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Class vs Attribute selector modern
(version: 0)
Comparing performance of:
Class selector vs Attribute selector
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<input type="text" class="search" data-search-input/> <div class="results" data-results> <div class="element" data-result-element>Hello</div> <div class="element" data-result-element>World</div> <div class="element" data-result-element>Everyone</div> </div>
Tests:
Class selector
let list = document.querySelector('.results'); let list_item = document.querySelector('.element'); let input = document.querySelector('.search');
Attribute selector
let list = document.querySelector('[class="results"]'); let list_item = document.querySelector('[class="element"]'); let input = document.querySelector('[class="search"]');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Class selector
Attribute selector
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one month ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36
Browser/OS:
Chrome 146 on Mac OS X 10.15.7
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Test name
Executions per second
Class selector
11198585.0 Ops/sec
Attribute selector
4492854.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested, compared, and their pros/cons. **Benchmark Definition** The benchmark definition is a set of instructions that defines how to prepare the environment for testing. In this case, it includes: * A script preparation code: This section is empty, which means no custom JavaScript code needs to be executed before running the tests. * An HTML preparation code: This section defines an HTML page with three elements: `input` (a text input), `list` (an element with class `results`), and multiple `element` elements (each with class `element`). The presence of these elements is expected during testing. **Individual Test Cases** There are two test cases defined: 1. **Class selector** * Benchmark Definition: `let list = document.querySelector('.results'); let list_item = document.querySelector('.element'); let input = document.querySelector('.search');` * Description: This test case uses the `querySelector` method to select elements based on their class names. 2. **Attribute selector** * Benchmark Definition: `let list = document.querySelector('[class="results"]'); let list_item = document.querySelector('[class="element"]'); let input = document.querySelector('[class="search"]');` * Description: This test case uses the `querySelector` method with attribute selectors to select elements based on their class attributes. **Comparison and Pros/Cons** Both test cases use the `querySelector` method, which is a part of the Document Object Model (DOM). However, they differ in how they specify the selector: * **Class selector**: Uses dot notation (`.`) followed by the class name. This approach is more readable and concise. + Pros: Easier to read and maintain, especially for smaller classes or attributes. + Cons: May be slower due to the DOM query optimization algorithm (e.g., using caching). * **Attribute selector**: Uses square brackets `[]` followed by the attribute name and value. This approach is more flexible but also more verbose. + Pros: Can match elements based on any attribute, regardless of its position or order in the HTML document. + Cons: May be slower due to the DOM query optimization algorithm and can lead to more complex selectors. **Library** There is no explicit library mentioned in the provided data. However, the `querySelector` method is part of the W3C standard and is widely supported by most modern browsers. **Special JS Features/Syntax** None are explicitly mentioned in this specific benchmark definition. However, note that if you were to create a new test case or benchmark using these methods, you might use more advanced techniques like: * Using `getAttribute` and `setAttribute` instead of attribute selectors for more fine-grained control. * Utilizing CSS selectors, such as `querySelectorAll`, for more complex selection logic. * Leveraging the `DOMQuerySelectorOptions` interface for custom query optimizations. **Other Alternatives** If you wanted to test different approaches or libraries, consider exploring: * Other DOM query methods like `getElementsByClassName` or `getElementById`. * CSS selectors for more precise and flexible element selection (e.g., using `querySelectorAll`). * Browser-specific APIs like `window.getComputedStyle` for CSS styles or attribute access. * Library-based solutions like jQuery or other utility libraries that provide a more convenient, high-level API for DOM manipulation. Keep in mind that the choice of approach depends on your specific requirements and performance considerations.
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