From: ahoward <ahoward@...>
Date: 2002-11-28T01:11:37+09:00
Subject: Re: each_with_index & collect_with_index?

On Wed, 27 Nov 2002, Tim Bates wrote:

T> arr.each do |e|
T> 	outerindex = Enumerable.index
T> 	arr.each do |f|
T> 		innerindex = Enumerable.index
T> 		...
T> 	end
T> end

this is all very straight forward using an Enumerable::Iterator, i had to add
only two lines to the class to accomplish this :

  arr = %w(zero one two)
  a = arr.iterator
  a.each do |ea|
    print "a.index(#{a.index}) -> ea : #{ea}\n\t"
    b = arr.iterator
    b.each do |eb|
      print "b.index(#{b.index}) -> eb : #{eb}, "
    end
    print "\n"
  end

  >>
  a.index(0) -> ea : zero
	  b.index(0) -> eb : zero, b.index(1) -> eb : one, b.index(2) -> eb : two,
  a.index(1) -> ea : one
	  b.index(0) -> eb : zero, b.index(1) -> eb : one, b.index(2) -> eb : two,
  a.index(2) -> ea : two
	  b.index(0) -> eb : zero, b.index(1) -> eb : one, b.index(2) -> eb : two,


http://eli.fsl.noaa.gov/lib/ruby/site_ruby/1.6/enumerable.rb

-a


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