From: Glenn Ritz <glenn_ritz@...>
Date: 2010-02-19T05:43:58+09:00
Subject: Re: Adding self to Enumerable

Hi,

I posted this earlier but did not enable email notification.  I've done 
so now.  Apologies for the repetition.


I would like to add self to an Enumerable object in Ruby 1.9, like in 
this (admittedly) contrived example:

%w(cat dog mouse).each.with_self { |e, s| puts "self: #{s.inspect}, e: 
#{e}" }

The results of the above code would be:

self: ['cat','dog', 'mouse'], e: cat
self: ['cat','dog', 'mouse'], e: dog
self: ['cat','dog', 'mouse'], e: mouse

I think of the 'with_self' method (which I want to define) as being 
similar to the with_index method, as in the following example:

%w(cat dog mouse bird).each.with_index { |e, i| puts "i: #{i}, e: #{e}"}

I realize that I could have just called each_with_index on the array 
(instead of 'each.with_index') and it probably would have been more 
straightforward, but the above code is just for example purposes.

I believe that this would involve opening up the Enumerable module and 
defining a with_self method, but I do not know what that method should 
look like.

Any help would be appreciated.

Thanks!


Glenn
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