he/him 
Real talk though.... that code is really hard to write. Not a reason not to do it, just takes time and thought.
If you’re writing validation code, please never make it output “Incorrect foo” or “Invaid bar”. Pleeeaaase just tell me what I need to fix, and why it’s invalid.
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I think the problem is with the messages, not the validation itself. Rather than an obscure ‘The address was invalid’, it’s suggested that you add additional details about what format is expected. This way, the user won’t have to guess.
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throw new Error(“undefined is not a function”);
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Error: invalid developer request.
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Defensive Design for the Web: How to improve error messages, help, forms, and other crisis points https://www.amazon.com/dp/073571410X/ref=cm_sw_r_cp_apa_i_xfuSCbC67P0PA …
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Same for any rest APIs that return 400s for bad input. Please please tell me what I did wrong. "Incorrect Parameters" is helpful to exactly 0 people.
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There were errors validating your form submission. Please skim through the whole thing and find the red outline and then figure out what went wrong and submit and repeat.
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This would make a great lightning talk!
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I do that. I will not do it anymore.
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“Incorrect tweet! All of it! Who the hell writes validation for their forms?!” Like this?
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