Recursive Bezier function

recursiveBezier.js

var recursiveBezier = function recursiveBezier(pointArray, t) {
    var P1;
    var P2;
    var inverse;
    var length = pointArray.length;
    if (length === 1) {
        return pointArray[0];
    } else {
        P1 = recursiveBezier(pointArray.slice(0,length-1), t)
        P2 = recursiveBezier(pointArray.slice(1), t);
        inverse = 1 - t;
        return {
            x: inverse * P1.x + t * P2.x,
            y: inverse * P1.y + t * P2.y
        };
    }
};