Speedy Loops

example.js

var arr = ['apple', 'banana', 'cheese', 'donut', 'egg', 'fish'];

var send = function (item) {
  $.ajax({
    type: 'post',
    dataType: 'json',
    url: '/Foods/Consume',
    data: { food: item }
  });
};

// Normal for loop:

for (var i = 0, len = arr.length; i < len; i++) {
  send(arr[i]);
}

// Faster reverse while loop:

var i = arr.length;

while (i--) {
  send(arr[i]);
}

Understood, but the purpose of this post is to note that the reverse while is the fastest performing JS loop: http://blogs.oracle.com/greimer/entry/best_way_to_code_a

I would guess the for loop in reverse being slower than the while loop in reverse is due to the testing conditions, which are rather unprecise.