CODEWITHSUNDEEP
javascriptnode.jsexception
dt0xff
dt0xff

Reputation: 1563

Node-style callbacks: done(exception) or throw exception?

As I can see, it is common to see this line:

if (err) return done(err);

But as I understand it right, I can do this:

if (err) throw err;

Which looks pretty and works good. So what's a difference?

And yea, I know about promises and I like 'em, but still, I want to know answer for this question.

Upvotes: 2

Views: 74

Answers (2)

ploutch
ploutch

Reputation: 1214

Since most errors are asynchronous, you probably want to use a callback to propagate the error back to the error handler.

Try/catch blocks are seldomly used, and only for the few synchronous functions which might fail, like JSON.parse().

Upvotes: 1

vkurchatkin
vkurchatkin

Reputation: 13570

You can do

if (err) throw err;

if the error is fatal and you want your program to crash, because there is no way to catch such an error. If you write a library or a server application you should pass error to callback.

Upvotes: 2

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