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Alright GANG #ElixirLang, what do we think about this pattern? See dev.to/martinthenth...

Hard pass. I dislike how things which are strongly related (validation and the corresponding error) are separated so far apart. This is what I do instead 👇

Fully agree. I would also consider converting the 2 boolean functions to those that return :ok | {:error, reason}: is_email_address? => validate_email_address is_available => check_availability It's also future-proof if additional error reasons pop up. You may say I generally dislike booleans :)

I think having boolean funs is fine, they might be useful in other scenarios. The `validate` helper is a simple way of converting a boolean to ok/error.