array prototype subclass

[BubikolRamios]

How would I get functionality like this to work:
it does not work that way obvious.

Array.prototype.2d.rotate = function()
{
  ....
}

Array.prototype.2d.mirror= function()
{
  ....
}
 // etc

it would work like... but that is not it.

Array.prototype.2drotate = function()
{
  ....
}

[jkd]

Property names can't begin with a number*.

* Unless you do Array.prototype["2d"].blabla

[BubikolRamios]

ok, if I leave out number

Array.prototype.twod.rotate = function()
{
  ....
}

it does not work either.

[BubikolRamios]

ok, I m getting somewhere:

call: some2dArr.twod.rotate();

now works

Array.prototype.twod = function() {}

Array.prototype.twod.rotate = function()
{
   // here it says this[0] is not defined
    ..... this[0].length
}

any suggestion ?

[jkd]

Array.prototype.twod = function() {
    var self = this;
    return {
        rotate: function() { blablbla "self" refers to the array },
        mirror: function() { blabla }
    };
};

Then [bla,bla,bla].twod().rotate() would do what you want. Not quite what you had in mind though.

Something more general might be:

function Matrix(arr) {
    this.array = arr;
}

Matrix.prototype.get = function(i,j) {
    return this.array[i][j];
};

Matrix.prototype.set = function(i,j, value) {
    return this.array[i][j] = value;
};

Matrix.prototype.rotate = function(angle) {
    // blablabla
};

// and so on

Then just use your Matrix object instead.