From: James Byrne <byrnejb@...>
Date: 2011-02-05T06:58:23+09:00
Subject: Determining uniqueness on a single array element

I am loading file names and mtimes into an array and then putting that
array inside an outer array. I have run into the situation where the
same file sometimes exists in different places in the file system and
occasionally with a different file name.

I need to ensure that I process the contents of each file only once.
So, in addition to the two elements originally captured I now create an
MD5  hexdigest of the file contents: [ f.mtime, f.name, f.hexdigest ]
and store that.

Now I wish to ensure that each distinct hexdigest is processed but once.
I can do this:

   hex_array = []
   outer_array.each do |inner_array|
     next if hex_array.include?( inner_array[2] )
     hex_array << inner_array[2]
     .  .  .

I wonder if there is a better way?  Any suggestions?

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