From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-05-18T03:06:03+09:00
Subject: Re: Dynamically modifying modules to avoid namespace collisi

Wes Gamble wrote:
> How does this
> 
>   str.to_s.split("::").inject(Object) { |ns,name| ns.const_get(name) }
> 
> work?

It takes a string on the form "A::B::C" and splits it into an array; 
["A", "B", "C"]. When calling #inject on that array, you iterate over 
each element, yielding them to the block (the second parameter). The 
first parameter is the result of the last call to the block, or, if it's 
the first element, the default value, here Object.

   %w(A B C).inject(Object) {|parent, child| parent.const_get(child) }

is the same as

   Object.const_get(:A).const_get(:B).const_get(:C)


Hope that made it clearer


Daniel