Owen,
I could be wrong, but I think your question stems from the "only use
exceptions for exceptional things" philosophy. This philosophy is partly
due to performance considerations
<http://blog.codinghorror.com/creating-more-exceptional-exceptions/> and mostly
from the way exceptions bubble
<http://stackoverflow.com/questions/180937/are-exceptions-really-for-exceptional-errors>
and interrupt the sequential execution of the code.
Neither of these considerations apply in languages like C and Go, which do
not have exceptions (in the C++ and Javascript sense). Node's async error
handling convention (an optional error object that doesn't bubble & must be
explicitly passed) has more in common with C and Go than with
C++/Javascript exceptions.
IOW, passing a null error and putting an error code or an object with
*{success:
false}* in the result is a workaround for a problem that doesn't exist with
Node's async error handling. IMO it's better to put the error where it
belongs, in the first argument to the callback, unless the code in question
doesn't know it's an error b/c the code is operating at a lower layer and
just passing on the information received from the server, as Aria pointed
out, and a higher layer needs to interpret the information and decide
whether it's an error.
-- peter
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