RSVP.Promise#catch()

catch is simply sugar for then(undefined, onRejection) which makes it the same as the catch block of a try/catch statement.

function findAuthor(){
  throw new Error('couldn't find that author');
}

// synchronous
try {
  findAuthor();
} catch(reason) {
  // something went wrong
}

// async with promises
findAuthor().catch(function(reason){
  // something went wrong
});