davidystephenson

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

const beta = {
  budget: 7200000,
  director: 'Coppola',
  title: 'The Godfather'

davidystephenson

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

const watchmen = {
  author: 'Moore',
  protagonist: 'Rorschach',
  pages: 450

davidystephenson

# Questions

## 1. JavaScript

Explain the concept of closures in JavaScript and provide a scenario where they might cause memory leaks if not handled properly.

## 2. TypeScript

How would you type a function that accepts either a string or number and returns the same type that was passed in?

davidystephenson

# Issues

## Serious Security Concern

1. Private variables are exposed in .env.example
      1. MONDGODB_URI (db password)
      2. JWT_SECRET
      3. AWS_SECRET_ACCESS_KEY_ID
      4. STRIPE_SECRET_KEY / STRIPE_WEBHOOK_SECRET
      5. SENDGRID_API_KEY

davidystephenson

# Questions

## JavaScript

### Question 1

```javascript
async function fetchUser(id) {
  const response = await fetch(`/api/users/${id}`);
  const user = await response.json();

davidystephenson

import { IdentifyUserInput, identifyUserInputSchema, IdentifyUserOutput, identifyUserOutputSchema, SubmitCampaignInput, submitCampaignInputSchema, SubmitCampaignOutput, submitCampaignOutputSchema } from "../types";

export async function callIdentifyUser (input:IdentifyUserInput): Promise<IdentifyUserOutput> {
  const parsedInput = identifyUserInputSchema.parse(input)
  const body = JSON.stringify(parsedInput)
  const response = await fetch('/api/identifyUser', {
    method: 'POST',
    body
  })
  if (!response.ok) {

davidystephenson

interface Van <Cargo> {
  destination: string
  cargo: Cargo
}

const bakeryVan = {
  destination: 'bakery',
  cargo: 5
}

davidystephenson

function openMine () {
  let diamonds = 21

  function dig (getDug: (remaining: number) => number) {
    const dug = getDug(diamonds)
    diamonds -= dug
    console.log('diamonds', diamonds)
    return dug
  }

davidystephenson

let diamonds: number = 10
function dig (getDug: (remaining: number) => number) {
  let dug = getDug(diamonds)
  diamonds -= dug
  return dug
}

function getOne () {
  return 1
}

davidystephenson

const form = document.getElementById('productForm')

form.addEventListener('submit', async (event) => {
  event.preventDefault()
  const name = document.getElementById('pname')
  const price = document.getElementById('price')
  const units = document.getElementById('units')
  const description = document.getElementById('desc')
  const isAvailable = document.getElementById('instock')
  const category = document.getElementById('category')