30 slides en 30 minutes

Présentation sur Ruby @ ConFoo2016

Transcript

1. 30 SLIDES EN 30 MINUTES CONFOO 2016
2. TOUT LE MONDE CONNAIT GIT LOG, OUI? Linus GIT
3. commit 6f7dea9 + patate = Patate.new(1) commit 850aecb + patate = Patate.new(2) - patate = Patate.new(1) commit a73bf19 + banane = Banane.new(3) $ git log > 6f7dea9 > 850aecb > a73bf19
4. commit 6f7dea9 + patate = Patate.new(1) commit 850aecb + patate = Patate.new(2) - patate = Patate.new(1) commit a73bf19 + banane = Banane.new(3) $ git log -G”patate” > 6f7dea9 > 850aecb
5. commit 6f7dea9 + patate = Patate.new(1) commit 850aecb + patate = Patate.new(2) - patate = Patate.new(1) commit a73bf19 + banane = Banane.new(3) $ git log -S”patate” > 6f7dea9
6. CONNAISSEZ-VOUS STRING#SPLIT? VRAIMENT? Christian Blais RUBY
7. $ “fox”.split(“o”) > [“f”, “x”]
8. $ “fox”.split(“f”) > [“”, “ox”]
9. $ “fox”.split(“x”) > [“fo”]
10. QU’EST-CE QUI VIENT APRÈS ARRAY#FIRST? Tenderlove RAILS
11. $ x = Array.new(100) $ x.first; x.last $ x.second $ x.third $ x.fourth $ x.fifth $ x.forty_two
12. $ Post.where(…).forty_two > nil
13. $ Post.where(…).forty_two! > RecordNotFound
14. TOUJOURS SUR MYSQL, HEY? PostgreSQL BASE DE DONNÉES
15. $ p = Post.create do |post| $ post.title = “x” * 200 $ end > <Post id=“1”> $ p.title.size > 100
16. $ p = Post.create(title: nil) > MySQL::Error $ p = Post.create(title: “x”) > <Post id=“1”>
17. $ p.update(title: nil) > <Post id=“1”> $ p.title > nil
18. JSON PRETTY PRINT Christian Blais PYTHON
19. $ curl http://adele.com/hello.json > {"hello1":"it is me”,”hello2": "from the other side”, ”hello3":"from the outside"}
20. python -mjson.tool $ !! | python -mjson.tool > { "hello1": "it is me", "hello2": "from the other side", "hello3": "from the outside" }
21. FAISONS UN PEU D’ÉTYMOLOGIE, MMKKÉ? Personne RAILS
22. grep -roh ABC . | wc -w
23. ‣ 23 unicorns ‣ 9 ahoy ‣ 9 suck ‣ 6 wtf ‣ 3 ninja ‣ 2 python ‣ 1 shit
24. 2337 pirates
25. class Pirate < ActiveRecord::Base belongs_to :parrot, :validate => true has_many :treasures, :as => :looter has_many :treasure_estimates has_one :ship has_many :birds, -> { order('birds.id ASC') } … end
26. ## # Call this at the top of your tests when you absolutely # positively need to have ordered tests. In doing so, you're # admitting that you suck and your tests are weak. def self.i_suck_and_my_tests_are_order_dependent! class << self undef_method :test_order if method_defined? :test_order define_method :test_order do :alpha end end end
27. DIVISONS PAR ZÉRO Ton prof de math FAIT DIVERS
28. $ 0/0 > ZeroDivisionError
29. $ 0.0/0 > NaN
30. $ Float::NAN > NaN
31. $ Float::NAN == Float::NAN > false
32. $ [Float::NAN] == [Float::NAN] > true
33. $ Float::NAN < 1.1 $ Float::NAN > 1.1 $ Float::NAN == 1.1 > false > false > false
34. $ [Float::NAN, 1.1].min > ArgumentError: comparison of float with float failed
35. PARLANT DE ZÉRO… Un autre prof de math ALIAS
36. $ 0.zero? $ 1.0.zero? > true > false
37. $ 0.nonzero? $ 1.nonzero? > nil > 1
38. BUNDLE EXEC RAGE QUIT Un collègue ALIAS
39. $ rails server > Bundler can’t satisfy… $ bundle exec rails server > Run `bundle install` to… $ bundle install > Your bundle is complete! $ bundle exec rails server > Listening on 0.0.0.0:3000
40. $ bundle check > All good champion $ bundle check > Not good, please install
41. alias be = bundle check || bundle install && bundle exec $ be rails server > Dependencies are satisfied > Listening on 0.0.0.0:3000
42. TRIPLE ÉGALITÉ Christian Blais RUBY
43. Proc#=== Invoque le Proc avec obj comme paramètre
44. case x when ->(n) { n.even? } then :even when ->(n) { n.odd? } then :odd else :wtf end
45. def code?(code) ->(resp) { resp.code == code } end case response when code?(200) then “Yeah!” when code?(400) then “Uhoh!” when code?(500) then “Shit!” else “I’m a teapot” end
46. PARLONS DE HASH… Un drogué RUBY
47. a = { ‘a’ => ‘A’ } a.map do |key, value| key.upcase! end
