toplevel.js

function rejectOn4(v) {
  if (v === 4) {
    throw "crash";
  }
}

function increment(v){
  return v++;
}
function chain(v) {
  return Promise.resolve(v)
    .then(increment)
    .then(rejectOn4);
}

Promise.resolve(1)
  .then(chain)
  .then(chain)
  .then(chain)
  .then(chain)
  .then(chain)
  .then(chain)
  .then(() => {
    console.log("success");
  }, (err) => {
    console.log("deal with it")
  })