Presentation of the main ES6 features

Spread Operator

It allows an iterable to expand items in it.

array = [1, 2];
appended = [3,4];

all = [...aray, ...appended]
console.log(all)

This can be usefull in some situations like this one :

array = [1, 2, 3, 4];
console.log(Math.min(...array));

instead of the old syntax

array = [1, 2, 3, 4];
console.log(Math.min.apply(null, array));

Represent infinite number or args in an array

const sum = (...numbers) => {
    return numbers.reduce((previous, current) => {
        return previous + current;
    });
};

Function can now be written like this

const f = (a, b) => a + b;
console.log(f(1,2));

instead of

function f(a, b) {
    return a + b;
}
console.log(f(1,2));

With arrow syntax !

const f = (a = 10) => console.log(a);
f();
f(1);

With arrays

const array = [1, 2];
const [a, b] = array;
console.log(a, b)

or objects

const person = { name: "Jesus", age: "33" };
const { name, age } = person;
console.log(name, age);