prof3ssorSt3v3

// Default Function Parameters
// new ES6 feature allowing us to provide
//default values for function parameters

function sendMessage(email, message, title="message"){
    if(!email || !message){
        return false;
    }
    //title = title || "";
    //fancy code to send the message

prof3ssorSt3v3

// ES6 Destructuring
//extracting values from objects and arrays
//and assigning them to multiple variables

let name, id, nm, num, star, planet, rest;
let personObj = {name:"Arthur Dent", id:42, planet:'Earth'};
let personArr = ["Zaphod", 123, 'Betelgeuse'];

//[nm, num] = personArr;
//console.log(nm, num);

prof3ssorSt3v3

//Promises - Just the Basic Facts
//wrappers for anything async
// ajax calls, reading files, timeouts, geolocation, talk to a database, or anything that would use a callback function
//use them to get rid of callback hell
//fetch() returns a Promise.

//var result = multiplyTwoNumbers(5, 10);
//console.log(result); //50
//
//var photo = downloadPhoto('http://localhost/cat.jpg');

prof3ssorSt3v3

// Date objects in JavaScript
//https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
// moment.js
let log = console.log;

let d = new Date();
log(d);

let num = 1000 * 60 * 60 * 24 * 365.25 * 40; 
// approx 40 yrs

prof3ssorSt3v3

// Truthy and Falsy in JavaScript
// Boolean-ish
// null, undefined, 0, false, '', "", NaN - FALSEY
//

let log = console.log;
let es = "";
let z = 0;
let n = null;
let u = undefined;

prof3ssorSt3v3

//throwing Errors and Exceptions
//and
//using Try...Catch to handle thrown Errors and Exceptions
//Error Types:
// EvalError, InternalError, RangeError, ReferenceError,
// SyntaxError, TypeError, URIError

try{
    //throw 'Javelin';
    //throw {name:'Bubba', message:'Salmon'};

prof3ssorSt3v3

// template strings / template literals ES6
//
// wrapped with back-tick character like table names in SQL
// Variables and expressions wrapped in ${ }
// Tagged Template Literals

const log = console.log;

let message = 'I\'m going to the store';
let message1 = "And then he said, \"That's what she said.\"";

prof3ssorSt3v3

// for..of loops
// for..of versus for..in loops

let supernatural = { 
    "actors":['Jared Padelecki', 'Jensen Ackles', 'Mark Sheppard', 'Misha Collins'],
    "characters":['Sam Winchester', 'Dean Winchester', 'Crowley', 'Castiel'],
    "seasons":12 };

for( prop in supernatural){
    console.log( prop, typeof supernatural[prop],

prof3ssorSt3v3

// Binary Logical Operators 
// AND &&
//  OR ||
// creating compound if statements

let ingredients = ['ham', 'onion', 'tomato'];

let sandwichHas = function(ingredient){
    for(let i of ingredients){
        if( i == ingredient){

prof3ssorSt3v3

// Maps vs Objects
// ES6 Maps are a good replacement for Objects
// in many circumstances but not all

let a = {'name': 'Sherlock'};
let b = {'name': 'Watson'};
let people = {};

people[a] = 'Detective';  // a  ['object':Object]
people[b] = 'Doctor';      // b  ['object':Object]