
    %w(Google Yahoo MSN).map do |engine|
    "https://www.#{engine.downcase}.com"
    end
    this will be returned
    You don’t even need to write return
    

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36. Almost forgot!
    %w(Google Yahoo MSN).map do |engine|
    "https://www.#{engine.downcase}.com"
    end
    Is equal: ["Google", "Yahoo", "MSN"]
    

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37. More Blocks
    

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38. %w(jakarta bandung).map do |city|
    city.capitalize
    end
    

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39. %w(jakarta bandung).map do |city|
    city.capitalize
    end
    ["Jakarta", "Bandung"]
    

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40. %w(jakarta bandung).map(&:capitalize)
    ["Jakarta", "Bandung"]
    

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41. [
    ["jakarta", "province"],
    ["bandung", "city"]
    ].each do |name, type|
    puts "#{name}_#{type}"
    end
    

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42. "jakarta_province"
    "bandung_city"
    [
    ["jakarta", "province"],
    ["bandung", "city"]
    ].each do |name, type|
    puts "#{name}_#{type}"
    end
    

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43. This kind of flexibility
    improves the joy of
    programming
    

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44. You might notice that Ruby
    makes you write fewer
    codes
    

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45. one = 1
    two = 2
    three = 3
    one, two, three = [1, 2, 3]
    one, two, three = 1, 2, 3
    You don’t even need
    FLASHBACK!
    

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46. [1, 2, 3, 4, 5].select(&:even?)
    [2,4]
    FLASHBACK!
    

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47. Who doesn’t want to write
    less?
    

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48. Have you tried
    programming with Ruby?
    

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49. You might not noticed, but Mac users
    already have Ruby
    (even though its outdated)
    Installation is pretty easy:
    https://www.ruby-lang.org/en/docum
    entation/installation/
    

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50. It only takes 20 minutes to learn
    Ruby from this page:
    https://www.ruby-lang.org/en/docu
    mentation/quickstart/
    

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51. There is also tutorials in Bahasa
    Indonesia:
    https://www.idrails.com/
    

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52. How about you try to learn
    together with fellow
    Rubyists?
    

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53. Ruby community is
    known to be friendly
    (nice)
    

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54. MINASWAN
    (Matz is nice and so we are nice)
    みなさん (read: mina-san)
    translation: everyone (polite)
    

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55. MINASWAN
    (Matz is nice and so we are nice)
    みなさん (read: mina-san)
    translation: everyone (polite)
    

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56. Friday Hug
    

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59. In Indonesia, we are known as
    ID-Ruby
    We are active on Slack and Telegram
    

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60. In Indonesia, we are known as
    ID-Ruby
    We are active on Slack and Telegram
    Feel free to join: http://ruby.id/slack
    and https://t.me/ruby_id
    

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61. We held meetups regularly
    

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62. We held meetups regularly
    

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63. Ruby ecosystem is huge
    

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64. More than 135,000 gems in
    rubygems.org
    

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65. “Gems” are what we called
    as Ruby libraries
    

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66. One of the most popular gem is
    Ruby on Rails framework
    

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67. It is said that Rails made Ruby
    gaining popularity in 2006
    

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68. Its over 10 years, but Rails is still on
    demand!
    https://infinum.co/the-capsized-eight/analyzing-rubygems-stats-v2016
    

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69. Big companies that uses Ruby
    

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70. ● Github
    ● Heroku
    ● Airbnb
    ● Shopify
    

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71. How about in
    Indonesia?
    

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72. ● Bukalapak
    ● Go-Jek
    ● Midtrans
    ● Vidio
    

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73. Now you know!
    

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74. List of Ruby companies in
    Indonesia can be seen in
    ID-Ruby homepage!
    

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76. Feel free to browse http://ruby.id !
    

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77. How about?
    

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78. Started using Rails on ver
    1.2.3 with Ruby 1.8.7
    

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79. Current Rails version is 5.1 with
    Ruby 2.4
    Started using Rails on ver
    1.2.3 with Ruby 1.8.7 (2009!)
    

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80. Previously we used ColdFusion
    

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81. We have several large Rails
    applications running in Cookpad!
    

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82. Our app servers run less than
    100ms
    

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83. If you are interested
    https://speakerdeck.com/mirakui/high-performance-rails-long-edition
    

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84. If you are interested
    https://speakerdeck.com/a_matsuda/the-recip
    e-for-the-worlds-largest-rails-monolith
    

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85. You can still be productive and
    run fast web application with
    Ruby on Rails
    

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