From: Andy Joel <ak_joel@...>
Date: 2008-07-19T07:15:07+09:00
Subject: Array.index with block not working

Documentation from here:
http://www.ruby-doc.org/core/classes/Array.html#M000290
_______

Returns the index of the first object in self such that is == to obj. If
a block is given instead of an argument, returns first object for which
block is true. Returns nil if no match is found.
   a = [ "a", "b", "c" ]
   a.index("b")        #=> 1
   a.index("z")        #=> nil
   a.index{|x|x=="b"}  #=> 1
This is an alias of find_index.
_______

Typing the example into IRb gives an error after the fourth line:
ArgumentError: wrong number of arguments (0 for 1)

Why would that be? Am I missing something? Is the documentation wrong?
What should I be doing?

Ruby 1.8.6 by the way.
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