sorry for my poor english...

Ruby 2.1.0 String.b #=> http://www.ruby-doc.org/core-2.1.0/String.html#method-i-b

& I tried require(gemfile) radix in rails & use will be fail
~/.rvm/gems/ruby-2.1.0/gems/radix-2.2.0/lib/radix/operator.rb:51:in 'b': wrong number of arguments (0 for 1) (ArgumentError) from ~/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/erb.rb:600:in 'compile' from ~/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/erb.rb:800:in 'initialize'