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    <p>Although I'm not sure I fully understand the question, I'll try to answer:</p> <p>When you're working inside <code>irb</code> you're really working in a context like this:</p> <pre><code>class Object # you're here end </code></pre> <p>So, if you declare a method inside the REPL you're actually declaring it inside <code>main</code>'s class:</p> <pre><code>ruby-1.9.3-rc1 :001 &gt; def foo; end =&gt; nil ruby-1.9.3-rc1 :002 &gt; self.class.public_methods.include?(:foo) =&gt; true </code></pre> <p>I'm not sure where you get the idea that the methods defined there are private to the class (but again, I might be misunderstanding the question).</p> <p>The class you're inside in <code>irb</code> includes the <code>Kernel</code> module so that's why you have access to its functions (which, since you're inside the class, appear as stand-alone functions even though they're regular methods):</p> <pre><code>ruby-1.9.3-rc1 :003 &gt; self.class.included_modules =&gt; [Kernel] </code></pre> <p>This would make it consistent with the typical Ruby behavior and indeed, <code>main</code> is just <code>self</code> inside the Object class.</p> <p>If you call <code>self</code> you'll receive <code>main</code> because that's the way it's instructed to do it through inspect. We can remove the <code>#to_s</code> method from <code>self</code> and see the real value:</p> <pre><code>ruby-1.9.3-p0 :001 &gt; self =&gt; main ruby-1.9.3-p0 :002 &gt; class &lt;&lt; self; remove_method :to_s; end =&gt; #&lt;Class:#&lt;Object:0x007fc08387af00&gt;&gt; ruby-1.9.3-p0 :003 &gt; self =&gt; #&lt;Object:0x007fc08387af00 @prompt={:PROMPT_I=&gt;"ruby-1.9.3-p0 :%03n &gt; ", :PROMPT_S=&gt;"ruby-1.9.3-p0 :%03n%l&gt; ", :PROMPT_C=&gt;"ruby-1.9.3-p0 :%03n &gt; ", :PROMPT_N=&gt;"ruby-1.9.3-p0 :%03n?&gt; ", :RETURN=&gt;" =&gt; %s \n", :AUTO_INDENT=&gt;true}&gt; </code></pre> <p><em>Edit: Before moving forward I think you should clarify which Ruby version are you using, see the sample below for 1.9.3:</em></p> <pre><code>ruby-1.9.3-p0 :001 &gt; def my_method ruby-1.9.3-p0 :002?&gt; puts "method called" ruby-1.9.3-p0 :003?&gt; end =&gt; nil ruby-1.9.3-p0 :004 &gt; ruby-1.9.3-p0 :005 &gt; [].my_method method called =&gt; nil ruby-1.9.3-p0 :006 &gt; Array.my_method method called </code></pre>
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    1. POInconsistency about ruby 'main' object
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    1. COIf I am inside main's class i.e. class Object in REPL, then why is self set to main and not to Object? For eg: class MyClass; p self; end # => MyClass
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    2. COI've added extra samples to the response to clarify why this is happening :)
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    3. COThanks. That works. I am using ruby-1.9.3-p194. However, if I write the same code in file test.rb and run it using $ ruby test.rb, it shows the error I documented above. Any reason for the anomaly?
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