There's a lot to be gained by isolating the place where the validation needs to be done, and the source of the bugs could be to one place though. Would you rath

There's a lot to be gained by isolating the place where the validation needs to be done, and the source of the bugs could be to one place though. Would you rather have one bit of code that checks 1<=X<=5, or 100 call sites all doing the same thing slightly differently?