LE-1.rb

class LinearEquation

  attr_reader(:eq)
  extend Memoist
  def initialize(&eq)
    raise ArgumentError, "equation must be passed" unless block_given?
    @eq = eq
  end

  def raw_equations
    @eq
      .source
      .split("\n")
      .map(&:strip)
      .select{|x| not x.start_with?("#")}
      .slice(1..-2)
  end
  
  def equations
    raw_equations.map{|s| Equation.new(s) }
  end
  memoize(:equations)

  # ... some others
end