From: Gary Wright <gwtmp01@...>
Date: 2007-04-03T13:17:43+09:00
Subject: Re: Last iteration condition


On Apr 2, 2007, at 11:00 PM, Mike wrote:

> Hi,
>
>    How could I know that current iteration is the last in the series?
>    For example:
>
> [1, 2, 3, 4, 5, 3, 4].each do |element|
>    print element.to_s
>    print ',' if !LAST
> end

Here are a couple of ideas:

require 'generator'
require 'enumerator'

a = [1,2,3,4]
g = Generator.new(a)

while g.next?
   item = g.next
   if g.next?
     puts "#{item} is not the last item"
   else
     puts "#{item} is the last item"
   end
end

a = [5,6,7,8]
a.push(final = Object.new)

Enumerable::Enumerator.new(a).each_cons(2) do |a, b|
   if b == final
     puts "#{a} is the last item"
   else
     puts "#{a} is not the last item"
   end
end



# Gary Wright