UniqueArray Initial Solution

gistfile1.rb

class UniqueArray
  def self.new(*arg)
    result = arg.flatten.uniq 
    result.each do |n| 
      raise TypeError, "Sorry I only take numbers" if !n.is_a? Fixnum
    end
  end
end

class Array
  def add(new_element)
    self << new_element unless self.include?(new_element)
  end
end

# Returns a UniqueArray object with an array that contains no duplicates as an attribute. 
p UniqueArray.new([1,2,0,2,11]) 

m = UniqueArray.new()

[1,2,0,6,2,11].each do |new_element|
  m.add(new_element)
end

# puts always returns nil so I assumed you meant p/inspect instead..
p m

https://github.com/bbatsov/ruby-style-guide/#exceptions