A class to perform Lagrange polynomial interpolation from a set of points

lagrangepolynomial.js

var LagrangePolynomial = (function(points){
    var cc = {};
    cc.points = points;
    cc.calc = (function(x){
        var n = this.points.length;
        var y = 0.0;
        var j = 0;
        var k = 0;
        var Lx = 1.0;
        for (j = 0; j < n; ++j) {
            Lx = 1.0;
            for (k = 0; k < n; ++k) {
                if (k != j) {
                    Lx = Lx * (x - this.points[k].x) / (this.points[j].x - this.points[k].x);
                }
            }
            y = y + this.points[j].y * Lx;
        }
        return y;
    });
    return cc;
});