Test benchmarks

test.js

var o = {};
for (var i = 0; i < 100; i++) {
  o['key' + i] = 'value ' + i;
}

exports.compare = {
  //#3
  "for(var .. in ..)" : function () {
    for(var key in o) {
      test(key, o[key]);
    }
  },

  //#4
  "for(var .. in ..) OwnProperty" : function () {
    for(var key in o) {
      if (o.hasOwnProperty(key)) {
        test(key, o[key]);
      }
    }
  },
  // #1
  "Object.keys" : function () {
    var keys = Object.keys(o);
    for(var i = 0; i < keys.length; i++) {
      test(keys[i], o[keys[i]])
    }
  },
  // #2
  "Object.keys ForEach" : function () {
    var keys = Object.keys(o);
    keys.forEach(function (key) {
      test(key, o[key]);
    })
  },
};

function test(key, val) {}

require("bench").runMain()