pjcodesjs

/*
  LEETCODE PROBLEM: 1678. Goal Parser Interpretation

  You own a goal-parser that can interpret a string command. The command consists of an alphabet of "G", "()" and/or "(al)" in some order. The goal-parser will interpret "G" as the string "G", "()" as the string "o" and "(al)" as "al". The interpreted strings are then concatenated in the original order.

  Given the string command, return the goal-parser's interpretation of command.

  ----------
  EXAMPLE 1:
  ----------

pjcodesjs

// IMPORT AND INITIALIZE EXPRESS
var express = require ('express');
const fetch = require('node-fetch');
const socketIo = require('socket.io');
var app = express();
var port = 9000;

// CONNECT TO SOCKET IO
const server = app.listen(port);
const io = require('socket.io')(server);

pjcodesjs

import React, { useState, useEffect } from 'react';
import io from 'socket.io-client';

const FeedSection = () => {
	const socket = io("ws://localhost:9000");

	socket.on('latest_quakes', data => {
	  if (data) {
	  	console.log(data);
	  }

pjcodesjs

// REGULAR FUNCTION DECLARATION
function my_cats(a,b,c) {
  return `My cats names are: ${a}, ${b} & ${c}`;
}

my_cats('Tom', 'Marty', 'Jimmy');

// ARROW FUNCTION
let my_cats = (a,b,c) => {
  return `My cats names are: ${a}, ${b} & ${c}`;

pjcodesjs

// SINGLE LINE ARROW FUNCTIONS WITHOUT RETURN KEYWORD OR {}
let oldest_cat = c => `${c} is the oldest one`;

oldest_cat('Jimmy'); // Jimmy is the oldest one

pjcodesjs

//------------------------------------------------
// COPY ELEMENTS FROM ONE ARRAY INTO ANOTHER ARRAY
//------------------------------------------------
const fruits = ['apple', 'mangoe', 'papaya'];
const updated_fruits = ['banana', ...fruits];
console.log(updated_fruits); // [ 'banana', 'apple', 'mangoe', 'papaya' ]

//-------------------
// MERGING TWO ARRAYS
//-------------------

pjcodesjs

// OPTIONAL CHAINING EXAMPLE
let character = {
  name: 'Dean Winchester',
  age: 34,
  car: 'Chevy Imala (Baby)',
  enemy_demons: [ 'Abadon', 'Yellow Eyes', 'Crowley' ],
  enemy_angels: [ 'Zacharia', 'Michael', 'Lucifer' ],
  family: {
    mother: 'Mary',
    father: 'John',

pjcodesjs

let Dean = {
  name: 'Dean Winchester',
  age: 34,
  car: 'Chevy Imala (Baby)',
  enemy_demons: [ 'Abadon', 'Yellow Eyes', 'Crowley' ],
  enemy_angels: [ 'Zacharia', 'Michael', 'Lucifer' ],
  family: {
    mother: 'Mary',
    father: 'John',
  }

pjcodesjs

// REGULAR IF/ELSE
const cat_love_checker = (status) => {
  if (status === false) {
    return 'Sigh... my cat does not love me :(';
  } else {
    return 'Aha! My cat does love me!';
  }
}

cat_love_checker(false); // Sigh... my cat does not love me :(

pjcodesjs

// REGULAR WAY
let fav_num;
let fav_fruit = 'Apple';

console.log(fav_num); // undefined
console.log(fav_fruit); // 'Apple'

// SHORTER WAY
let fav_num, fav_fruit = 'Banana';