Promise and Async/Await

promise-and-async-await.js

function getUser() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      return resolve({
        id: 1,
        name: 'Aladin',
        birthDate: new Date()
      });
    }, 1000);
  });
};

function getPhone(userId) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      return resolve({
        number: '999998888',
        ddd: '11'
      });
    }, 2000);
  });
};

function getAddress(userId) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      return resolve({
        addressLine: 'Rua Pedro Alvares Cabral',
        number: '1500'
      })
    }, 2000);
  });
};

async function asyncAwait() {
  try {
    const user = await getUser();
    const phoneAndAddress = await Promise.all([
      getPhone(user.id),
      getAddress(user.id)
    ]);

    user.phone = { ...phoneAndAddress[0] };
    user.address = { ...phoneAndAddress[1] };

    console.log(`
      Name: ${user.name},
      Phone: (${user.phone.ddd}) ${user.phone.number},
      Address: ${user.address.addressLine}, ${user.address.number}
    `);
  } catch (error) {
    console.error('Something is broken: ', error);
  }
}

function getUserExtraInfo(user) {
  return Promise.all([
    getPhone(user.id),
    getAddress(user.id)
  ]).then((phoneAndAddress) => {
    return {
      ...user,
      phone: phoneAndAddress[0],
      address: phoneAndAddress[1]
    };
  });
}

function onlyPromise() {
  getUser()
    .then(getUserExtraInfo)
    .then((user) => {
      console.log(`
        Name: ${user.name},
        Phone: (${user.phone.ddd}) ${user.phone.number},
        Address: ${user.address.addressLine}, ${user.address.number}
      `);
    })
    .catch(console.error);
}

asyncAwait();
onlyPromise();