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For those looking for more on "parse don't validate" mentioned in the talk here are links to the original, and two previous discussions.

0. https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-va...

1. https://news.ycombinator.com/item?id=21476261 (original 2019)

2. https://news.ycombinator.com/item?id=27639890 (revisited 2021)

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“Parse don’t validate” reminds me of John Ousterhouts “Define errors out of existence.”[0]

[0] https://youtu.be/bmSAYlu0NcY?t=1315

I thought the same thing when I read the blogpost.

+1, it's become a mantra for me in any code I write that deals with foreign data (which is most of them). Really reshapes your thinking.

No rule of thumb should be a mantra. Parsing when you don’t need to induces unnecessary coupling, which can be quite undesirable in many scenarios. Like any technique, there are times when it’s worth it and times when it’s not.

Is "No rule of thumb should be a mantra" its own counterexample?

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