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test bench mark
(version: 0)
Comparing performance of:
querySelectorAll vs getElementsByClassName
Created:
6 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div> <div class="test"></div>
Tests:
querySelectorAll
document.querySelectorAll(".test")
getElementsByClassName
document.getElementsByClassName(".test")
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
querySelectorAll
getElementsByClassName
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Understanding the Benchmark** The provided JSON represents a JavaScript microbenchmarking test created on MeasureThat.net. The benchmark tests two individual functions: `document.querySelectorAll()` and `document.getElementsByClassName()`. These functions are used to retrieve elements from a DOM (Document Object Model) using CSS selectors. **What is being tested?** * `document.querySelectorAll()`: This function returns an HTMLCollection of all elements that match the specified selector. * `document.getElementsByClassName()`: This function returns an HTMLCollection of all elements with the specified class name. **Comparison Options** The benchmark compares two approaches to achieve these functions: 1. **Native DOM methods**: Using native JavaScript methods to access the DOM, which are implemented in the browser's engine (e.g., V8 in Chrome). 2. **Library-based solutions**: Using external libraries or polyfills to implement these functions. **Pros and Cons of each approach:** 1. **Native DOM methods**: * Pros: + Typically faster and more efficient. + Lower memory usage. + Less overhead compared to library-based solutions. * Cons: + May not be compatible with older browsers or systems. + Requires a browser engine that supports these functions (e.g., V8 in Chrome). 2. **Library-based solutions**: * Pros: + More portable and compatible across different browsers and systems. + Easier to maintain and update for compatibility issues. * Cons: + May introduce additional overhead, affecting performance. + Requires loading an external library. **Libraries used** In this benchmark, the library `jsdom` is not explicitly mentioned in the provided JSON. However, it's likely that the `document.querySelectorAll()` and `document.getElementsByClassName()` functions are using the native implementation of these methods, which might be polyfilled by libraries like jsdom or other implementations. **Special JavaScript features or syntax** There are no special JavaScript features or syntaxes used in this benchmark. The code is straightforward and uses only standard JavaScript functions and DOM methods. **Other alternatives** If you're looking for alternative approaches to benchmarking JavaScript performance, consider: 1. **Benchmarking frameworks**: Tools like Benchmark.js, jsperf, or Benchmarklib provide a structured approach to writing benchmarks. 2. **Browser-specific benchmarks**: Some browsers, like Chrome or Firefox, have built-in benchmarking tools that allow you to compare the performance of different scripts. 3. **Node.js benchmarks**: If you're targeting Node.js, consider using libraries like Benchmark.js or jsbench.me to create and run benchmarks. In summary, this benchmark tests the performance difference between native DOM methods and library-based solutions for two common JavaScript functions: `document.querySelectorAll()` and `document.getElementsByClassName()`.
Related benchmarks:
querySelectorAll vs getElementsByClassName x2
querySelectorAll vs. getElementsByClassName x 10
performance js elements selector
querySelector vs querySelectorAll simple (single element result)
JS selector functions
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