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Ruby Stdlib – Minsk.rb October 2012
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Sergey Nartimov
October 27, 2012
Programming
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Ruby Stdlib – Minsk.rb October 2012
Sergey Nartimov
October 27, 2012
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Transcript
Ruby Stdlib Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest
About me • Rails, Rubinius, Elixir contributor • Software engineer
at Brainspec • Consulting, training, development Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest
Struct
Struct class Point < Struct.new(:x, :y) end
Struct class Point < Struct.new(:x, :y) end point = Point.new(4,
2)
Struct class Point < Struct.new(:x, :y) end point = Point.new(4,
2) point.x # => 4 point.y # => 2
Struct class Point < Struct.new(:x, :y) end point = Point.new(4,
2) point.x # => 4 point.y # => 2 point.z # NoMethodError
OStruct
OStruct require 'ostruct'
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2)
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x
# => 4 point.y # => 2
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x
# => 4 point.y # => 2 point.z # => nil
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x
# => 4 point.y # => 2 point.z # => nil point.z = 0
Set
Set input = [1, -2, 2, 3]
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs end
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs end results # => [1, 2, 2, 3]
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs end results.uniq # => [1, 2, 3]
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs unless ... end results # => [1, 2, 3]
Set require 'set'
Set require 'set' input = [1, -2, 2, 3]
Set require 'set' input = [1, -2, 2, 3] results
= Set.new input.each do |value| results << value.abs end
Set require 'set' input = [1, -2, 2, 3] results
= Set.new input.each do |value| results << value.abs end results # => #<Set: {1, 2, 3}>
SortedSet require 'set' set = SortedSet.new set << 1 set
<< 3 set << 2
SortedSet require 'set' set = SortedSet.new set << 1 set
<< 3 set << 2 output = [] set.each do |value| output << value end output # => [1, 2, 3]
Shellwords
Shellwords pattern = 'belongs_to :user'
Shellwords pattern = 'belongs_to :user' escaped = Shellwords.escape(pattern) system("grep -r
#{escaped} app/models")
Shellwords pattern = 'belongs_to :user' escaped = Shellwords.escape(pattern) system("grep -r
#{escaped} app/models") escaped = pattern.shellescape system("grep -r #{escaped} app/models")
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models']
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
system(Shellwords.join(argv))
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
system(Shellwords.join(argv)) system(argv.shelljoin)
Shellwords cmd = 'grep -r "belongs_to :user" app/ models'
Shellwords cmd = 'grep -r "belongs_to :user" app/ models' Shellwords.split(cmd)
# => ["grep", "-r", "belongs_to :user", "app/models"]
Shellwords cmd = 'grep -r "belongs_to :user" app/ models' Shellwords.split(cmd)
# => ["grep", "-r", "belongs_to :user", "app/models"] cmd.shellsplit # => ["grep", "-r", "belongs_to :user", "app/models"]
SecureRandom
SecureRandom require 'securerandom'
SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw=="
SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw==" SecureRandom.hex # =>
"c0cff5ead6260fe58ebd4ddab83a3497"
SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw==" SecureRandom.hex # =>
"c0cff5ead6260fe58ebd4ddab83a3497" SecureRandom.uuid # => "4b6ff327-cb9f-43e2-a067-342072b144bd"
Delegator
Delegator class Person < Struct.new(:name) end person = Person.new('John')
Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor
= Reddittor.new(person)
Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor
= Reddittor.new(person) redditor.name # => 'John'
Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor
= Reddittor.new(person) redditor.name # => 'John' redditor.submit_link # => 'Link by John'
Delegator require 'delegate'
Delegator class Redditor < Delegator def initialize(person) end end
Delegator class Redditor < Delegator def initialize(person) end def __setobj__(person)
@person = person end def __getobj__ @person end end
Delegator class Redditor < Delegator def initialize(person) __setobj__(person) end def
__setobj__(person) @person = person end def __getobj__ @person end end
Delegator class Redditor < Delegator def initialize(person) __setobj__(person) end def
__setobj__(person) @person = person end def __getobj__ @person end def submit_link "Link by #{name}" end end
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John' redditor.submit_link # => 'Link by John'
tl;dr
Delegator class Redditor < SimpleDelegator def initialize(person) super(person) end def
submit_link "Link by #{name}" end end
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John'
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John' redditor.methods.grep(/name/) # => [:name, :name=]
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John' redditor.methods.grep(/name/) # => [:name, :name=] Redditor.instance_methods.grep(/name/) # => []
Delegator class Redditor < DelegateClass(Person) def initialize(person) super(person) end def
submit_link "Link by #{name}" end end
Delegator class Redditor < DelegateClass(Person) def initialize(person) super(person) end def
submit_link "Link by #{name}" end end Redditor.instance_methods.grep(/name/) # => [:name, :name=]
Thanks! Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest