Ruby workshop ISBN

gistfile1.rb

#!/usr/bin/env ruby

isbn_array = []

def to_isbn string
  if ( string.gsub("\n", "") ) 
  	string.gsub!("\n", "")
  end
  if ( string.gsub!(" ", "") )
		string.gsub!(" ", "")
  end
  if ( string.gsub!("-", "") )
		string.gsub!("-", "")
  end
  string
end 


File.open('isbn_list.txt').each_line do |line|
  puts line
  puts '===='
  isbn_array.push( to_isbn( line ) )
end

puts isbn_array.inspect

// ["9780596516178", "9781430223634", "9780321584106", "9780321743121", "9781934356470", "9780321490452"]