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Benchmark Results

Method ISBN param Mean Error StdDev Ratio Gen 0 Gen 1 Gen 2 Allocated
Baseline 0-306-40615-2 8,729.26 ns 163.2073 ns 160.2914 ns 1.000 0.4120 - - 1731 B
ValidatorWithImprovements 0-306-40615-2 36.89 ns 0.7732 ns 1.5262 ns 0.004 - - - -
Validator_vafzamora 0-306-40615-2 30.81 ns 0.5791 ns 0.5417 ns 0.004 - - - -
Baseline 0-306-40615-4 8,695.16 ns 133.8281 ns 118.6351 ns 1.000 0.4120 - - 1731 B
ValidatorWithImprovements 0-306-40615-4 35.82 ns 0.5326 ns 0.4721 ns 0.004 - - - -
Validator_vafzamora 0-306-40615-4 30.86 ns 0.4597 ns 0.4300 ns 0.004 - - - -
Baseline 1111-(...)11111 [140] 16,347.38 ns 210.2670 ns 175.5824 ns 1.000 0.5493 - - 2324 B
ValidatorWithImprovements 1111-(...)11111 [140] 29.75 ns 0.4976 ns 0.4654 ns 0.002 - - - -
Validator_vafzamora 1111-(...)11111 [140] 26.96 ns 0.2832 ns 0.2511 ns 0.002 - - - -

Legends

Mean: Arithmetic mean of all measurements Error: Half of 99.9% confidence interval StdDev: Standard deviation of all measurements Ratio: Mean of the ratio distribution ([Current]/[Baseline]) Gen 0: GC Generation 0 collects per 1000 operations Gen 1: GC Generation 1 collects per 1000 operations Gen 2: GC Generation 2 collects per 1000 operations Allocated: Allocated memory per single operation (managed only, inclusive, 1KB = 1024B) 1 ns: 1 Nanosecond (0.000000001 sec)

More information about the results is available at: BenchmarkDotNet Results

Problem Description

The ISBN standard is used to define a unique identification code for a book that encodes information such as language, book genre, publisher etc.

Each ISBN is of the general form X-XXX-XXXXX-X where the final X is a checksum digit to validate that the ISBN format is correct.

An example of a valid ISBN is: 0-306-40615-2.

ISBN Rules

  1. The first 9 digits are used to represent varies fields and the 10th digit is a checksum to ensure that the ISBN is a valid one. The formula for calculating the ISBN checksum is defined as:

equation

In the ISBN above

equation

The following gives exactly the same result as the formula above.

equation

  1. Where the checksum comes to an exact value of 10, then an 'X' or 'x' is used to represent that in the ISBN code.

Example: 030-000-009-X is ok.

  1. There can only be 0 or 3 '-' in the ISBN.

Example: 0-30640615-2 is invalid

  1. There cannot be be a '-' at the start of the ISBN or at the end.

Example: -0306-40615-2 is invalid

  1. The '-' may not be consecutive.

Example: 0—30640615-2 is invalid