JS: ECMAScript 2016

Array.prototype.includes

Improved version of Array.prototype.indexOf . Now can detect NaN and empty element in Sparse Array as undefined

• JS: Array.prototype.includes

Power operator: double asterisk **

easier syntax for Math.pow(x, y)

console.log(3 ** 2 === 9);
// true

• JS: Arithmetic Operators
• JS: Math (namespace)

Power assignment operator: double asterisk equal **=

let x = 3;
x **= 2;
console.log(x === 9);

• JS: Assignment Operators