fronx · January 1, 2011 20:31
diff --git a/map_with_index.rb b/map_with_index.rb
 Enumerable.module_eval do
  def with_index
    index = -1
    map { |item| [item, index += 1] }
  end
 end

 ['a','x','foo'].with_index.map { |a, index| a * index }

 # => ["", "x", "foofoo"]
	Enumerable.module_eval do
	def with_index
	index = -1
	map { \|item\| [item, index += 1] }
	end
	end

	['a','x','foo'].with_index.map { \|a, index\| a * index }

	# => ["", "x", "foofoo"]
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