The IRBy defines Object#irb. It allows you to start irb super quickly.
gem install irby
Call irb on current context.
require 'irby'
irb # start irb session
Call irb of an object.
require 'irby'
"test".irb #=> start irb session
Inspired by http://d.hatena.ne.jp/ursm/20090625/1245951503
Copyright (c) 2010 jugyo. See LICENSE for details.