function p1() {
  return new Promise((resolve, reject) => {
    setTimeout(() => reject("Error in p1"), 1000);
  }).catch((error) => {
    console.error(error);
  })
}

function p2() {
  return new Promise((resolve) => {
    setTimeout(() => resolve("p2 resolved"), 1000);
  });
}

function pAll() {
  Promise.all([p2(), p1()])
    .then((results) => {
      console.log("All data resolved:", results);
    })
    .catch((error) => {
      console.error("Error resolving data:", error);
    });
}

pAll();

First, Error in p1 is logged, then [ 'p2 resolved', undefined ] is logged. Since p1 catches the rejection, it doesn’t propagate to the Promise.all catch handler allowing p2 to resolve. But, since p1 doesn’t return anything, its result is undefined.