Stupid Ruby Tricks

Ruby is awesome. We all love Ruby. And Ruby loves us. We shouldn't abuse Ruby. Well, maybe a little.

Transcript

1. Stupid Ruby Tricks Stupid Ruby Tricks Mike Moore @blowmage Mike Moore @blowmage
4. Stupid Stupid
6. Mike Moore Mike Moore
7. Mike Moore Mike Moore @blowmage @blowmage
19. Stupid Stupid
20. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet!
21. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet!
22. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet!
23. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet!
24. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet! #FridayHug?!? #FridayHug?!?
25. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet! #FridayHug?!? #FridayHug?!?
26. Hey, can I move to Friday? I won’t be prepared in time. No problem. We’ll move Terence Lee to Thursday. Sweet! #FridayHug?!? #FridayHug?!?
29. Its full of puns! Its full of puns!
30. Stupid Stupid
31. Stupid Ruby Trick #1 File.write/File.read Stupid Ruby Trick #1 File.write/File.read
33. File.open("stupid.txt", "w") do |file|
 file.write("Its all about closures, yo!")
 end
 

34. File.open("stupid.txt", "w") do |file|
 file.write("Its all about closures, yo!")
 end
 
 message = File.open("stupid.txt") do |file|
 file.read
 end
 puts(message)
36. # File.open("stupid.txt", "w") do |file|
 # file.write("Its all about closures, yo!")
 # end
37. # File.open("stupid.txt", "w") do |file|
 # file.write("Its all about closures, yo!")
 # end File.write("stupid.txt", "Inline, baby!")

38. # File.open("stupid.txt", "w") do |file|
 # file.write("Its all about closures, yo!")
 # end File.write("stupid.txt", "Inline, baby!")
 # message = File.open("stupid.txt") do |file|
 # file.read
 # end
 # puts(message)
39. # File.open("stupid.txt", "w") do |file|
 # file.write("Its all about closures, yo!")
 # end File.write("stupid.txt", "Inline, baby!")
 # message = File.open("stupid.txt") do |file|
 # file.read
 # end
 # puts(message) puts(File.read("stupid.txt"))
40. Stupid Stupid
41. Stupid Ruby Trick #2 Optional Parenthesis Stupid Ruby Trick #2 Optional Parenthesis
42. File.open("stupid.txt", "w") do |file|
 file.write("Its all about closures, yo!")
 end
 File.write("stupid.txt", "Inline, baby!")
 
 message = File.open("stupid.txt") do |file|
 file.read
 end
 puts(message)
 puts(File.read("stupid.txt"))
43. File.open(”stupid.txt", "w") do |file|
 file.write("Its all about closures, yo!")
 end
 File.write("stupid.txt", "Inline, baby!")
 
 message = File.open("stupid.txt") do |file|
 file.read
 end
 puts(message)
 puts(File.read("stupid.txt"))
44. File.open "stupid.txt", "w" do |file|
 file.write "Its all about closures, yo!"
 end
 File.write "stupid.txt", "Inline, baby!"
 
