Javascript Promise Pattern - differentiate error

Question

Consider this block of code:

    getUser(userId)
    .catch(function(error){
        crashreporter.reportError(\'User DB failed\', error);
        // show us         


        

Answer 1

You should just have one catch for your chain, but you can add more context to the errors that are thrown in each function. For example, when an error condition occurs in chargeCreditCard you could tack onto the error a message property corresponding to what you want to report. Then in your catch error handler you can pass that message property into the reporter:

getUser(userId)
  .then(chargeCreditCard)
  .catch(reportError);

function reportError(error) {
  crashreporter.reportError(error.message, error);
}