promises.js

function sleepReject(time, msg) {
  return new Promise((resolve, reject) => {
    setTimeout(() => reject(msg || 'reject'), time);
  });
}

async function test() {
  try {
    let valuePromises1 = [1000, 2000, 3000].map(x => sleepReject(x));
    let valuePromises2 = [4000, 5000].map(x => sleepReject(x));

    let values1 = await Promise.all(valuePromises1);
    let values2 = await Promise.all(valuePromises2);
    console.log(values1);
    console.log(values2);
  } catch (error) {
    console.log(error);
  }
}

test()

// node promises.js
// UnhandledPromiseRejections EVERYWHERE