Created
July 26, 2012 12:57
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This is me learning "Ruby"...
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| #!/usr/bin/env ruby | |
| def is_valid_isbn13?(isbn13) | |
| sum = 0 | |
| 13.times { |i| sum += i % 2 == 0 ? isbn13[i].to_i : isbn13[i].to_i * 3 } | |
| 0 == sum % 10 | |
| end | |
| puts "Loading file and reading ISBNs..." | |
| isbns = [] | |
| File.open("isbns.txt", "r").each_line do |line| | |
| isbns.push(line) | |
| end | |
| puts "Cleaning ISBNs..." | |
| isbns.collect! do |isbn| | |
| isbn = isbn.scan(/\d/).join('') | |
| end | |
| puts "Checking ISBNs..." | |
| isbns.each do |isbn| | |
| sum = 0 | |
| if (isbn.length != 13 or is_valid_isbn13?(isbn) == false) | |
| puts " - #{isbn} is invalid..." | |
| isbns.delete(isbn) | |
| else | |
| puts " - #{isbn} is valid..." | |
| end | |
| end |
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fair point. Updated.