How to create empty 2d array in javascript?

Question

How do I create an empty 2D array in Javascript (without knowing how many rows or columns there will be in the new array)?

If it\'s a simple array var newArra

Answer 1

There are no two dimensional arrays in Javascript.

To accomplish the effect of a two dimensional array, you use an array of arrays, also known as a jagged array (because the inner arrays can have different length).

An empty jagged array is created just like any other empty array:

var myArray = new Array();

You can also use an empty array literal:

var myArray = [];

To put any items in the jagged array, you first have to put inner arrays in it, for example like this:

myArray.push([]);
myArray[0][0] = 'hello';

You can also create an array that contains a number of empty arrays from start:

var myArray = [[],[],[]];

That gives you a jagged array without any items, but which is prepared with three inner arrays.

As it's an array of arrays, you access the items using myArray[0][1].