Deconstructing

var myArray = [10, 20, 30, 40]; 
var item1 = myArray[0]; 
var item2 = myArray[1]; 
var item3 = myArray[2]; 
var item4 = myArray[3]; 

Alternative syntax

var [item1, item2, item3, item4] = myArray; 

It can even work on multiple lines
It can even work with a comma after item4

var [ 
   item1, 
   item2, 
   item3, 
   item4, 
] = myArray 

You can even use an array containing all the other values

var [ 
   item1, 
   item2, 
   ...moreArgs 
] = myArray 

You can even add default values

var [ 
   item1, 
   item2 = true, 
   ...moreArgs 
] = myArray 

before

let myArray = ['one', 'two', 'three'];  
let e1 = myArray[0]; 
let e2 = myArray[1]; 
let e3 = myArray[2]; 

after

let e1, e2, e3 
[e1, e2, e3] = [ ];