What is the best way to catch error on promise and why?

Question

I have two code examples for catching promise error. What is better way and why is that so?

I have this code with .catch()

Message.receive($scope.reference).then(function (response) {
  // on success
}).catch(function (error) {
  // on error
});

Also I have this code, without .catch()

Message.receive($scope.reference).then(function (response) {
   // on success
}, function (error) {
   // on error
});

Answer 1

foo.then(success, error) executes one or the other callback based on whether foo raised an error or not. If success raises an error, you'll get an uncaught error, unless you chain another .catch .

foo.then(success).catch(error) catches any error raised by foo or success . If foo raises an error, success is skipped.

It's not which is better, it depends on what error handling chain you want to establish.