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asdfasdf comeon1
(version: 0)
Benchmark.js
asdf
Comparing performance of:
a1 vs a2
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div id='foo' class="lol"></div>
Tests:
a1
var element = document.getElementById("foo"); var i = 1000; var x = 0; while (i--) { if(element.classList.contains("lol")) { x++; } }
a2
var element = document.getElementById("foo"); var i = 1000; var x = 0 while (i--) { if(element.className == "lol") { x++; } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
a1
a2
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser/OS:
Chrome 120 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=492590" width="100%" height="500px"></iframe>
a1
22K/s
a2
20K/s
View exact numbers
Test name
Executions per second
✓
a1
22,399 Ops/sec
a2
20,343 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what is tested in the provided JSON benchmark. The test cases measure the performance of JavaScript code that retrieves an HTML element using `document.getElementById` and checks if it contains or has a specific class. **Comparison Options:** 1. **Contains Method (`element.classList.contains("lol")`)** vs. **Equals Method (`element.className == "lol"`) 2. **Using `contains` method**: The test case uses the `classList.contains()` method to check if the element has the class `"lol"`. This is a modern and more efficient approach, as it only checks for presence of the class, not whether it's present in the first position. 3. **Using `equals` method (`element.className == "lol"`)**: The test case uses the `className` property to compare the element's class with `"lol"`. This is an older and less efficient approach, as it checks for equality between two strings. **Pros and Cons of Each Approach:** 1. **Contains Method (`classList.contains()`)**: * Pros: More modern, efficient, and reliable. * Cons: May not work in older browsers that don't support `classList`. 2. **Equals Method (`className ==`)**: * Pros: Works in most browsers, but can be slower due to string comparison. * Cons: Less efficient, less reliable, and more prone to errors. **Library:** None explicitly mentioned in the provided code, but it's worth noting that `classList.contains()` is a part of the HTML5 API, which is supported by modern browsers. **Special JS Feature/Syntax:** The test case uses the arrow function (`=>`) for defining the while loop condition and incrementing variable. This feature was introduced in ECMAScript 2015 (ES6) and is widely supported in modern browsers. **Other Considerations:** * The test cases are designed to measure performance, so it's essential to consider factors like browser version, device platform, operating system, and hardware configuration. * The `RawUAString` field provides the raw user agent string for each browser run, which can be useful for identifying specific browsers or versions. **Other Alternatives:** If you wanted to use different approaches in your benchmarking test cases, here are some alternatives: 1. Instead of using `classList.contains()`, you could use the `indexOf()` method or a regular expression. 2. To compare class names, you could use the `split()` method or a custom function for class name manipulation. For example, to replace the original test case with one using `indexOf()`: ```javascript while (i--) { if (element.className.indexOf("lol") != -1) { x++; } } ``` Keep in mind that these alternatives might affect performance and accuracy of your benchmarking results.
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