Question

61

How do I declare two dimensional arrays in javascript?

rated 0 times [ 65] [ 4] / answers: 1 / hits: 90661 / 12 Years ago, thu, march 15, 2012, 12:00:00

I would like to know how to declare 2 dimensional arrays in java script of fixed lengths something like,

var array = new Array[this.rows, this.columns];

after that I would like to get the length of each dimension like,

array[0].length; // I am assuming this would give me the first dimension like in C# array.GetLength(0);

array[1].length; // I am assuming this would give me the second dimension like in C# array.GetLength(1);

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2 Years ago

answered 12 Years ago jillcalistay · Accepted Answer

A quick example of what @SLaks is referring to with jagged arrays. You basically put an array in an array. The below example shows one way to make an array thats 100x100.

var arr = [];

for(var x = 0; x < 100; x++){

    arr[x] = [];    

    for(var y = 0; y < 100; y++){ 

        arr[x][y] = x*y;    

    }    

}



console.log(arr[10][11]);

Live Demo

This method is very flexible for instance arr[4] could have an array indexed to 10, and arr[5] could have an array with 1 value, or be even be a completely different type such as a string or number.