<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
<div class="test" data-attribute="test"></div>
var test = document.querySelectorAll('[data-attribute]');
var test = document.querySelectorAll('.test');
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
data attribute | |
class name |
Test name | Executions per second |
---|---|
data attribute | 918024.3 Ops/sec |
class name | 1968747.8 Ops/sec |
Let's dive into the explanation of the provided benchmark.
Benchmark Definition and Script Preparation Code
The benchmark is designed to compare two approaches for selecting elements from an HTML document using JavaScript:
document.querySelectorAll('[data-attribute]')
document.querySelectorAll('.test')
The script preparation code is empty, which means that no specific setup or initialization is required before running the benchmarks.
Html Preparation Code
The HTML preparation code creates a page with 10 elements, each having the class "test" and a data attribute "test". This setup allows us to test both approaches on the same set of elements.
Options Compared
Two options are compared:
document.querySelectorAll('[data-attribute]')
: This approach uses the [data-attribute]
pseudo-class to select elements that have a data-attribute
attribute, regardless of its value.document.querySelectorAll('.test')
: This approach uses the .test
class selector to select elements with the class "test".Pros and Cons
Here's a brief overview of each approach:
document.querySelectorAll('[data-attribute]')
document.querySelectorAll('.test')
Library
There is no explicit library used in this benchmark. However, document.querySelectorAll
is a native JavaScript method that uses the Document Object Model (DOM) to select elements.
Special JS Feature or Syntax
This benchmark does not use any special JavaScript features or syntax beyond what's required for basic DOM manipulation.
Other Considerations
When choosing between these approaches, consider the following factors:
[data-attribute]
might be a better choice..test
might be more efficient.Other Alternatives
If you want to explore alternative approaches or libraries for element selection, consider the following:
querySelector
(without the -All()
method): This method selects the first element that matches the specified CSS selector. It's not as efficient as querySelectorAll
, but can be useful for specific cases.getElementsByClassName
: This method returns a live HTMLCollection of elements with the specified class name. While it provides more context than querySelectorAll
, it can be slower and less efficient.Keep in mind that these alternatives might have different use cases, performance characteristics, or requirements for compatibility across browsers.