JavaScript Two Dimensional Arrays

JavaScript Two Dimensional Arrays

In this JavaScript tutorial you will learn about two dimensional arrays - how to define and access two dimensional array in JavaScript.

Two Dimensional Arrays in JavaScript:

Two Dimensional Arrays are storing elements in a structure similar to that of a table.

Defining Two Dimensional Arrays in JavaScript:

One of the vital points to note is JavaScript does not support multi-dimensional arrays and thereby does not support Two Dimensional Array. In order to create a Two Dimensional Array in JavaScript, the programmer must use the concept of creating the Single Dimensional Array while employing a small trick in the code.

Two-Dimensional Arrays in JavaScript are constructed by creating an array of arrays. JavaScript does not directly allow creation of a Two-Dimensional Array. Two-Dimensional Arrays in JavaScript are constructed when the inner array is created first and then, using this initial array, the outer array is then populated.

For example defining

defines 4 storage area for the array named as Exforsys. That is

A two-dimensional array can be built by defining another array on each of Exforsys[0], Exforsys[1], Exforsys[2], Exforsys[3]

This is done as follows:

This gives structure as follows:

This shows a two-dimensional array constructed using the single dimensional concept of arrays in JavaScript. The next step is adding elements to two-dimensional arrays using JavaScript.

The elements can be added to the two-dimensional array in JavaScript using double brackets. For example, to store elements in the above two dimensional array named Exforsys we write:

Thus the above two dimensional array named as Exforsys has 4*4 =16 storage spaces.