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Website Info:

address - http://54.83.143.109/

ssh -i Downloads/[key] [email protected]

Notes: to solve conflicts: open file -> resolve merge -> commit with -am -> push

image Puts space around the content of selected elements

What is the order of the CSS box model, starting from the outside going in? margin, border, padding, content

image cow:rat:fish

image Adds a mouseover event listener to a p elemen

Which of the following is NOT a valid JavaScript function? v/ function f(x) = {} x const f = (x) => {} x const f = function(x) {} x function f(x) {}

Which of the following is a valid JavaScript object? v/ { n:1 } x { "n"=1 } x { n=1 } x { "n"="1" }

What does the DOM textContent property do? Sets the child text for the an element

Which of the following is valid JSON? {"x":3}

The following console command makes a script executable: chmod +x deploy.sh

To point to another DNS record, you should use the following DNS record type: CNAME

image burger fries taco shake noodles

image A D B

JSON: A lightweight data-interchange format used to share information across programs.

Because functions are first order objects in JavaScript they can be declared anywhere and passed as parameters. This results in code with lots of anonymous functions cluttering things up. To make the code more compact the arrow syntax was created. This syntax replaces the need for the function keyword with the symbols => placed after the parameter declaration. The enclosing curly braces are also optional. This is a function in arrow syntax that takes no parameters and always returns 3. () => 3;

() => 3; // RETURNS: 3

() => { 3; }; // RETURNS: undefined

() => { return 3; }; // RETURNS: 3

Function Meaning Example push Add an item to the end of the array a.push(4) pop Remove an item from the end of the array x = a.pop() slice Return a sub-array a.slice(1,-1) sort Run a function to sort an array in place a.sort((a,b) => b-a) values Creates an iterator for use with a for of loop for (i of a.values()) {...} find Find the first item satisfied by a test function a.find(i => i < 2) forEach Run a function on each array item a.forEach(console.log) reduce Run a function to reduce each array item to a single item a.reduce((a, c) => a + c) map Run a function to map an array to a new array a.map(i => i+i) filter Run a function to remove items a.filter(i => i%2) every Run a function to test if all items match a.every(i => i < 3) some Run a function to test if any items match a.some(i => 1 < 1)

Port 80 is reserved for : http

Status Codes:

  • 200 -> success
  • 300 -> Content redirects or caching
  • 400 -> Client errors
  • 500 -> Server errors

Standard HTTP headers:

  • Content-Type
  • host
  • cookie

Cookies allow: A server to store data on the client

Websocket - It is peer to peer instead of client to server

"npm install ws": O Locks the version of the websocket package for your application O Adds the websocket source code to the node_modules directory X Adds template code for websockets to your JavaScript O Adds a dependency to your package.json file

Linux Daemon: O Executes independent of a user O Starts when the computer is rebooted O PM2 is an example of a daemon X Cannot fork other processes