Javascript: async await, serial async, parallel async.js

const out = {
  userSucc: {
    succ: true,
    t: 200,
    value: {
      name: "krishna",
      age: 20
    }
  },
  userError: {
    succ: false,
    t: 2000,
    value: {
      statusCode: 300,
      message: "Unexpected error"
    }
  },
  dataSucc: {
    succ: true,
    t: 100,
    value: {
      session: '@#$%^&SADFGNBVCX',
      expiry: '12 Dec 2017'
    }
  }
};

let promisify = (out) => 
new Promise(
  (resolve, reject)=> {
  setTimeout(function () {
    if (out.succ) return resolve(out.value)
    else return reject(out.value);
  }, out.t)
});

let findUserSucc = async () => { return promisify(out.userSucc);}
let findUserErr = async () => { return promisify(out.userError);}
let fetchDataSucc = async () => { return promisify(out.dataSucc);}

AwaitSerial = async () => {
  let u, e, d;
  try {
      u = await findUserSucc();
      e = await findUserErr();
      d = await fetchDataSucc();
  } catch(ex) {
    e = ex;
  }
  console.log('AwaitSerial', u, e, d);
}

AllAwaitSerial = async () => {
  let u, e, d;
  try {
    [u, e, d] = [
      await findUserSucc(),
      await findUserErr(),
      await fetchDataSucc()
    ]
  } catch(ex) {
    e = ex;
  }
  console.log('AllAwaitSerial', u, d, e);
}

AllAwait = async () => {
  let u, e, d;
  try {
    [u, e, d] = await Promise.all([findUserSucc(), findUserErr(), fetchDataSucc()]);
  } catch(ex) {
    e = ex;
  }
  console.log('AllAwait', u, d, e);
}

AwaitSerial();
AllAwaitSerial();
AllAwait();