RUBY Buffered File Reader by Char

file_io.rb

    class FileIO
      def initialize(filename, buffer_size: 50)
        @filename = filename
        @buffer = ""
        @buffer_size = buffer_size
      end

      def each(&block)
        File.open(@filename, 'r') do |f|
          f.each_char do |c|
            @buffer += c
            if @buffer.size >= @buffer_size
              block.call(@buffer)
              @buffer = ""
            end
          end

          block.call(@buffer)
          @buffer = ""
        end
      end
    end