CSV Parser

gistfile1.rb

require 'csv'

class CsvReader
   def initialize
     @number_of_entries = []
   end

  def read_in_csv_data(csv_file_name)
    CSV.foreach(csv_file_name, headers: true ) do |row|
      @number_of_entries << ValueInCells.new( row["Amount"])
    end
  end  
  
  def total_value_in_cells
    sum = 0.0
    if @number_of_entries == 0
      @number_of_entries.each {|cells| sum == sum }
    else
      @number_of_entries.each {|cells| sum += cells.value }
      sum
    end
  end  
  
  def number_of_each_isbn
      
  end
end

class ValueInCells
  attr_accessor :value
  
  def initialize(value)
    @value = Float(value)
  end
end


require_relative 'csv_reader'

reader = CsvReader.new

ARGV.each do |csv_file_name|
  STDERR.puts "Processing #{csv_file_name}"
  reader.read_in_csv_data(csv_file_name)
end                                     

puts "Total value = #{reader.total_value_in_cells}"