Isbn Verifier in Ruby
Check if a given string is a valid ISBN-10 number.
exercism fetch ruby isbn-verifier
The ISBN-10 verification process is used to validate book identification
numbers. These normally contain dashes and look like:
The ISBN-10 format is 9 digits (0 to 9) plus one check character (either a digit or an X only). In the case the check character is an X, this represents the value '10'. These may be communicated with or without hyphens, and can be checked for their validity by the following formula:
(x1 * 10 + x2 * 9 + x3 * 8 + x4 * 7 + x5 * 6 + x6 * 5 + x7 * 4 + x8 * 3 + x9 * 2 + x10 * 1) mod 11 == 0
If the result is 0, then it is a valid ISBN-10, otherwise it is invalid.
Let's take the ISBN-10
3-598-21508-8. We plug it in to the formula, and get:
(3 * 10 + 5 * 9 + 9 * 8 + 8 * 7 + 2 * 6 + 1 * 5 + 5 * 4 + 0 * 3 + 8 * 2 + 8 * 1) mod 11 == 0
Since the result is 0, this proves that our ISBN is valid.
Given a string the program should check if the provided string is a valid ISBN-10. Putting this into place requires some thinking about preprocessing/parsing of the string prior to calculating the check digit for the ISBN.
The program should be able to verify ISBN-10 both with and without separating dashes.
Converting from strings to numbers can be tricky in certain languages.
Now, it's even trickier since the check digit of an ISBN-10 may be 'X' (representing '10'). For instance
3-598-21507-X is a valid ISBN-10.
Generate a valid ISBN-13 from the input ISBN-10 (and maybe verify it again with a derived verifier).
Generate valid ISBN, maybe even from a given starting ISBN.
For installation and learning resources, refer to the exercism help page.
For running the tests provided, you will need the Minitest gem. Open a terminal window and run the following command to install minitest:
gem install minitest
If you would like color output, you can
require 'minitest/pride' in
the test file, or note the alternative instruction, below, for running
the test file.
Run the tests from the exercise directory using the following command:
To include color from the command line:
ruby -r minitest/pride isbn_verifier_test.rb
Converting a string into a number and some basic processing utilizing a relatable real world example. https://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-10_check_digit_calculation
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.