const p = new Promise((resolve, reject) => {
  const age = 19;
  if (age > 18) {
    resolve("I am old enough to ...");
  } else {
    reject("What a shame");
  }
});

function order(value) {
  return new Promise((resolve, reject) => {
    resolve(value);
  });
}
function nextOrder(value) {
  return new Promise((resolve, reject) => {
    resolve(value);
  });
}
function lastOrder(value) {
  return new Promise((resolve, reject) => {
    resolve(value);
  });
}

p.then(function(passedValue) {
  return order(passedValue);
})
  .then(function(passedValue) {
    return nextOrder(passedValue);
  })
  .then(function(passedValue) {
    return lastOrder(passedValue);
  })
  .then(function(passedValue) {
    console.log(passedValue);
  });