triangle.rb

triangle.rb

class TriangleError < Exception
end

class Triangle
  attr_reader :sides

  def initialize(side1, side2, side3)
    @sides = [side1, side2, side3].sort
    self.validate
  end 

  def validate
    min, mid, max = sides
    raise TriangleError if min <= 0
    raise TriangleError if max >= min + mid 
  end 

  def kind
    min, mid, max = sides
    if min == max 
      :equilateral
    elsif [min, max].include? mid 
      :isosceles
    else
      :scalene
    end 
  end 
end