davidystephenson

# Sections

1. JavaScript

2. TypeScript

3. Asynchronous Programming

4. Express.js

davidystephenson

# Questions

## JavaScript (Core)

### Language fundamentals

1. What is the difference between passing a primitive value and passing an object as a function argument in JavaScript? What happens in each case when you modify the parameter inside the function?

### Execution model (call stack, event loop, task queues)

davidystephenson

# Socket.io Chat App

## 1. Connection & Identity Registration

- Client connects with a username
- Server accepts or rejects the connection
- Server assigns a socket ID
- User is removed from state on disconnect

### Topics

davidystephenson

export function format(value, formatter) {
  const formatted = formatter(value);
  return formatted;
}

function formatString (value) {
  return value.toUpperCase()
}

function formatNumber(value) {

davidystephenson

const departments = {
  engineering: {
    budget: 500000,
    headcount: 45,
    location: "Building A",
  },
  marketing: {
    budget: 300000,
    headcount: 20,
    location: "Building B",

davidystephenson

const franchises = {
  theGodfather: {
    book: {
      year: 1969,
      author: 'Puzo',
      title: 'The Godfather'
    },
    original: {
      budget: 7200000,
      director: 'Coppola',

davidystephenson

const originals = { 
  theGodfather: {
    budget: 7200000,
    director: 'Coppola',
    title: 'The Godfather'
  },
  theHobbit: {
    author: 'Tolkien',
    year: 1937,
    title: 'The Hobbit'

davidystephenson

const media = {
  theGodfather: {
    budget: 7200000,
    director: 'Coppola',
    title: 'The Godfather'
  },
  theHobbit: {
    author: 'Tolkien',
    protagonist: 'Bilbo',
    price: 20,

davidystephenson

const theHobbit = {
  author: 'Tolkien',
  protagonist: 'Bilbo',
  pages: 300,
  title: 'The Hobbit'
}
const theMatrix = {
  budget: 63000000,
  director: 'Wachowskis',
  title: 'The Matrix'

davidystephenson

const theHobbit = {
  author: 'Tolkien',
  protagonist: 'Bilbo',
  pages: 300
}

const theMatrix = {
  budget: 63000000,
  director: 'Wachowskis',
  title: 'The Matrix'