escmascript2017.js

// https://medium.freecodecamp.org/here-are-examples-of-everything-new-in-ecmascript-2016-2017-and-2018-d52fa3b5a70e

// EcmaScript2017
// 1. Object.values()
const car = {BMW: 1, Audi: 2, Tesla: 3};
console.log(Object.values(car)); // [1, 2, 3]

//  ESMA2015
console.log(Object.keys(car)); // ["BMW", "Audi", "Tesla"]

// 2. Object.entries()
Object.entries(car).forEach(([key, value]) => console.log(`${key}=>${value}`)) 
// BMW=>1 
// Audi=>2 
// Tesla=>3

// 3. String padding
'5'.padStart(10) // '          5'
'5'.padStart(10, '=*') //'=*=*=*=*=5'
'5'.padEnd(10) // '5         '
'5'.padEnd(10, '=*') //'5=*=*=*=*='

// 4. Object.getOwnPropertyDescriptors
var Car = {
 name: 'BMW',
 price: 1000000,
 set discount(x) {
  this.d = x;
 },
 get discount() {
  return this.d;
 },
};
console.log(Object.getOwnPropertyDescriptor(Car, 'discount'));
const ElectricCar = Object.assign({}, Car);
console.log(Object.getOwnPropertyDescriptor(ElectricCar, 'discount'));
const ElectricCar2 = Object.defineProperties({}, Object.getOwnPropertyDescriptors(Car));
console.log(Object.getOwnPropertyDescriptor(ElectricCar2, 'discount'));