What are the best practices to follow when declaring an array in Javascript?

Question

When I need to declare a new array I use this notation

var arr = new Array();

But when testing online, for example on jsbin, a warning sign

Answer 1

Both are correct only. But most of the people use var a = []

Three Ways to Declare an Array in JavaScript.

method 1: We can explicitly declare an array with the JavaScript "new" keyword to instantiate the array in memory (i.e. create it, and make it available).

// Declare an array (using the array constructor)
var arlene1 = new Array();
var arlene2 = new Array("First element", "Second", "Last");

method 2: we use an alternate method to declaring arrays.

// Declare an array (using literal notation)
var arlene1 = [];
var arlene2 = ["First element", "Second", "Last"];

method 3: JavaScript also lets you create arrays indirectly, by calling specific methods.

// Create an array from a method's return value
var carter = "I-learn-JavaScript";
var arlene3 = carter.split("-");