Refinements examples for blog post

ref10.rb

class Foo
  def camelize_string(str)
    using Camelize
    str.camelize
  end
end

using RSpec
describe MyClass do
  using RSpec
  it "is awesome" do
    using RSpec
    MyClass.new.should be_awesome
  end
end

ref11.rb

class Foo
  using Camelize

  def camelize_string(str)
    str.camelize
  end
end

using RSpec
describe MyClass do
  it "is awesome" do
    MyClass.new.should be_awesome
  end
end

ref12.rb

class Foo
  using Camelize
    def camelize_string(str)
      str.camelize
    end
  end
end

using RSpec do
  describe MyClass do
    it "is awesome" do
      MyClass.new.should be_awesome
    end
  end
end

ref13.rb

class Yummy
  def foo(str)
    str.camelize # will error
  end

  using StringCamelize

  def bar(str)
    str.camelize
  end
end

ref_1.rb

class Baz < Quux
  def up_and_add(str1, str2)
    str1.upcase + str2.upcase
  end
end

ref_2.rb

module Camelize
  refine String do
    def camelize
      dup.gsub(/_([a-z])/) { $1.upcase }
    end
  end
end

class Foo
  using Camelize

  def camelize_string(str)
    str.camelize
  end
end

ref_3.txt

>> Foo.new.camelize_string('blah_blah_blah')
=> "blahBlahBlah"
>> 'blah_blah_blah'.camelize
NoMethodError: undefined method `camelize' for "blah_blah_blah":String
	from (irb):17
	from /usr/local/bin/irb-2.0.0:12:in `<main>'

ref_4.rb

class Bar < Foo
  def camelize_and_join(str_ary)
    str_ary.map {|str| str.camelize}.join(',')
  end
end

ref_5.rb

module BadRefinement
  refine String do
    def upcase
      reverse
    end
  end
end

class Quux
  using BadRefinement
end

class Baz < Quux
  def up_and_add(str1, str2)
    str1.upcase + str2.upcase
  end
end

ref_6.rb

describe MyClass do
  it "is awesome" do
    MyClass.new.should be_awesome
  end
end

ref_7.rb

def add_all(str_ary)
  str_ary.inject('') do |str, accum|
    accum + str
  end
end

ref_8.rb

module WeirdPlus
  refine String do
    def +(other)
      "#{self} plus #{other}"
    end
  end
end

class MyArray
  def initialize
    @ary = ['foo', 'bar', 'baz']
  end

  def inject(accum, &block)
    @ary.each do |str|
      accum = WeirdPlus.module_exec(str, accum, &block)
    end
    accum
  end
end

def add_all(str_ary)
  str_ary.inject('') do |str, accum|
    accum + str
  end
end

ref_9.txt

>> add_all(MyArray.new)
=> " plus foo plus bar plus baz"

As of ruby 2.0.0-rc1 refinements have been implemented as file scoped therefore calling using from within a class or module fails.