stack.rb

module BackUrls
  extend ActiveSupport::Concern

  class Stack
    attr_reader :stack

    def initialize(stack_storage)
      @stack = stack_storage['back_urls'] ||= Array.new
    end

    def push(element)
      return if element.blank?
      @stack.push(element)
    end

    def pop
      @stack.pop
    end

    def empty?
      @stack.blank?
    end
  end
end