Proper way of handling simple booleans in `with` statement

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My preferred approach for this is to have a generic validate helper which converts boolean into :ok | {:error, reason}:

def validate(true, _reason), do: :ok
def validate(false, reason), do: {:error, reason}

And now with can be expressed as:

with :ok <- validate(is_integer(foo), :not_an_integer),
     :ok <- validate(...),
     ...,
     do: ...

I briefly discussed this in this blog post.

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