How to declare an empty multidimensional array in JavaScript?

Question

My JavaScript code needs looping to declare a multidimensional array. Is there a best way to replace it?

My magic square:
https://code.sololearn.com/WBwWcTsdjxcd/?ref=app

Answer 1

Javascript doesn't need formal declaration like C# or other strongly typed languages. Multidimensional arrays are just nested arrays.

My first piece of advice is to do yourself a favor and use descriptive variable names. That code is really hard to read, and while you're in it, it might make sense; six months from now you'll go back and just be lost.

I've created a code to hopefully better explain multidimensional arrays in javascript. There's also an example pattern you can experiment with in the JS panel.
https://code.sololearn.com/Wn75Hc7jTOZw#js

Answer 2

up vote
0
down vote
A nested 3x3 array (of undefined):

var arr = new Array(3);
for (var i = 0; i < arr.length; ++i) {
arr[i] = new Array(3);
}

console.log(arr);

Answer 3

Reminder, this is a JavaScript discussion, not Java.

Answer 4

let width=5;
let height=5;
let emptyArray = [...Array(height)].map(e => Array(width).fill(0));
alert(emptyArray );

Answer 5

Maulik, I don't think it works like that in javascript 😅

Answer 6

how do u code this

like what should I get in place first

Answer 7

To declare a Two Dimensional Array in Java, you can use either

data_type[][] array_name = new data_type[SIZE][SIZE] ;

(or)

data_type array_name[][] = new data_type[SIZE][SIZE] ;

Answer 8

TO DECLARE TWO DIMANTION ARRAY IN JAVA
I.E TWO DIMANTION ARRAY
DATA TYPE[SIZE][SIZE]=new DATA TYPE

Answer 9

i told in java not java script..

Answer 10

it doesn't happen in JavaScript

Answer 11

do you know how big the multidimensional array will be?