What’s the difference between “Array()” and “[]” while declaring a JavaScript array?

Question

What\'s the real difference between declaring an array like this:

var myArray = new Array();

and

var myArray = [];
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Answer 1

There is no difference when you initialise array without any length. So var a = [] & var b = new Array() is same.

But if you initialise array with length like var b = new Array(1);, it will set array object's length to 1. So its equivalent to var b = []; b.length=1;.

This will be problematic whenever you do array_object.push, it add item after last element & increase length.

var b = new Array(1);
b.push("hello world");
console.log(b.length); // print 2

vs

var v = [];
a.push("hello world");
console.log(b.length); // print 1