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jQuery vs querySelector for classes
(version: 0)
Comparing speed of getting element by id with jQuery vs Vanilla JS with getElementById and querySelector
Comparing performance of:
jQuery vs querySelector
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script> <div id="testElement" class="test class list classes"></div>
Tests:
jQuery
var el = $(".classes")[0];
querySelector
var el = document.querySelector(".classes");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
jQuery
querySelector
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one month ago
)
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Mobile/15E148 Safari/604.1
Browser/OS:
Mobile Safari 26 on iOS 18.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=630029" width="100%" height="500px"></iframe>
querySelector
14.9M/s
jQuery
5.1M/s
View exact numbers
Test name
Executions per second
✓
querySelector
14,913,664 Ops/sec
jQuery
5,080,280 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its results. **Benchmark Description** The benchmark is designed to compare the speed of two approaches for selecting an element by its class in JavaScript: 1. **jQuery**: The jQuery library provides a convenient way to select elements using CSS selectors, including classes. 2. **Vanilla JS with getElementById and querySelector**: This approach uses the `getElementById` method (which doesn't work here since there's no id) and then queries the resulting element using the `querySelector` function. **Options Compared** The benchmark compares two options: 1. **jQuery**: Uses the jQuery library to select elements by class. 2. **Vanilla JS with getElementById and querySelector**: Uses the native JavaScript functions `getElementById` (not used here) and `querySelector`. **Pros and Cons of Each Approach** * **jQuery**: + Pros: - Easy to use and convenient for common use cases. - Reduces boilerplate code. + Cons: - Adds an extra dependency (the jQuery library). - May have performance overhead due to the abstraction layer. * **Vanilla JS with getElementById and querySelector**: + Pros: - No additional dependencies beyond native JavaScript functions. - Can be optimized for performance. + Cons: - Requires manual CSS selector parsing and execution, which can add complexity. - May require more boilerplate code. **Library: jQuery** jQuery is a popular JavaScript library that simplifies DOM manipulation and event handling. In this benchmark, it's used to select elements by class using the `$(selector)` syntax. The library provides an abstraction layer over the native browser functionality, making it easier to work with elements. **Special JS Feature or Syntax** This benchmark doesn't use any special JavaScript features or syntax beyond CSS selectors and native functions like `querySelector`. However, some versions of JavaScript (like ECMAScript 2015+) might offer newer APIs for selecting elements by class, such as `classList` on DOM elements. **Other Alternatives** If you need to select elements by class in a JavaScript context without using jQuery or vanilla JS with `querySelector`, consider the following alternatives: 1. **Sizzle**: A CSS selector engine that's similar to jQuery's selector parsing algorithm. 2. **Query.js**: Another lightweight CSS selector library for JavaScript. 3. **DOM Traversals**: You can also use native DOM traversal methods, such as `NodeList.prototype.item` or `Array.prototype.forEach`, to iterate over elements and find matches. Keep in mind that each of these alternatives has its own trade-offs and performance characteristics, so choose the one that best fits your needs.
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