48. RuntimeError can't modify frozen String
49. store(key, value) Associates the value given by value with the key given by key. key should not have its value changed while it is in use as a key (a String passed as a key will be duplicated and frozen).
50. MÉTHODES NON LIÉES Google Translation pour “UnboundMethod” RUBY
51. class A def foo(a, *b, &block) end end $ method = A.instance_method(:foo) > #<UnboundMethod: A#foo>
52. Method#owner $ method = A.instance_method(:foo) > #<UnboundMethod: A#foo> $ method.owner > A
53. Method#bind $ method = A.instance_method(:foo) > #<UnboundMethod: A#foo> $ method.bind(B.new) > bind argument must be an instance of B
54. Method#parameters $ method = A.instance_method(:foo) > #<UnboundMethod: A#foo> $ method.parameters > [[:req, :a], [:rest, :b], [:block, :block]]
55. Method#arity $ method = A.instance_method(:foo) > #<UnboundMethod: A#foo> $ method.arity > -2
56. Method#source_location $ method = A.instance_method(:foo) > #<UnboundMethod: A#foo> $ method.source_location > ["(irb)", 17]
57. 㽈 SAY MY NAME 㽈 Destiny’s Child RUBY
58. __method__, __callee__ def hello puts __method__ puts __callee__ end alias_method :adele, :hello $ adele > :hello > :adele
59. BREAK, NEXT, REDO, RETURN Courageux Rubyiste RUBY
60. break $ [1,2,3].map { |x| break } > nil $ [1,2,3].map { |x| break(x) } > 1
61. next $ [1,2,3].map { |x| next } > [nil, nil, nil] $ [1,2,3].map { |x| next(x) } > [1, 2, 3]
62. redo $ [1,2,3].map { |x| redo } >
63. return $ [1,2,3].map { |x| return } > LocalJumpError: unexpected return
64. RETOUR VERS LE FUTUR Christian Blais RUBY
65. cd -
66. git checkout -
67. À GO, ON CREUSE! N’importe qui, on s’en fou RUBY
68. { hello: { from: { the: “Outside” } } }
69. $ data[:hello][:from][:the] > “Outside”
70. $ data.fetch(:hello, {}). fetch(:from, {}). fetch(:the, {}) > “Outside”
71. $ data.dig(:hello, :from, :the) > “Outside”
72. $ {a: [1, [2]]}.dig(:a, 1, 0) > 2
73. CURRYING Chef cuisinier RUBY
74. def add(a, b) a + b end def subtract(a, b) a - b end def multiply(a, b) a * b end def divide(a, b) a / b end
75. math = lambda do |fn, a, b| a.send(fn, b) end $ math.(:+, 1, 2) > 3
76. math = lambda do |fn, a, b| a.send(fn, b) end add = math.curry.(:+) subtract = math.curry.(:-) multiply = math.curry.(:*) divide = math.curry.(:/)
77. $ add.(1, 2) > 3 $ subtract.(1, 2) > -1 $ multiply.(1, 2) > 2 $ divide.(1, 2) > 0
78. $ increment = add.curry.(1) $ increment.(41) > 42
79. ENUMERABLE Everyone.each RUBY
80. #any? #all? #find #inject #select #take
81. class Color include Enumerable def each yield “red” yield “green” yield “blue” end end
82. $ Color.new.map(&:reverse) > ["der", "neerg", "eulb"]
83. DATA, MAIS D’OÙ VIENS-TU? Un petit cachotier RUBY
84. __END__ puts 1 puts 2 __END__ puts 3
85. DATA puts 1 puts 2 eval(DATA.read) __END__ puts 3
86. PERL, TU ES SI SEXY Un nostalgique RUBY
87. Notation % $ %{Hello, world!} > “Hello, world!”
88. %q[ ] String non interpolée %Q[ ] String interpolée %r[ ] Expression régulière interpolée %i[ ] Tableau non interpolé de symboles %I[ ] Tableau interpolé de symboles %w[ ] Tableau non interpolé de mots %W[ ] Tableau interpolé de mots %x[ ] Commande shell %s[ ] Symbole non interpolé
89. $ %w[hello it’s me] > ["hello", "it’s", “me”] $ %i[hello it’s me] > [:hello, :it’s, :me] $ %r[hello it’s me] > /hello it’s me/
90. %(Hello, World!) %[Hello, World!] %~Hello, World!~ %`Hello, World!` %?Hello, World!? %$Hello, World!$
91. OPÉRATEUR DE NAVIGATION SÉCURISÉE CSST RUBY
92. if author if author.address if author.address.city puts author.address.city.name end end end
93. author.try!(:address).try!(:city).try!(:name)
94. author&.address&.city&.name
95. RUBY -R Christian Blais RUBY
96. ruby -run -e httpd . $ ruby -run -e httpd . -p 8000 > INFO WEBrick 1.3.1 > INFO ruby 2.2.3 (2015-08-18) > INFO pid=1766 port=8000
97. -run
98. -rubygems
100. MERCI! @christianblais SHOPIFY