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jQuery objects in for loop as var vs reference

Benchmark created by Rich on May 5, 2011

Preparation HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<p>Hidden table so it looks prettier</p>
<table id="table" style="display:none;">
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr><tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
<tr class="table-row"><td class="cell-1">apples</td><td class="cell-2">bananas</td><td class="cell-3">carrots</td><td class="cell-4">grapes</td></tr>
</table>
<script>
  var array1 = [];
  var array2 = [];
</script>

Test runner

Ready to run.

Test Ops/sec

for loop using jquery object reference

Testing in
Test	Ops/sec
for loop using jquery object reference	`for (var array1_x = 0, array1len = $('#table').children().length; array1_x < array1len; array1_x++) { var row = $($('#table').children()[array1_x]); var child1 = $(row.children()[1]), child2 = $(row.children()[2]); if (child2.length) { array1.push(child1.attr('id')); } }`	ready
for loop with jquery variable re-reference	`for (var array2_x = 0, array2len = $('#table').children().length; array2_x < array2len; array2_x++) { if ($($($('#table').children()[array2_x]).children()[2]).length) { array2.push($($($('#table').children()[array2_x]).children()[1]).attr('id')); } }`	ready

for (var array1_x = 0, array1len = $('#table').children().length; array1_x < array1len; array1_x++) {
 var row = $($('#table').children()[array1_x]);
 var child1 = $(row.children()[1]),
     child2 = $(row.children()[2]);
 if (child2.length) {
  array1.push(child1.attr('id'));
 }
}

ready

for loop with jquery variable re-reference

for (var array2_x = 0, array2len = $('#table').children().length; array2_x < array2len; array2_x++) {
 if ($($($('#table').children()[array2_x]).children()[2]).length) {
  array2.push($($($('#table').children()[array2_x]).children()[1]).attr('id'));
 }
}

ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published by Rich on May 5, 2011
Revision 2: published on October 2, 2012