val() vs append() jquery

JavaScript performance comparison

Revision 3 of this test case created by gnarf

Info

which is faster when dealing with a kind of large textarea and growing

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<textarea>lorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsum</textarea>
<script>
Benchmark.prototype.setup = function() {
    var $textarea = $('textarea');
   
    var newvalue = 'lorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsumlorem ipsum';
   
    $textarea.val( newvalue );
};
</script>

Preparation code output

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
val

$textarea.val(function( index, value ) {
  return value + newvalue;
});
pending…
append()

$textarea.append(newvalue);
pending…
.value +=
$textarea[0].value += newvalue;
pending…

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