Add method to an instanced object

Question

obj = SomeObject.new

def obj.new_method
  \"do some things\"
end

puts obj.new_method
> \"do some things\"

This works ok. However, I need to do

Answer 1

You can use modules.

module ObjSingletonMethods
  def new_method
    "do some things"
  end
end


obj.extend ObjSingletonMethods

puts obj.new_method # => do some things

Now if you need to add more methods to that object, you just need to implement the methods in the module and you are done.