const a = () => {
  return new Promise((resolve, reject) => resolve("a"))
}

const b = () => {
  return new Promise((resolve, reject) => reject("b"))
}

const c = () => {
  return new Promise((resolve, reject) => reject("c"))
}

const x = () => {
  return new Promise((resolve, reject) => resolve("x"))
}

const y = () => {
  return new Promise((resolve, reject) => resolve("y"))
}

const z = () => {
  return new Promise((resolve, reject) => reject("z"))
}

const getPromisesRejected = () => {
  return Promise.allSettled([a(), b(), c(), x(), y(), z()])
    .then(response => {
      const errors = response
                    .filter((promise) => promise.status ==="rejected")
                    .map((promise) => promise.reason)
      console.log(errors);
    }) 
    .catch( () => console.log(e))
}

getPromisesRejected()