JS Benchmark using Gauss–Legendre

pi.js

(function(){
	"use strict";

	var n = 100000,

	init = function(){
		return {
			a : 1,
			b : 1 / Math.sqrt(2),
			t : 1 / 4,
			p : 1,

			iter : function(){
				var ca = this.a;

				this.a = (this.a + this.b) / 2;
				this.b = Math.sqrt(ca * this.b);
				this.t = this.t - (this.p * Math.pow(ca - this.a, 2));
				this.p = 2 * this.p;

				return;
			},

			getPi : function(){
				return Math.pow(this.a + this.b, 2) / (4 * this.t);
			}
		};
	},

	d = new Date();

	(function(){
		var i = 0, j = 0, pi = {};

		for(i = 0; i < n; i += 1){
			pi = init();

			for(j = 0; j < 1000; j += 1){
				pi.iter();
			}

			pi.getPi();
		}
	})();

	console.log(new Date().getTime() - d.getTime());
})();