before and after tuple.rb method

gistfile1.txt

# normal usage in array method
@tuple.swap i, random

# becomes
swap(@tuple, i, random)

# normally in tuple.rb
  def swap(a, b)
    temp = at(a)
    self[a] = at(b)
    self[b] = temp
  end
  
# in array rb becomes

  def self.swap(tuple ,a, b)
    temp = tuple.at(a)
    tuple[a] = tuple.at(b)
    tuple[b] = temp
  end
  private :swap