Very basic benchmarking function

benchmarking.js

function Benchmarker(count, args, that) {
  if (Object.prototype.toString.call(args) != '[object Array]') args = [args];

  function toArray() {
    var name, results = this.results, array = [];
    for (name in results) {
      array.push(name + ': ' + results[name]);
    }
    return array;
  }
  function toString() {
    var array = this.toArray();
    return array.length ? array.join('ms\n') + 'ms' : 'Please run some tests firsts';
  }
  function test(name, fn) {
    var i = count, ignore, start = new Date;
    while (i--) ignore = fn.apply(that, args);
    this.results[name] = (new Date) - start;
  }
  return {
    results: {}
    ,toString: toString
    ,toArray: toArray
    ,test: test
  };
}