Ruby get instance method definition from Class

Question

I am trying to get definition of method :foo from Class object.

class Bar
  def foo(required_name, optional="something")
    puts "Hello args are #{required_name}, #{optional}"
  end

  def self.bar
    puts "I am easy, since I am static"
  end
end

I cannot create instance of class since I need method definition to evaluate should I create object (app requirments). Bar.class.???(:foo)

I can get with bar definition with Bar.class.method(:bar) but of course I need foo, thanks!

UPDATE:

Using Ruby 1.8.7

Answer 1

You can use the method instance_method on a class like this :

Bar.instance_method(:foo)

which will return an instance of UnboundMethod. (See http://ruby-doc.org/core-1.9.3/UnboundMethod.html)

Answer 2

You can discover if the class has an instance method :foo like so:

Bar.instance_methods.include? :foo

An example:

String.instance_methods.include? :reverse
=> true
String.instance_methods.include? :each
=> false