JS For Loops?

for_loops.js

// Setup
var array = [];
for(var i = 0; i < 1000; ++i) { array.push(i); }

var totals = {};

var log = function (id, time) {
  totals[id] = totals[id] ? totals[id] : [];
  totals[id].push(time);
};

var mean = function(array) {
  var total = 0;
  $.each(array, function (_, element) {
    total += element;
  });
  return (total / array.length);
};

var display_totals = function () {
  var i;
  $.each(totals, function(index, element) {
    // sum them up and divide by length
    console.log(mean(element));
  });
};

var benchmark = function (id, callback) {
  var diff, start = window.performance.now();
  callback.apply(this);
  diff = window.performance.now() - start;

  log(id, diff);
};
 
var run = function () {
  benchmark(1, function() { var i, length = array.length; for (i = 0; i < length; ++i) { } });
  benchmark(2, function() { $(array).each(function(index, element) { }); });
  benchmark(3, function() { $.each(array, function(index, element) { }); });
}

// Run multiple times and display mean time
var i, num = 100;
for(i = 0; i < num; ++i ) { 
  run();
}
display_totals();