From: John Carter <john.carter@...>
Date: 2004-08-09T14:38:11+09:00
Subject: FirstEachLast, an extension to the Enumerable module.

I know somewhere is a collection of extensions to the enumerable module.

Is the rubygarden page
  http://www.rubygarden.org/ruby?StandardClassExtensions/Enumerable
the only one?

Anyway, I have just added FirstEachLast to that.

Use it like so...

require 'FirstEachLast'

def test_first_each_last(any_enumerable_object)
   result = nil
count =
   any_enumerable_object.first_each_last( proc {|first|
                                                 result = "First #{first}"
                                               },
                                               proc {|i|
                                                 result += " then #{i},"
                                               },
                                               proc {|last|
                                                 result += " and last of all #{last}"
                                               },
                                               proc {|| result = 'Empty!'}

   puts count
   puts result
end

test_first_each_last( [1,2,3,4])
test_first_each_last( [])

Will result in the following output...
4
First 1 then 2, then 3, and last of all 4
0
Empty!



John Carter                             Phone : (64)(3) 358 6639
Tait Electronics                        Fax   : (64)(3) 359 4632
PO Box 1645 Christchurch                Email : john.carter@tait.co.nz
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