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copied!<p>Just to extend the answer given by bor1s, about the <em>private</em> methods:</p> <p>In ruby you have "private" and "protected" methods. What bor1s says, is correct when talking about "protected" methods. Declaring a method "private" additionally prevents <em>other instances of the same class</em> from using the method.</p> <p>When you call a "private" method, you cannot use a dot in front of it - you cannot even use <code>self.</code>, even though using or omitting <code>self</code> has usually the same effect.</p> <pre><code>class Xyzzy private def foo puts "Foo called" end public def do_it foo # <= Is OK self.foo # <= raises NoMethodError end end Xyzzy.new.do_it </code></pre> <p>If you change 'private' to 'protected' in the code above, no error will be raised.</p> <p><strong>And about modules:</strong></p> <p>The final result of defining a method in <code>Kernel</code> and extending <code>Kernel</code> with the method defined in some module is the same: in both cases the method is global.</p> <p>Using a module is just a little more elegant, as it groups <em>your</em> changes in one place, but I would say it's a matter of personal taste.</p> <p>Usually you do not include methods in Kernel or Object (as it may be a little dangerous), but you include (or extend) a specific class or object which needs these methods, and in this case you <em>need</em> your methods grouped in a module.</p> <p>Even Rake in version 0.9.0 stopped including the DSL commands in Object:</p> <blockquote> <p>== Version 0.9.0</p> <ul> <li><em>Incompatible</em> *change*: Rake DSL commands ('task', 'file', etc.) are no longer private methods in Object. If you need to call 'task :xzy' inside your class, include Rake::DSL into the class. The DSL is still available at the top level scope (via the top level object which extends Rake::DSL).</li> </ul> </blockquote>

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