From: Brian Candler <b.candler@...>
Date: 2008-12-11T20:07:10+09:00
Subject: Re: to get help from inside irb console

Sijo Kg wrote:
> For that what I did is
> require 'openssl'
> irb_help OpenSSL::Random.random_bytes

Interesting, irb_help is new to me.

> But this gives me error  ArgumentError: wrong number of arguments (0 for 
> 1)

That is because what you're really doing there is

  irb_help(OpenSSL::Random.random_bytes())

That is, you're calling the function OpenSSL::Random.random_bytes, which 
requires an argument that you're not providing. That's where the error 
is raised.

So you need to quote the text:

  irb_help "OpenSSL::Random.random_bytes"

However as I said already, there's no help for this built into 
ruby/ri/rdoc.

irb(main):013:0> irb_help "OpenSSL::Random"
Nothing known about OpenSSL::Random

If you're passing a class, you don't need to quote it, because the class 
object itself is passed and irb_help converts it to the classname:

irb(main):014:0> irb_help String
... shows info about String
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