Javascript template specialisation.

template specialisation

function GenMatrix(rows, cols) {
    function Matrix() {
        // Whatever prefered way of storing you may have.
        this.nums = new Array(rows * cols);
    }
    
    if(rows == 2 && cols == 2) {
        Matrix.prototype.inverse = function() {
             // optimize matrix inverse code for 2x2
        }
    } else {
        Matrix.prototype.inverse = function() {
             // The generic inverse logic.
        }
    }
    
    return Matrix;
}

var M33 = GenMatrix(3, 3);
var M22 = GenMatrix(2, 2);

var m33 = new M33();
m33.inverse(); // calls generic inverse method.

var m22 = new M22(); 
m22.inverse(); // calls specialized inverse for 2x2 matrices.