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VIN check-digit code hides tricky edge cases, developers warn
Original: A basic VIN check-digit function looks finished after length, charset, and mod-11. Production traffic... # typescript #
Developers are discussing how a VIN validation function in TypeScript can look complete once it checks length, the allowed character set, and the mod-11 check digit, yet still fail on real production traffic. The main pitfalls are the letter X used as the check digit when the remainder is 10, and transliteration mistakes where letters like I, O and Q are confused with digits 1 and 0. The lesson for beginners: validation code needs real-world input, not just happy paths.
Why now: Programmers find it striking that apparently finished validation code still breaks on obscure but real VIN edge cases.
Evidence
- A basic VIN check-digit function looks finished after length, charset, and mod-11. Production traffic... # typescript # webdev # cars # beginners # software # coding # development # engineering # inclusive # community Edge Cases in VIN Check Digits: X, Transliteration Mistakes,… · hackaday@www.urbanmind.net · 1
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