gistfile1.txt

require 'pry'

module ArrayFiltering

  module_function

  FILTERS = [3,5,6,7]

  def process(string)
    string.split(',').map(&:to_i).reject(&:zero?).map do |i|
      return [] if all_or_none?(i)
      in_available_filters(i)
    end.compact
  end

  private

  def all_or_none?(i)
    (i == -1 || i == -2) ? true : false
  end

  def in_available_filters?(i)
    i if FILTERS.include? i
  end

end

ArrayFiltering.process('0,0,1,2,3')
binding.pry