mockup perf tool

mockperf.js

var perf = (function(root) {

  var keys = [];
  var i = -1;

  // internal api
  function setter() {
    if (i > -1) {
      keys[i].stop = new Date().getTime();
      keys[i].dist = keys[i].stop - keys[i].start;
    }
  }

  // public api to get own key
  function getter() {
    return (i > -1 ? keys[i] : false);
  }

  // public api get distance of
  // time between start & stop
  function distance() {
    return keys[i].stop - keys[i].start;
  }

  // public api to expose current size of
  // keys within scope
  function size() {
    return keys.length;
  }

  // shim, because lame browsers exist in
  // the wild
  function index(key) {
    for (var i=0;i<keys.length;++i) {
      if (keys[i].name === key) return i;
    }
    return -1;
  }

  return function (key) {

    if (typeof key == 'undefined') return keys;

    i = index(key);

    // internal api
    function build() {
      keys.push({
        name: key,
        start: new Date().getTime(),
        stop: null
      });
    }

    // tracking fn, toggles from start/stop
    function track() {
      return (i > -1 ? setter() : build());
    }

    return {
      start: track,
      stop: track,
      delay: distance,
      key: getter
    }
  }

})(window);

mockperf.min.js

var perf=function(){function d(){c>-1&&(b[c].stop=(new Date).getTime(),b[c].dist=b[c].stop-b[c].start)}function e(){return c>-1?b[c]:!1}function f(){return b[c].stop-b[c].start}function h(a){for(var c=0;c<b.length;++c)if(b[c].name===a)return c;return-1}var b=[],c=-1;return function(a){function g(){b.push({name:a,start:(new Date).getTime(),stop:null})}function i(){return c>-1?d():g()}return"undefined"==typeof a?b:(c=h(a),{start:i,stop:i,delay:f,key:e})}}(window);

perf('someTestName').start();
perf('someTestName').stop();
perf('someTestName').delay();