Promise and async Qs

promise-test-01.js

// Question: What is the result of running the following?

function job() {
    return new Promise(function(resolve, reject) {
        reject();
    });
}

let promise = job();

promise
    .then(function() {
        console.log('Success 1');
    })
    .then(function() {
        console.log('Success 2');
    })
    .then(function() {
        console.log('Success 3');
    })
    .catch(function() {
        console.log('Error 1');
    })
    .then(function() {
        console.log('Success 4');
    });

promise-test-02.js

// Let’s imagine we have renderUI function that draws users and comments . 
// This function needs to be run AFTER both getUsers and getUsersInfo requests have returned data

// Questions: How we can do this?

function renderUI(users, comments) {
  console.log('Rendering ....');
  console.log('Users', users);
  console.log('Comments', comments);
}

function getUsers() {
  return new Promise((resolve, reject) => {
    // some request
  })
}

function getComments() {
  return new Promise((resolve, reject) => {
    // some request
  })
}

promise-test-03.js

// Question: What is wrong with the following?

function getUsers()
  return new Promise((resolve, reject) => {
    // some request
  })
}

function getComments() {
  return new Promise((resolve, reject) => {
    // some request
  })
}

async function getData() {
  const users = getUsers();  
  const comments = getComments();
  return [users, comments];
}

Error 1
Success 4