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joined classes jquery
(version: 0)
does joining more classes to a selector make it less performant?
Comparing performance of:
single class - getElementsByClassName? vs two classes vs three classes
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<div class='test1'> <div class='test-child1 child1 child'></div> </div> <div class='test2'> <div class='test-child2 child2 child'></div> </div> <div class='test3'> <div class='test-child3 child3 child'></div> </div> <div class='test4'> <div class='test-child4 child4 child'></div> </div> <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
Tests:
single class - getElementsByClassName?
jQuery('.test-child4')
two classes
jQuery('.test-child4.child4')
three classes
jQuery('.test-child4.child4.child')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
single class - getElementsByClassName?
two classes
three classes
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Overview** The benchmark is designed to measure the performance of jQuery's `getElementsByClassName()` method under different conditions. Specifically, it tests how joining multiple classes to a selector affects performance. **Script Preparation Code** The script preparation code for this benchmark is empty (`null`). This means that no additional JavaScript code is executed before running the test cases. **Html Preparation Code** The HTML preparation code defines four identical `<div>` elements with different class names: `test1`, `test2`, `test3`, and `test4`. The class names have multiple levels of nesting, such as `child1`, `child2`, etc. These elements are used as targets for the jQuery selector tests. **Individual Test Cases** There are three test cases: 1. **Single Class - getElementsByClassName?**: Tests how fast jQuery can find an element with a single class name (`class='test-child4'`). 2. **Two Classes**: Tests how fast jQuery can find an element with two class names combined (`class='test-child4 child'`). 3. **Three Classes**: Tests how fast jQuery can find an element with three class names combined (`class='test-child4.child child'`). **Library: jQuery** The library being used is jQuery, a popular JavaScript library for DOM manipulation and event handling. In this benchmark, jQuery's `getElementsByClassName()` method is the focus of performance testing. **Pros and Cons of Different Approaches** Here are some pros and cons of different approaches: * **Single Class**: This approach tests the fastest way to select an element with a single class name. + Pros: Simple, straightforward test case. + Cons: May not reflect real-world scenarios where multiple classes are used. * **Two Classes**: This approach tests how fast jQuery can handle two class names combined. + Pros: More realistic than single-class test, as it reflects common use cases. + Cons: May be slower due to additional complexity. * **Three Classes**: This approach tests the fastest way to select an element with three class names combined. + Pros: Similar to the two-classes test, but with more nesting levels. + Cons: May be even slower than the two-classes test. **Other Considerations** When interpreting these results, consider that: * The benchmark is running on a desktop device (Mac OS X 10.15.7) with Chrome 94 browser. * The test cases are designed to measure performance under different conditions, rather than accuracy or code quality. **Alternatives** If you're interested in exploring other benchmarks or testing libraries, consider the following alternatives: * Browserbench: A benchmarking platform that tests various web technologies, including JavaScript and DOM manipulation. * jsPerf: A web-based benchmarking tool specifically designed for measuring JavaScript performance. * Benchmarking frameworks like Benchmark.js or Fast-est: These tools allow you to create custom benchmarks for your specific use cases.
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