From: malamute jute <mutedev@...>
Date: 2006-04-26T00:35:06+09:00
Subject: difference between :: and . in calling methods

newb here.

whats the difference between :: and . in calling methods? like for 
example:

  File::open and File.open

As I understand, you use :: in invoking the constant of a class like 
Math::PI .

Another thing is if i type these in IRB, it returns the same result:

  Object::constants
  Object.constants

But if i type this, i get undefined method error

  Object.constants.Numeric

whereas this is ok:

  Object::constants::Numeric



So the question now is when do I use the :: and when do I use the . ?

Many thanks.

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