Ruby Tuple Class

tuple.rb

class Tuple < Array
  def initialize(*args)
    @array = args.dup.freeze
  end

  def each(&block)
    @array.each(&block)
  end
  
  def first
    return @array.first()
  end
  
  def last
    return @array.last()
  end

  def size
    return @array.size()
  end
  
  def [](idx)
    return @array[idx]
  end
  
  def to_a
    return Array.new(@array)
  end

  def to_s
    return "(%s)" % @array.join(", ")
  end

  undef <<
  undef concat
  undef pop
  undef push
  undef shift
  undef unshift
  undef uniq!
  undef flatten!
end

# Update the Array class.
class Array
  def to_tuple
    return Tuple.new(*self)
  end
end