Chainable error-resulting functions

gistfile1.txt

// option 1: use Q.when/Q.fcall along with a normal error throw
function doWork(){
  throw "bad" 
}
Q.when(doWork(),next)
Q.fcall(doWork()).then(next)

// option 2: craft a rejected promise & return that
function badPromise(err){
   // note: reject(err) returns the now-rejected promise, not the defer.
  return Q.defer().reject(err)
}
function doWork(){
  return badPromise("bad")
}
doWork().then(next)