jQuery $( '.class' ) vs getElementsByClassName( 'class' )

JavaScript performance comparison

Revision 8 of this test case created by

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div class="class1" id="id1"></div>
<div class="class2" id="id2"></div>
<div class="class3" id="id3"></div>
<div class="class4" id="id4"></div>
<div class="class5" id="id5"></div>
<div class="class6" id="id6"></div>
<div class="class7" id="id7"></div>
<div class="class8" id="id8"></div>
<div class="class9" id="id9"></div>
<div class="class10" id="id10"></div>
<div class="class11" id="id11"></div>
<div class="class12" id="id12"></div>
<div class="class13" id="id13"></div>
<div class="class14" id="id14"></div>
<div class="class15" id="id15"></div>
<div class="class16" id="id16"></div>
<div class="class17" id="id17"></div>
<div class="class18" id="id18"></div>
<div class="class19" id="id19"></div>
<div class="class20" id="id20"></div>
<div class="class21" id="id21"></div>
<div class="class22" id="id22"></div>
<div class="class23" id="id23"></div>
<div class="class24" id="id24"></div>
<div class="class25" id="id25"></div>
<div class="class26" id="id26"></div>
<div class="class27" id="id27"></div>
<div class="class28" id="id28"></div>
<div class="class29" id="id29"></div>
<div class="class30" id="id30"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
    

Preparation code output

<div class="class1" id="id1"></div> <div class="class2" id="id2"></div> <div class="class3" id="id3"></div> <div class="class4" id="id4"></div> <div class="class5" id="id5"></div> <div class="class6" id="id6"></div> <div class="class7" id="id7"></div> <div class="class8" id="id8"></div> <div class="class9" id="id9"></div> <div class="class10" id="id10"></div> <div class="class11" id="id11"></div> <div class="class12" id="id12"></div> <div class="class13" id="id13"></div> <div class="class14" id="id14"></div> <div class="class15" id="id15"></div> <div class="class16" id="id16"></div> <div class="class17" id="id17"></div> <div class="class18" id="id18"></div> <div class="class19" id="id19"></div> <div class="class20" id="id20"></div> <div class="class21" id="id21"></div> <div class="class22" id="id22"></div> <div class="class23" id="id23"></div> <div class="class24" id="id24"></div> <div class="class25" id="id25"></div> <div class="class26" id="id26"></div> <div class="class27" id="id27"></div> <div class="class28" id="id28"></div> <div class="class29" id="id29"></div> <div class="class30" id="id30"></div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
$('.class')
for ( var i = 1; i <= 30; i++ ) 
{

  var x = $( '.class' + i );

};
pending…
getElementsByClassName('class')
for ( var i = 1; i <= 30; i++ ) 
{

  var x = document.getElementsByClassName( 'class' + i );

};
pending…
$('#id')
for ( var i = 1; i <= 30; i++ ) 
{

  var x = $( '#id' + i );

};
pending…
document.getElementById
for ( var i = 1; i <= 30; i++ ) 
{

  var x = document.getElementById('id' + i);

};
pending…

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Revisions

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