oliversd

let name='Mike';
let age=30;
let country='Italy';

console.log(`${name} is
 ${age} years old and
 lives in ${country}
`);

// Mike is

oliversd

let a = 5;
let b = 10;

console.log(`The sum of a and b is ${a+b} and the multiplication is ${a*b}`); 
// The sum of a and b is 15 and the multiplication is 50

oliversd

let dog = {name: 'Toby', age: 3, race: 'Beagle', size: 'small'}

let puppy = {…dog, name: 'Max', age: 1}; // Clone dog object and modify its properties

console.log(puppy); // {name: 'Max', age: 1, race: 'Beagle', size: 'small'}
console.log(dog); // {name: 'Toby', age: 3, race: 'Beagle', size: 'small'}

oliversd

let name='Toby';
let age=3;
let features = {race: 'Beagle', size: 'small'};

let dog = {name, age, …features}; // We expand the features object

console.log(dog); // {name: 'Toby', age: 3, race: 'Beagle', size: 'small'}

oliversd

let scores = [23, 45, 56];

function averageThreeScores(a, b, c) {
 let sum = a + b + c;
 return sum/3;
}

console.log(averageThreeScores(…scores)); // Result 41.333333…

oliversd

let first = [1,2,3];
let second = [4,5,6];

// If we do this
first.push(second);

// We get
console.log(first); // [1,2,3,[4,5,6]] that is not right

// Using the spread operator

oliversd

let firstName="Albert"
let lastName="Einstein"
let person = {firstName, lastName}

console.log(person.firstName); // "Albert"
console.log(person.lastName); // "Einstein"

oliversd

// Old method
const myArray = ['apple', 'pear', 'orange', 'banana'];
let fruit1 = myArray[0];
let fruit2 = myArray[1];
let fruit3 = myArray[2];
let fruit4 = myArray[3];

//ES6 destructuring
let [fruit1, fruit2, fruit3, fruit4] = myArray; // much better isn't? 

oliversd

//ES6 Arrow function one-liner
let doubleNumbers = [1,2,3,4,5].map(number => number*2);

//ES6 Arrow function multiple arguments
handleClick((event, seconds) => {
 event.preventDefault();
 displayFireworks();
 showAnimation(seconds);
});

oliversd

//ES5
let doubleNumbers = [1,2,3,4,5].map(function(number) { 
 return number*2;
});
//ES6 Arrow function
let doubleNumbers = [1,2,3,4,5].map((number) => { 
 return number*2 
});