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Mr. CC - selector benchmark
(version: 0)
Comparing performance of:
ID - getElementById vs ID- querySelector vs class - querySelector vs data attr - querySelector
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<div id="a"></div> <div class="a"></div> <div data-a=""></div>
Tests:
ID - getElementById
i = 0 while(i++ < 1000) { document.getElementById('test') }
ID- querySelector
i = 0 while(i++ < 1000) { document.querySelector('#test') }
class - querySelector
i = 0 while(i++ < 1000) { document.querySelector('.test') }
data attr - querySelector
i = 0 while(i++ < 1000) { document.querySelector('[data-test]') }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
ID - getElementById
ID- querySelector
class - querySelector
data attr - querySelector
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring the performance of JavaScript selector-based DOM queries is an essential task in web development, and MeasureThat.net provides a useful platform for benchmarking various approaches. **What are we testing?** In this specific benchmark, we're measuring the performance of four different JavaScript methods for retrieving elements from the Document Object Model (DOM): 1. `document.getElementById('test')` 2. `document.querySelector('#test')` 3. `document.querySelector('.test')` 4. `document.querySelector('[data-test]')` Each test case uses a simple loop to retrieve an element 1000 times, and we're interested in measuring the execution time of each method. **Options compared** We have four options being compared: 1. **ID-based query**: Using `document.getElementById('test')` 2. **Class-based query with ID prefix**: Using `document.querySelector('#test')` (note that some browsers may not support this, as it's not a standard syntax) 3. **Class-based query without ID prefix**: Using `document.querySelector('.test')` 4. **Attribute-based query**: Using `document.querySelector('[data-test]')` **Pros and Cons of each approach:** 1. **ID-based query**: Fastest method, as it uses a direct reference to the element. However, it may not work if the ID is dynamic or not present in the DOM. 2. **Class-based query with ID prefix**: May be faster than class-based queries without an ID prefix, but its browser support is limited. 3. **Class-based query without ID prefix**: Can be slower than ID-based queries due to the additional lookup time for classes. However, it's more flexible and can handle dynamic classes. 4. **Attribute-based query**: Slowest method, as it requires checking multiple attributes (in this case, `data-test`). This approach is also less flexible and may not work if the attribute is dynamically generated. **Library usage** None of the test cases use any external libraries. **Special JS features or syntax** None mentioned in the provided benchmark definition. However, some modern JavaScript features like ES6 classes or async/await might be used in more complex benchmarks. **Other alternatives** For a more comprehensive benchmark, you could consider testing other DOM query methods, such as: * Using `document.querySelectorAll()` to retrieve multiple elements at once * Using `document.createTreeWalker()` for more control over the selection process * Using CSS selectors with attribute matching (e.g., `[data-test]`) instead of a custom attribute Keep in mind that these alternatives might not be directly relevant to this specific benchmark, but they could provide valuable insights into other aspects of DOM query performance.
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