 message = File.open "stupid.txt" do |file|
 file.read
 end
 puts message
 puts File.read "stupid.txt"
45. Stupid Ruby Advice #1 Don’t overload lines Stupid Ruby Advice #1 Don’t overload lines
48. Stupid Stupid
49. Stupid Ruby Trick #3 Default Hash Values Stupid Ruby Trick #3 Default Hash Values
51. h = { foo: "FOO", bar: "BAR" }
52. h = { foo: "FOO", bar: "BAR" } h[:baz] #=> nil
53. h = { foo: "FOO", bar: "BAR" } h[:baz] #=> nil h.fetch :baz, "BAZ" #=> “BAZ"
54. h = { foo: "FOO", bar: "BAR" } h[:baz] #=> nil h.fetch :baz, "BAZ" #=> “BAZ" h[:baz] = "TROLLFACE"
55. h = { foo: "FOO", bar: "BAR" } h[:baz] #=> nil h.fetch :baz, "BAZ" #=> “BAZ" h[:baz] = "TROLLFACE" h.fetch :baz, "BAZ" #=> "TROLLFACE"
57. hash_list = Hash.new []
58. hash_list = Hash.new [] hash_list[:nope]
59. hash_list = Hash.new [] hash_list[:nope] hash_list[:nope] << :x
60. hash_list = Hash.new [] hash_list[:nope] hash_list[:nope] << :x hash_list[:nope] << :y
61. hash_list = Hash.new [] hash_list[:nope] hash_list[:nope] << :x hash_list[:nope] << :y hash_list[:nope] << :z
62. hash_list = Hash.new [] hash_list[:nope] hash_list[:nope] << :x hash_list[:nope] << :y hash_list[:nope] << :z hash_list[:nope] #=> [:x, :y, :z]
63. hash_list = Hash.new [] hash_list[:nope] hash_list[:nope] << :x hash_list[:nope] << :y hash_list[:nope] << :z hash_list[:nope] #=> [:x, :y, :z] hash_list[:not_even] #=> [:x, :y, :z]
64. hash_list = Hash.new Array.new
 hash_list[:nope]
 hash_list[:nope] << :x
 hash_list[:nope] << :y
 hash_list[:nope] << :z
 hash_list[:nope] #=> [:x, :y, :z]
 hash_list[:not_even] #=> [:x, :y, :z]
66. default #=> "default_value"
 h = Hash.new default

67. default #=> "default_value"
 h = Hash.new default
 h[:nope] #=> "default_value"

68. default #=> "default_value"
 h = Hash.new default
 h[:nope] #=> "default_value"
 default.upcase!

69. default #=> "default_value"
 h = Hash.new default
 h[:nope] #=> "default_value"
 default.upcase!
 h[:nope] #=> "DEFAULT_VALUE"
71. hash_list = Hash.new { |h, k| h[k] = [] }
72. hash_list = Hash.new { |h, k| h[k] = [] } hash_list[:nope]
73. hash_list = Hash.new { |h, k| h[k] = [] } hash_list[:nope] hash_list[:nope] << :x
 hash_list[:nope] << :y
 hash_list[:nope] << :z
74. hash_list = Hash.new { |h, k| h[k] = [] } hash_list[:nope] hash_list[:nope] << :x
 hash_list[:nope] << :y
 hash_list[:nope] << :z hash_list[:nope] #=> [:x, :y, :z]
75. hash_list = Hash.new { |h, k| h[k] = [] } hash_list[:nope] hash_list[:nope] << :x
 hash_list[:nope] << :y
 hash_list[:nope] << :z hash_list[:nope] #=> [:x, :y, :z] hash_list[:not_even] #=> []
77. hash_recurs = Hash.new { |h, k| h[k] = {} }
78. hash_recurs = Hash.new { |h, k| h[k] = {} } hash_recurs #=> {}
79. hash_recurs = Hash.new { |h, k| h[k] = {} } hash_recurs #=> {} hash_recurs[:x] #=> {}
80. hash_recurs = Hash.new { |h, k| h[k] = {} } hash_recurs #=> {} hash_recurs[:x] #=> {} hash_recurs[:x][:y] #=> nil
81. hash_recurs = Hash.new { |h, k| h[k] = {} } hash_recurs #=> {} hash_recurs[:x] #=> {} hash_recurs[:x][:y] #=> nil hash_recurs[:x][:y][:z]
 #=> NoMethodError: undefined method `[]' for nil:NilClass
83. hash_recurs = Hash.new do |h, k|
 h[k] = Hash.new &h.default_proc
 end
84. hash_recurs = Hash.new do |h, k|
 h[k] = Hash.new &h.default_proc
 end hash_recurs[:x] #=> {}
85. hash_recurs = Hash.new do |h, k|
 h[k] = Hash.new &h.default_proc
 end hash_recurs[:x] #=> {} hash_recurs[:x][:y] #=> {}
86. hash_recurs = Hash.new do |h, k|
 h[k] = Hash.new &h.default_proc
 end hash_recurs[:x] #=> {} hash_recurs[:x][:y] #=> {} hash_recurs[:x][:y][:z] #=> {}
87. hash_recurs = Hash.new do |h, k|
 h[k] = Hash.new &h.default_proc
 end hash_recurs[:x] #=> {} hash_recurs[:x][:y] #=> {} hash_recurs[:x][:y][:z] #=> {} hash_recurs #=> {:x=>{:y=>{:z=>{}}}}
89. frankenstein = Hash.new { |h, k| h[k] = [] }
90. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z
91. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z frankenstein[:nope] #=> [:x, :y, :z]
92. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z frankenstein[:nope] #=> [:x, :y, :z] frankenstein[:not_even] #=> []
93. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z frankenstein[:nope] #=> [:x, :y, :z] frankenstein[:not_even] #=> [] frankenstein #=> {:nope=>[:x, :y, :z], :not_even=>[]}
94. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z frankenstein[:nope] #=> [:x, :y, :z] frankenstein[:not_even] #=> [] frankenstein #=> {:nope=>[:x, :y, :z], :not_even=>[]} frankenstein.default_proc = ->(h, k) do
 h[k] = Hash.new &h.default_proc
 end
95. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z frankenstein[:nope] #=> [:x, :y, :z] frankenstein[:not_even] #=> [] frankenstein #=> {:nope=>[:x, :y, :z], :not_even=>[]} frankenstein.default_proc = ->(h, k) do
 h[k] = Hash.new &h.default_proc
 end frankenstein[:x][:y][:z] #=> {}
96. frankenstein = Hash.new { |h, k| h[k] = [] } frankenstein[:nope] << :x << :y << :z frankenstein[:nope] #=> [:x, :y, :z] frankenstein[:not_even] #=> [] frankenstein #=> {:nope=>[:x, :y, :z], :not_even=>[]} frankenstein.default_proc = ->(h, k) do
 h[k] = Hash.new &h.default_proc
 end frankenstein[:x][:y][:z] #=> {} frankenstein
 #=> {:nope=>[:x, :y, :z], :not_even=>[],
 :x=>{:y=>{:z=>{}}}}
98. Stupid Stupid
99. Stupid Ruby Trick #4 include vs. prepend and super Stupid Ruby Trick #4 include vs. prepend and super
100. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 end
 end

101. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 end
 end
 Me.new.do_the_thing
102. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 end
 end
 Me.new.do_the_thing "Me!"
103. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end
104. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end Me.new.do_the_thing
105. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end Me.new.do_the_thing "Me!"
 "Foo!"
106. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end
107. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end Me.new.do_the_thing
108. module Foo
 def do_the_thing
 puts "Foo!"
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end Me.new.do_the_thing "Foo!"
109. module Foo
 def do_the_thing
 puts "Foo!"
 super
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end
110. module Foo
 def do_the_thing
 puts "Foo!"
 super
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end Me.new.do_the_thing
111. module Foo
 def do_the_thing
 puts "Foo!"
 super
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super
 end
 end Me.new.do_the_thing "Foo!"
 "Me!"
 #=> NoMethodError: super: no superclass method `do_the_thing' for #<Me:0x007ff7fe688d70>
112. module Foo
 def do_the_thing
 puts "Foo!"
 super if defined? super
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super if defined? super
 end
 end
113. module Foo
 def do_the_thing
 puts "Foo!"
 super if defined? super
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super if defined? super
 end
 end Me.new.do_the_thing
114. module Foo
 def do_the_thing
 puts "Foo!"
 super if defined? super
 end
 end
 
 class Me
 prepend Foo
 
 def do_the_thing
 puts "Me!"
 super if defined? super
 end
 end Me.new.do_the_thing "Foo!"
 "Me!"
115. module Foo
 def do_the_thing
 puts "Foo!"
 super if defined? super
 end
 end
 
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 super if defined? super
 end
 end
116. module Foo
 def do_the_thing
 puts "Foo!"
 super if defined? super
 end
 end
 
