hasClass-vs-is

JavaScript performance comparison

Revision 12 of this test case created

Preparation code

<span class="class1 class2 class3 class4">Element</span>
<span class="class1">Element</span>
<span class="class2">Element</span>
<span class="class3">Element</span>
<span class="class4">Element</span>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
Benchmark.prototype.setup = function() {
    var element = $('span');
};
</script>

Preparation code output

Element Element Element Element Element

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Testing in unknown unknown
Test Ops/sec
hasClass
if( element.hasClass('class1') || element.hasClass('class2') ) {
  console.log("hasClass");
}
pending…
is
if( element.is('.class1, .class2') ) {
  console.log("is");
}
pending…
match
if( element.attr('class').match(/\bclass1\b|\bclass2\b/) ) {
  console.log("match");
}
pending…
hasClass 3
if( element.hasClass('class1') || element.hasClass('class2') || element.hasClass( 'class3' ) ) {
  console.log("hasClass");
}
pending…
hasClass 4
if( element.hasClass('class1') || element.hasClass('class2') || element.hasClass( 'class3' ) || element.hasClass( 'class4' ) ) {
  console.log("hasClass");
}
pending…
is 3
if( element.is('.class1, .class2, .class3') ) {
  console.log("is");
}
pending…
is 4
if( element.is('.class1, .class2, .class3, .class4') ) {
  console.log("is");
}
pending…
match 3
if( element.attr('class').match(/\bclass1\b|\bclass2\b|\bclass3\b/) ) {
  console.log("match");
}
pending…
match 4
if( element.attr('class').match(/\bclass1\b|\bclass2\b|\bclass3\b|\bclass4\b/) ) {
  console.log("match");
}
pending…

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