javascript #

Notes #

• you cannot make the connectedCallback of a web component async becuase it doesn’t match the function signature of the htmlelement class

  • you can make an async render() function

• when using .innerHTML is it dangerous and might allow for XSS, use .textContent

  • does .textContent sanitize??

• data-url html attributes are accessed with .dataset.url in js

• attributeChangedCallback(prop, value), web component method

• dont forget to import the web component classes in the app.js, or import tree

• history.pushState(“null”,:"", “/fake-url”)

  • will update the back and forward button because that cycles history statese
  • pop state is back

• a service worker is a web worker

  • web workers are separate threads
  • but a service worker can work as a proxy and local web server
    • service worker stores requests and responses in the cache in the browser
      • can create a separate cache section within the browswer cache
      • this is separate from the network tab cache though

Code Snippets #

//show the keys of an object
Object.keys(obj)

 pool = new Pool({
	host: 'localhost',
	database: 'postgres',
	user:'postgres',
	password:'mynewpassword',
	port: 5432
});

express & ejs #

• the route for to find public depends on the nested routing js file…
  • monies js routes need ../nav/nav.css and ../nav/nav.js instead of just nav/nav .. super fucking annoying

auth & session #

npm i passport-local
npm i express-session
npm i connect-flash

express session #

• requires express-session
• sessions are server side in memory / in database data that corresponds to a user, logged in or not, express-session sends a session id cookie to the browser and keeps track of cookie data for that use
• this will need to be upgraded to a real db in production

connect-flash #

passport #

hono #

• if there is an error starting deno because of a tsx error there probably is just a typo in the component

algorithms #

// javascript recursive factorial
function factorialize(num) {
  if(num == 1 || num == 0){
    return 1
  } else {
    return (num * factorialize(num-1))
  }
  return num;
}

factorialize(5);

// javascript bubble sort
function bubble_sort(arr){
	for(let i=0; i < arr.length;i++){
		for(let j = 0; j< arr.length - 1 - i; j++){
			if (arr[j] > arr[j+1]){
				const tmp = arr[j];
				arr[j] = arr[j+1];
				arr[j +1] = tmp;
			}	
		}
	}
}

// javascript recursive factorial
function factorialize(num) {
  if(num == 1 || num == 0){
    return 1
  } else {
    return (num * factorialize(num-1))
  }
  return num;
}

factorialize(5);