World Bridge Federation new IMP to VP scale implementation in Javascript

imp2vp.js

(function(){
  var tau,
	denom;

	tau = (Math.sqrt(5)-1)/2;
	denom = 1 - Math.pow(tau, 3);

	var V = [], i=0;
	var B = 15 * Math.sqrt(8); // test for 8 Boards 

	for (var i = 0; i <= Math.ceil(B); i++) {
		V[i] = Math.min(2000, Math.round(convert(i, B)));
	};

	correct(V);
	

	function convert(margin, B){
		return (1000 + 1000 * (1.0 - Math.pow(tau, 3.0 * margin/B)) / denom);
	}

	function correct(V){
		var ok = false;
		while(!ok){
			ok = false;
			for (i = 1; i < V.length - 1; i++) {
				if ((V[i+1] - V[i]) > (V[i] - V[i-1])) {
					V[i]++;
					ok = true;
				}
			}
		}
		return V;
	}

	// print results
	for (var i = 0; i < V.length; i++) {
		var v = V[i]/100;
		console.log(i + ": " +v);
	};
})();