Refactoring: Refactorings/Replace Temp with Chain

A temporary object variable is used to store the result of an expression

Mechanics

1. Return self from methods that you want to allow chaining from
2. Test
3. Remove local variable and chain the method calls
4. Test

Example

Before

class Select
  def options
    @options ||= []
  end

  def add_option(arg)
    options << arg
  end
end

select = Select.new
select.add_option(1999)
select.add_option(2000)
select.add_option(2001)
select.add_option(2002)

After

class Select
  def self.with_option(option)
    select = self.new
    select.options << option
    select
  end

  def options
    @options ||= []
  end

  def and(arg)
    options << arg
    self
  end
end

select = Select.with_option(1999).and(2000).and(2001).and(2002)