How to use define_method inside initialize()

Question

Trying to use define_method inside initialize but getting undefined_method define_method. What am I doing wrong?

class C
          


        

Answer 1

You were almost there. Just point to the class with self.class, don't even need to use :send:

class C
  def initialize(n)    
    self.class.define_method ("#{n}") { puts "some method #{n}" }    
  end
end
ob = C.new('new_method')
ob2 = C.new('new_method2')
# Here ob and ob2 will have access to new_method and new_method2 methods

You can also use it with :method_missing to teach your class new methods like this:

class Apprentice
  def method_missing(new_method)
    puts "I don't know this method... let me learn it :)"
    self.class.define_method(new_method) do
      return "This is a method I already learned from you: #{new_method}"
    end
  end
end
ap = Apprentice.new
ap.read
=> "I don't know this method... let me learn it :)"
ap.read
=> "This is a method I already learned from you: read"