JavaScript performance comparison

Revision 5 of this test case created

Preparation code

Benchmark.prototype.setup = function() {
    var array = [];
    var object = {};
    for (var i = 0; i < 5000; i++) {
      var key = Math.random().toString(36).substring(7);
      var value = Math.random().toString(36).substring(7);
      array.push([key, value]);
      object[key] = value;

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Testing in unknown unknown
Test Ops/sec
Iterating over array
for (i = 0, len = array.length; i < len; i++) {
  var result = array[i][0] + array[i][1];
Iterating over object's properties
for (var prop in object) {
  var result = prop + object.prop;

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