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let mySet = new Set([1,2, 3, 4, 5]);

var filtered = [...mySet].filter((x) => x > 3) // [4, 5]

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let arr = [1, 1, 2, 2, 3, 3];
let deduped = [...new Set(arr)] // [1, 2, 3]

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let object1 = { a:1, b:2,c:3 }
let object2 = { b:30, c:40, d:50}
let merged = {…object1, …object2} //spread and re-add into merged
console.log(merged) // {a:1, b:30, c:40, d:50}

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var car = {
  model: 'bmw 2018',
  engine: {
    v6: true,
    turbo: true,
    vin: 12345
  }
}

const modelAndVIN = ({model, engine: {vin}}) => {

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let {_internal, tooBig, ...cleanObject} = {el1: '1', _internal:"secret", tooBig:{}, el2: '2', el3: '3'};

console.log(cleanObject); // {el1: '1', el2: '2', el3: '3'}

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var cars = ['BMW','Benz', 'Benz', 'Tesla', 'BMW', 'Toyota'];

var carsObj = cars.reduce(function (obj, name) { 
   obj[name] = obj[name] ? ++obj[name] : 1;
  return obj;
}, {});

carsObj; // => { BMW: 2, Benz: 2, Tesla: 1, Toyota: 1 }

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//Returns 0 if balanced.
const isParensBalanced = (str) => {
  return str.split('').reduce((counter, char) => {
    if(counter < 0) { //matched ")" before "("
      return counter;
    } else if(char === '(') {
      return ++counter;
    } else if(char === ')') {
      return --counter;
    }  else { //matched some other char

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const numbers = [10, 20, 30, 40];

const doubledOver50 = numbers.reduce((finalList, num) => {
  
  num = num * 2; //double each number (i.e. map)
  
  //filter number > 50
  if (num > 50) {
    finalList.push(num);
  }

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const required = () => {throw new Error('Missing parameter')};

//The below function will trow an error if either "a" or "b" is missing.
const add = (a = required(), b = required()) => a + b;

add(1, 2) //3
add(1) // Error: Missing parameter.

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	" Make IE Better Compatible "

<!--[if IE]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->

======================================================
IE6 Only
==================
_selector {...}