gistfile1.js

/**
 * Measures the runtime for a given function.
 *
 * fn         {function} Algorithm function to be measured. First parameter is the `done` callback that should be called on termination.
 * iterations {int}      How often the function should be called
 * res        {function} Function called with the resulting runtime in ms.
 *
 * Example
 * ```javascript
 *  measureRt(function(done) {
 *    setTimeout(done, 1)
 *  }, 10, function(rt) {
 *    console.log('runtime:', rt);
 *  });
 * ```
 */
function measureRt(fn, iterations, res) {
	for(var i = 0 ; i < iterations ; i++) {
		var startDate = new Date(),
			startTs = startDate.getTime(),
			startMs = startDate.getMilliseconds();
			
		fn(function() {
			var endDate = new Date(),
				endTs = endDate.getTime(),
				endMs = endDate.getMilliseconds();
				
			var rt = (endTs * 1000 + endMs) - (startTs * 1000 + startMs)
			res(rt);
		});
	}
}