Timing arrays vs objects

HTML

<button id="btnObjs">Test Objects</button>
<button id="btnArrs">Test Arrays</button>

<div id="averages"></div>
<div id="output"></div>

JavaScript

jQuery(function($) {
      var startTime, totalTime,
      tmpName, tmpCoolness, tmpStrength,
      i = 0, out = "",
      $output = $('#output'), $averages = $('#averages'),
      iterations = 2,
      objTestCount = 0, arrTestCount = 0,
      objTestTotalTime = 0, arrTestTotalTime = 0;
  
  function testObj() {
    startTime = new Date();
    var objs = [];
    
    for(i = 0; i < iterations; i++) {
      objs.push({name: "John Doe", coolness: 84, strength: 5});
    }
    
    for(let k = 0; k<1000000; k++){
    for(i = 0; i < iterations; i++) {
      tmpName = objs[i]["name"];
      tmpCoolness = objs[i]["coolness"];
      tmpStrength = objs[i]["strength"];
    }
    }
    
    totalTime = new Date() - startTime;
    objTestTotalTime += totalTime;
    objTestCount++;
    
    log( "Object: " + totalTime );
  }
  
  function testArr() {
    startTime = new Date();
    var arrs = [];
    
    for(i = 0; i < iterations; i++) {
      arrs.push(["John Doe", 84, 5]);
    }
     for(let k = 0; k<1000000; k++){
    for(i = 0; i < iterations; i++) {
      tmpName = arrs[i][0];
      tmpCoolness = arrs[i][1];
      tmpStrength = arrs[i][2];
    }
    }
    
    totalTime = new Date() - startTime;
    arrTestTotalTime += totalTime;
    arrTestCount++;
    
    log( "Array: " + totalTime );
  }
  
  function log(msg) {
    $output.html( msg + "<br />" + $output.html() );
    $averages.html('<h3>Averages:</h3>'
        + '<p>Objects (' + objTestCount + '): ' + (objTestTotalTime/objTestCount) + '<br />'
    	+ 'Arrays (' + arrTestCount + '): ' + (arrTestTotalTime/arrTestCount) + '</p><hr />');
  }
  
  $('#btnObjs').click( testObj );
  $('#btnArrs').click( testArr );
});