From: "Xavier R." <lists@...>
Date: 2013-02-24T03:01:54+09:00
Subject: Re: how to see the class creation time in Ruby?

One more thing to say here is below:

>> foo = Array.new(2,15)
=> [15, 15]

>> foo.last_modified
NoMethodError: undefined method `last_modified' for [15, 15]:Array
  from (irb):15
  from /usr/bin/irb:12:in `<main>'

Why the above error coming,whereas Array.methods showing it present in 
ruby?

>> Array.methods
=> [:[], :try_convert, :method_added, :last_modified, :allocate, :new, 
:superclass, :freeze, :===, :==, :<=>, :<, :<=, :>, :>=, :to_s, 
:included_modules, :include?, :name, :ancestors, .... etc

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