ES2016

ES2016 was a much smaller update than ES2015.

Array.Includes()

Array.includes returns a boolean value.

const isIncluded = [1,2,3,4,5,6,7].includes(6);
console.log(isIncluded);

Exponentiation Operator

The exponentiation operator has the same effect as Math.pow.

let x = 2 ** 2;
let y = Math.pow(2, 2);
console.log(x, y);