Method Ruby

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  4. Alias a old method a new name, then change the implementation of old method
class Array
  alias :length_old :length
  def length
    return length_old / 2
  end
end
array = [1, 2, 3, 4]
array.length                                       # => 2
array.size                                         # => 4
array.length_old                                   # => 4
class Array
  alias :length :length_old
end
array.length                                       # => 4