[ale] [OT] Defensive Code matters

[mrmthorntonlinux at gmail.com]

Yes.  I've learned to test for impossible conditions. They occur more 
than I expect.


On 03/23/2017 08:47 AM, leam hall wrote:
> I paid an invoice early this morning with PayPal. Unfortunately I 
> typo'd the zip code and the form reset saying I needed to re-enter. 
> That's fine, I typed slowly and got it right the second time.
>
> However, the application encumbered the full amount both times, 
> signficantly reducing my PayPal balance. I've contacted the invoice 
> company and the vendor, so that's not as much of a problem yet.
>
> When you code, do so defensively. In this sort of case gas stations 
> will often debit USD 1 to ensure the transaction is possible, and then 
> do the rest of it later. Right now the invoice processor has given me 
> a bad feel for their coding capabilities. They may be smart, but are 
> they thinking?
>
> Leam
>
>
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