js benchmark wrapper function

bench.js

var benchmarks = {};

function benchmark(f){
  return function(){
    var time, result, name = (''+f).split(/\W/,2)[1];
    time = performance.now();
    result = f.apply(this, arguments);
    time = performance.now() - time;
    if(!benchmarks[name]){
      benchmarks[name] = {
        min: time,
        max: time,
        avg: time,
        cnt: 1
      }
    }else{
      if(benchmarks[name].min > time) benchmarks[name].min = time;
      if(benchmarks[name].max < time) benchmarks[name].max = time;
      benchmarks[name].avg = (benchmarks[name].avg + time) * 0.5;
      benchmarks[name].cnt++;
    }
    return result;
  }
}

function fooTest(x){
  var r=0;
  for(var i=0; i<x; i++){ r += Math.sqrt(i); }
  return r;
}

fooTest(10000000);
benchmark(fooTest)(10000000);