dannydenenberg

const dimensions = await page.evaluate(() => {
  let sources = []; // an array of the links to each image
  document.querySelectorAll(
    "#react-root > div > div > div > main > div > div.css-1dbjc4n.r-aqfbo4.r-1niwhzg.r-16y2uox > div > div.css-1dbjc4n.r-14lw9ot.r-1tlfku8.r-1ljd8xs.r-13l2t4g.r-1phboty.r-1jgb5lz.r-1ye8kvj.r-13qz1uu.r-184en5c > div > div > div.css-1dbjc4n.r-1jgb5lz.r-1ye8kvj.r-6337vo.r-13qz1uu > div > section > div > div > div img"
  ).forEach(img => {
      if (img.src) {
          sources.push(img)
      }
    });

dannydenenberg

import puppeteer from "puppeteer"; // import the npm package that we installed

(async () => {
  // the rest of the code must be enclosed in an `async` function to be able to `await` for results
  const browser = await puppeteer.launch(); // launches an "invisible" chromium browser
  const page = await browser.newPage(); // takes the browser to a new tab (page)
  await page.goto("https://example.com"); // takes the page to a specific url

  // Get the "viewport" of the page,
  // as reported by the page.

dannydenenberg

let a = String::from("Dude, Rust is sick.");
{
  let b = &a; // ok
  let c = &a; // ok
}

{
  let b = &mut a; // mutable reference. ok.
  *b = String::from("Different!"); // change value. ok
}

dannydenenberg

let a = String::from("Hello, world!"); // a is the owner
let b = a; // ownership has changed to b. What is a?

println!("{}", a); // error[E0382]: borrow of moved value: `a`

dannydenenberg

{                      // s is not valid here, it’s not yet declared
    let s = "hello";   // s is valid from this point forward

    // do stuff with s
}                      // this scope is now over, and s is no longer valid

dannydenenberg

function a() {
  test123();
}

dannydenenberg

let a = 4;
function doit() {
  exec();
}

dannydenenberg

  // this doesn't create a new user but rather updates an existing one by the user name
  // a request looks like this: `https://nodeserver.com/username23?pass=12345` plus the associated JSON data sent in the body of the req
  app.put("/:user", (req, res) => {
    // get the user, compare the hashed + salted password sent in the query to the one in the database, if they match, then update the data
    collection.find({ user: req.params.user }).toArray((err, docs) => {
      if (err) {
        res.send("An error occured in getting the user info." );
      } else {
        // there were matches (there are users with that username)
        if (docs.length > 0) {

dannydenenberg

  // Example request: https://mynodejsurl.com/myusername?pass=mypassword123
  // sends back the user information if the hashed query parameter for `pass` (password) is the right one for the user
  // sends back object with database information as well as a field called `correctPassword` which is either true or false
  app.get("/:user", (req, res) => {
    collection.find({ user: req.params.user }).toArray((err, docs) => {
      if (err) {
        res.send({ response: "An error occured in getting the user info." });
      } else {
        if (docs.length > 0) { // if there were matches (there are users with that username)
          // get the first users password (each user should have a unique username)

dannydenenberg

// the password is sent in the body of the request as the `pass` field
app.post("/:user", (req, res) => {
    // generate the salt using the npm package 'csprng'. 
    // The first argument is the number of bits and the second is the radix (how many characters to choose from, basically)
    const salt = csprng(160, 36);
    
    // hash the password with the salt prepended 
    req.body.pass = hash(`${salt}${req.body.pass}`); 

    // inserts a new document on the server. make sure to store the hash and salt