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Accepted
Ruslan López
Asked: 2020-05-03 13:13:48 +0800 CST 2020-05-03 13:13:48 +0800 CST

How to declare a square array in javascript?

  • 772

I have a program that is giving me undefinedbecause I misdefined my multidimensional array.

In Java I would do it like this:

int[][] array=new int[][] {{1, 2}, {3, 4}};
final int filas = array.length;
final int columnas = array[0].length;
int[][] returnedArray = new int[columnas][filas];

but in javascript I don't know how to do it.

This is what I have tried:

var array=[[1, 2], [3, 4]];
var returnedArray = [[columnas],[filas]];
var returnedArray = [[columnas,filas]];
var returnedArray = [];

but any attempt to fill the indexes of the returnedArrayis failing me.

Thanks in advance.

javascript

2 Answers

  1. Best Answer

    Assuming you want to create a 2*2 matrix, you can do it like this:

    var matrix = [];
for(var i=0; i<columnas; i++) {
    matrix[i] = new Array(filas);
}

    for the particular case the closest thing would be

    var returnedArray = [];
for(var i=0; i<columnas; i++) {
 returnedArray[i] = new Array(filas);
}
    • 4

  2. You can achieve it in the following way;

        var arreglo = [
      ['posicion1', 'posicion2']
    ];
    console.log(arreglo [0][0]);

    You can also create an object;

        
    var myObj = { 
    fred: { apples: 2, oranges: 4, bananas: 7, melons: 0 }, 
    mary: { apples: 0, oranges: 10, bananas: 0, melons: 0 }, 
    sarah: { apples: 0, oranges: 0, bananas: 0, melons: 5 } 
}
console.log(myObj.fred);

    • 3