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Javascript Property Wizardry

Did you know you can add properties conditionally to an object with spread?

so instead of

function getUser(banned) {
  const userStatus = {banned, banReason: 'Wizard'};
  // only combine the user status if the user is banned
 const user = { name: 'Micah' };

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function log(...args) {
  console.log(args);
}
function getName({name}) {
  console.log(name);
}
function pop([first, ...rest]) {
  return rest;
}
function push(array, elem) {

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const Book = {
  title: 'A book title',
  pages: 55,
  height: 100,
  weight: 2,
  price: 3.50
};
function test1() {
  const {title} = Book;
  console.log(title);

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function getPeople() {
  return [{name: "Bob"}, {name: "Sam"}, {name: "Tom"}];
}
function test1() {
  const [firstPerson] = getPeople();
  console.log(firstPerson);
}
function test2() {
  const [firstPerson, ...rest] = getPeople(); 
  console.log(rest);

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interface Person {
  name: string;
  age: number;
}

interface Car {
  modelName: string;
  year: number;
}

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interface Person {
  name: string;
  age: number;
}

interface Car {
  modelName: string;
  year: number;
}

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/* given an object of type T,
 * log the value of a property, specified by the argument key
 */
function logValue<T>(obj: T, key: keyof T) {
  console.log(obj[key]);
}

function simpleTest() {
  const Micah = {name: 'Micah'};
  logValue(Micah, "name")

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function fetchData(data) {
  return new Promise(resolve => setTimeout(() => {
    resolve(data)
  }, 1000))
}

function getLoggedInUser() {
  return fetchData('user1');
}

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function randomNumber() {
  const rand = Math.random() * 100;
  return new Promise(resolve => setTimeout(() => {
    resolve(rand)
  }, 1000))
}

async function addExampleSerial() {
  console.time('add-serial');
  const number1 = await randomNumber();

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function wait(waitTime) {
  return new Promise(resolve => setTimeout(() => {
    console.log(`waited ${waitTime} ms`)
    resolve()
  }, waitTime));
}

async function serial() {
  console.time('serial');
  await wait(1000);