[erlang-questions] List comprehension puzzler

Kenneth Lakin <>
Wed Sep 21 08:02:50 CEST 2016

On 09/20/2016 08:08 PM, Richard A. O'Keefe wrote:
> It's hard to believe I'm saying this, but if the HTML form is under
> your control, why not validate the ISBNs with JavaScript code in the
> form?

It's a nice way to avoid a roundtrip to signal data entry errors, but if
the data is important, you'd have to check it again on the server side
anyway. The client can always lie (or malfunction), so you can't trust
what they've sent.

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