As every web app, ours rely on a bunch of JS lines of code
We favor ECMAScript 6 (ES6) syntax.

ES6 Useful Features

Default parameters

In ES6, we can put the default values right in the signature of the functions.
var calculateArea = function(height = 50, width = 80) {
// write logic

Template Literals

We can use a new syntax ${PARAMETER} inside of the back-ticked string.
var name = `Your name is ${firstName} ${lastName}.`

Multi-line Strings in ES6

Just use back-ticks.
let lorem = `Lorem ipsum dolor sit amet,
consectetur adipiscing elit.
Nulla pellentesque feugiat nisl at lacinia.`

Arrow Functions

Arrow functions – also called fat arrow functions, are a more concise syntax for writing function expressions. They utilize a new token, =>, that looks like a fat arrow. Arrow functions are anonymous and change the way this binds in functions.
There are a variety of syntaxes available in arrow functions, of which MDN has a thorough list.
Basic Syntax with Multiple Parameters (from MDN)
// (param1, param2, paramN) => expression
// ES5
var multiplyES5 = function(x, y) {
return x * y;
// ES6
const multiplyES6 = (x, y) => { return x * y };
Curly brackets and return aren’t required if only one expression is present. The preceding example could also be written as:
const multiplyES6 = (x, y) => x * y;
Parentheses are optional when only one parameter is present but are required when no parameters are present.
var phraseSplitterEs5 = function phraseSplitter(phrase) {
return phrase.split(' ');
const phraseSplitterEs6 = phrase => phrase.split(" ");
var docLogEs5 = function docLog() {
var docLogEs6 = () => { console.log(document); };
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ES6 Useful Features