Simple averaging profiler

gistfile1.js

function ProfilingTimer() {
	this.currentStart = null;
	this.times = [];
	this.index = 0;
}

ProfilingTimer.prototype.start = function() {
	this.currentStart = new Date().getTime();
};

ProfilingTimer.prototype.stop = function() {
	this.times[this.index] = new Date().getTime() - this.currentStart;
	this.index = (this.index + 1) % 60;
};

ProfilingTimer.prototype.infoString = function() {
	var min = this.times[0], max = min, ave = min;
	for (var i = 1 ; i < this.times.length; i++) {
		var t = this.times[i];
		if (t < min) min = t; else if (t > max) max = t;
		ave += t;
	}
	ave /= this.times.length;
	return 'ave=' + ave.toFixed(1) + ', range=' + min + '-' + max;
};