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 super if defined? super
 end
 end Me.new.do_the_thing
117. module Foo
 def do_the_thing
 puts "Foo!"
 super if defined? super
 end
 end
 
 class Me
 include Foo
 
 def do_the_thing
 puts "Me!"
 super if defined? super
 end
 end Me.new.do_the_thing "Me!"
 "Foo!"
118. $ say "it all"
120. Stupid Stupid
123. Stupid Ruby Trick #5 DATA and __END__ Stupid Ruby Trick #5 DATA and __END__
124. class Countries
 COUNTRIES = ["Afghanistan", “Aland Islands",
 "Andorra", “Angola", "Anguilla",
 "Antarctica", "Antigua And Barbuda",
 "Argentina", "Armenia", "Aruba",
 "Australia", “Austria", …]
 end
125. class Countries
 COUNTRIES = DATA.read.split
 end
 
 __END__
 Afghanistan,Aland Islands,Albania,Algeria,…
126. require "yaml"
 
 class Countries
 COUNTRIES = YAML.load DATA.read
 end
 
 __END__
 ---
 - name: Afghanistan
 code: AF
 - name: "Åland Islands"
 code: AX …
129. Stupid Stupid
130. Stupid Ruby Trick #6 pstore Stupid Ruby Trick #6 pstore
131. require "pstore"
 
 db = PStore.new("stupid.pstore")
 
 db.transaction do
 db["useful info"] = 2
 db["puns"] = 999999999
 end
 
 db.transaction true do
 puts "This session has had #{db["useful info"]} tips."
 puts "So far we have had #{db["puns"]} puns."
 end
132. # Update the data
 db.transaction do
 db["useful info"] +=1
 db["puns"] = Float::INFINITY
 end
 
 db.transaction true do
 puts "This session has had #{db["useful info"]} tips."
 puts "So far we have had #{db["puns"]} puns."
 end
134. require "pstore"
 require "ostruct"
 
 db = PStore.new("stupid.pstore")
 
 local_obj = OpenStruct.new name: "Mike Moore",
 username: "blowmage"

135. require "pstore"
 require "ostruct"
 
 db = PStore.new("stupid.pstore")
 
 local_obj = OpenStruct.new name: "Mike Moore",
 username: "blowmage"
 db.transaction do
 db["user"] = local_obj
 end

136. require "pstore"
 require "ostruct"
 
 db = PStore.new("stupid.pstore")
 
 local_obj = OpenStruct.new name: "Mike Moore",
 username: "blowmage"
 db.transaction do
 db["user"] = local_obj
 end
 from_db = nil
 db.transaction do
 from_db = db["user"]
 end
138. class User
 attr_accessor :name, :username
 end
139. class User
 attr_accessor :name, :username
 end
140. class User
 attr_accessor :name, :username
 end require "pstore"
 
 db = PStore.new("stupid.pstore")

141. class User
 attr_accessor :name, :username
 end require "pstore"
 
 db = PStore.new("stupid.pstore")
 local_obj = User.new.tap do |user|
 user.name = "Mike Moore"
 user.username = "blowmage"
 end

142. class User
 attr_accessor :name, :username
 end require "pstore"
 
 db = PStore.new("stupid.pstore")
 local_obj = User.new.tap do |user|
 user.name = "Mike Moore"
 user.username = "blowmage"
 end
 db.transaction { db["user"] = local_obj }

143. class User
 attr_accessor :name, :username
 end require "pstore"
 
 db = PStore.new("stupid.pstore")
 local_obj = User.new.tap do |user|
 user.name = "Mike Moore"
 user.username = "blowmage"
 end
 db.transaction { db["user"] = local_obj }
 from_db = db.transaction { db["user"] }
144. require "yaml/store"
 
 class User
 attr_accessor :name, :username
 end
 
 db = YAML::Store.new("stupid.yml")
 
 local_obj = User.new.tap do |user|
 user.name = "Mike Moore"
 user.username = "blowmage"
 end
 
 db.transaction { db["user"] = local_obj }
 
 from_db = db.transaction { db["user"] }
147. Stupid Stupid
149. Better Sources • http://confreaks.tv/videos/railsconf2012-ten-things-you-didn-t- know-rails-could-do • http://www.thagomizer.com/blog/2015/02/20/the-cool_shit- file.html
150. Thank you! Thank you!
151. Thank you! Thank you!