block10.js

function goodProm(maybePromise) {
  return Promise.resolve(maybePromise);
}

goodProm(5).then(console.log); // 5

var fivePromise = fetchMeNumber(5); // this is a promise which resolves into number 5

goodProm(fivePromise).then(console.log); // 5

// Notice it unwraps all the layers of promises automagically!
goodProm(Promise.resolve(Promise.resolve(5))).then(console.log); // 5