| 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
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.
- 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:
In the ISBN above
The following gives exactly the same result as the formula above.
- 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.
- There can only be 0 or 3 '-' in the ISBN.
Example: 0-30640615-2 is invalid
- There cannot be be a '-' at the start of the ISBN or at the end.
Example: -0306-40615-2 is invalid
- The '-' may not be consecutive.
Example: 0—30640615-2 is invalid