From: matt@... (matt neuburg)
Date: 2006-11-27T08:15:09+09:00
Subject: Re: Extremely Noobish Documentation Question

Paco Paco <mepaco@gmail.com> wrote:

> In many examples I have seen File.open used
> but when I refer to the official documentation
> (http://www.ruby-doc.org/core/) the 'open' method is not listed for the
> File class.

Isn't the problem here that the File class inherits from the IO class?
IO has an open method, therefore File has an open method. But you have
to look under IO to see it.

It might be helpful to have on hand a script that reports a class's
methods by cycling up the inheritance chain for you:

def method_report(klass)
  result = klass.ancestors.inject(Array.new) do |result, anc|
    ms = (anc.instance_methods + anc.methods).sort.uniq
    result.last[1] -= ms if result.last
    result << [anc.name, ms]
  end
  result.each do |k, v|
    puts "----", k
    v.each {|m| puts "\s\s#{m}"}
  end
end
# and here's how to use it
method_report(File)

m.
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