Create multidimensional array in for loop

Question

I want to create a multidimensional array like this:

array[0][1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
array[1][21,22,23,24,25,26,27....]
array[.][....]

How can I do this in Javascript?

I have tried this:

var squares = new Array();
        for(var i = 1; i <= 8; i++)
        {
            for(var j = 1; j <= 20; j++)
            {
                squares.push(i, j);     
            }

        }

How can I accomplish this?

Answer 1

You can do something like this:

var squares = new Array();
for(var i = 0; i <= 8; i++)
{
    squares[i] = new Array();
    for(var j = (i * 20) + 1; j <= 20 * i + 20; j++)
        if (squares[i] == null)
            squares[i] = j;
        else
            squares[i].push(j);
}

Output comes like:

array[0][1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
array[1][21,22,23,24,25,26,27....]

Answer 2

var array = []; // Main array
var numArrays = 10, // Number of sub-arrays
    numPerArray = 20; // Number of squares per sub-array

for(var i = 0; i < numArrays; i++){
    var subArray = [];
    // Number to start at
    var start = i * numPerArray;
    // Count up to start + numPerArray
    for(var j = start; j < start + numPerArray; j++){
        subArray.push(j);
    }
    // Add to main array
    array.push(subArray);
}

Answer 3

Use modulus operand to limit the inner array's size

var limit = 80
var inner_limit = 20
var square=[]
var inner =[]
for(var i=1;i<=limit;i++){
    inner.push(i)        
    if(i%inner_limit==0){
        square.push(inner)
        inner = []
    }

}

Answer 4

You can do it with two "for" loops. In the first loop you go through the main array and for each element add the elements from the second loop.

var arrayLength = 10; // Main array length
var limit = 20; // Number of squares
var array = [];

for ( var i = 0; i < arrayLength; i++ )
{
    array[i] = []; // Create subArray

    for( var j = 1; j <= limit; j++ )
    {
        array[i].push(j);
    }
}