3 ms·
> but the check digit algorithm would have to change or just get rid of it. It was a relic from 20+ years ago when networks and computers were 1/100th the spee
by digler999 10y ago
> but the check digit algorithm would have to change
or just get rid of it. It was a relic from 20+ years ago when networks and computers were 1/100th the speed they are today. Let them enter invalid numbers. Let the server return an error (as it already does)
- rlucas 10y agoSimilarly, once we did away with legacy electromechanical phone switches, the (phone area code) NANPA started allowing area codes with non-[0,1] middle digits. The big form of 10-digit numbers was retained and extended by relaxing a legacy constraint.
- avar 10y agoThe check digit gets used today by e.g. JavaScript in input forms to indicate a typo in the card number.