Promise.all example

promises9.js

// first we need an asynchronous function that returns a promise
function getBurger () {
  return new Promise(function (resolve, reject) {
    // making burger ...
    if (error) {
      reject(error);
    } else {
      resolve(burger);
    }
  });
}

// next, let’s order some burgers
p1 = getBurger();
p2 = getBurger(withCheese);
p3 = getBurger(withCheese, noOnion);

// collect all the receipts
receipts = new Array();
receipts.push(p1);
receipts.push(p2);
receipts.push(p3);

// define what we will do once everyone gets a burger 
function everyoneCanEat () {}

// define what we will do if anyone doesn’t get a burger
function somethingWentWrong () {}

// tell the Promise class you want to wait for ALL the these receipts to be resolved (or rejected)
Promise.all(receipts).then(everyoneCanEat).catch(somethingWentWrong);