?? in javascript es6 code example

Example 1: ellipsis javascript

/* Spread syntax ( ex. ...arrayName) allows an iterable such as an array expression or string 
to be expanded in places where zero or more arguments (for function calls) 
elements (for array literals) are expected, or an object expression to be 
expanded in places where zero or more key-value pairs (for object literals) 
are expected. */


//example
function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3];

console.log(sum(...numbers));
// expected output: 6

Example 2: explain js es6

explain js es6

Example 3: javascript es6

ES6 refers to version 6 of the ECMA Script programming language
It is a major enhancement to the JavaScript language, and adds many more
features intended to make large-scale software development easier.

ECMAScript, or ES6, was published in June 2015.
It was subsequently renamed to ECMAScript 2015.

Example 4: es6 spread

const numbers = [43, 3, 11, 54];
const max = Math.max(...numbers); // Spreads numbers as parameters
// max is 54