执行一个对象的实例方法，并在其块中调用另一个对象的实例方法

Posted 2021-02-25

# encoding: utf-8
 
module ObjectExtensions
  def execute(&block)
    Extension.new.execute(&block)
  end
end
 
class Extension
  def execute(&block)
    self.instance_eval(&block)
  end
 
  def one;    puts 'one'   end
  def two;    puts 'two'   end
  def three;  puts 'three' end
end
 
Object.__send__(:include, ObjectExtensions)
 
one   rescue puts 'boom!'       #=> boom!
two   rescue puts 'boom too!'   #=> boom too!
three rescue puts 'boom three!' #=> boom three!
 
execute do
  one   #=> one
  two   #=> two
  three #=> three
  four rescue puts 'boom four!' #=> boom four!
end