From: cypher.dp@...
Date: 2007-06-22T02:09:46+09:00
Subject: Reflecting on methods

Hi guys !

I'm a little bit confused about the right way to get the methods of a
class/module.

For this class

class Test
  public
  def Test.pub_class_meth; end

  protected
  def Test.prot_class_meth; end

  private
  def Test.priv_class_meth; end

  public
  def pub_meth; end

  protected
  def prot_meth; end

  private
  def priv_meth; end
end

arr = []
Object.methods.each {|m| arr << m if m =~ /methods/}
arr.each {|m| puts m + " = [" + (Test.send(m) -
Object.send(m)).join(", ") + "]"}

I get the following result:

methods = [priv_class_meth, pub_class_meth, prot_class_meth]
private_instance_methods = [priv_meth]
singleton_methods = [priv_class_meth, prot_class_meth, pub_class_meth]
instance_methods = [pub_meth, prot_meth]
protected_methods = []
private_methods = []
public_instance_methods = [pub_meth]
protected_instance_methods = [prot_meth]
public_methods = [priv_class_meth, pub_class_meth, prot_class_meth]

Question: Why is "prot_meth" not listed in protected_methods ? And
"priv_meth" in private_methods ?
In general: Which of these *_methods gives which result ?

Thanks in advance

Dominik