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const testString = 'hello';
const reverse = (s) => {
    let arr = Array.from(s),
        left = 0,
        right = arr.length - 1;

    while (left < right) {
        [arr[left], arr[right]] = [arr[right], arr[left]]
        left++
        right--

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// For a detailed explanation regarding each configuration property, visit:
// https://jestjs.io/docs/en/configuration.html
// declaring node_env globally
process.env.NODE_ENV = 'testing';

// script for package.json
"test": "cross-env NODE_ENV=testing jest --watch --verbose --runInBand",

module.exports = {
  // All imported modules in your tests should be mocked automatically

NeniEmSu

VSCode - ESLint, Prettier & Airbnb Setup

1. Install ESLint & Prettier extensions for VSCode

Optional - Set format on save and any global prettier options

2. Install Packages

npm i -D eslint prettier eslint-plugin-prettier eslint-config-prettier eslint-plugin-node eslint-config-node

NeniEmSu

Heroku Cheet Sheet

heroku login # login once
heroku create [name] # Initializes heroku app and adds remote.
heroku addons:create heroku-postgresql:[plane-name] -app [project-name] # add a postgres db addon to your heroku app where plane-name = hobby-dev
heroku logs [--tail] # Shows heroku server terminal
heroku pg:psql # connect to heroku addon database server
heroku config # shows heroku environment variables
 - heroku config:set clown=fiesta # set a config variable

NeniEmSu

function rot13(str) {
  const splitStr = str.split('')
  let finalArr = []
  for(let i = 0; i < splitStr.length; i++){
    for(let j = 0; j < splitStr[i].split('').length; j++){
      
      const currentValueCode 
      = splitStr[i]
      .split('')[j]
      .charCodeAt()

NeniEmSu

#bg {
  background: url("~assets/img/bg-img.jpg") no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  position: relative;
  background-color: grey;

  &:before {