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mycustomjstest4
(version: 3)
mydescription
Comparing performance of:
byId vs custom id
Created:
4 years ago
by:
Registered User
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HTML Preparation code:
<div id='text1'>text</div> <div id='text2'>text</div> <div id='text3'>text</div> <div id='text4'>text</div> <div id='text5'>text</div>
Script Preparation code:
var elements = {}; function $id(x) { if (!elements[x]) elements[x] = document.getElementById(x); return elements[x]; } $id("text1")
Tests:
byId
document.getElementById("text1");
custom id
$id("text1")
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
byId
custom id
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand what's being tested in this benchmark. **What is being tested?** The provided JSON represents two microbenchmarks, which are small pieces of JavaScript code designed to measure the performance of specific aspects of a browser or engine. In this case, we have two test cases: 1. **`byId`**: This test case measures the performance of accessing an HTML element by its ID using the `document.getElementById()` method. 2. **`custom id`**: This test case measures the performance of accessing an HTML element by a custom identifier (in this case, `$id("text1")`) implemented in the benchmark. **Options being compared** The two test cases are comparing the performance of two different approaches to access an HTML element: * `document.getElementById("text1")`: The standard method for accessing an HTML element by its ID. * `$id("text1")`: A custom implementation defined in the benchmark, which checks if the element exists before retrieving it. **Pros and Cons** **`byId` (standard method)** Pros: * Widely supported and understood by most developers. * Less complex to implement. Cons: * May involve more overhead due to DOM traversals or other operations. **`custom id` (benchmark implementation)** Pros: * May be optimized for performance, as it can avoid unnecessary DOM lookups. * Can provide a better understanding of the browser's custom identifier handling. Cons: * Less widely supported and understood by developers. * More complex to implement, especially if not part of the standard library. **Other considerations** In the benchmark setup, the `Html Preparation Code` section defines multiple HTML elements with unique IDs. The `Script Preparation Code` section defines a function `$id(x)` that checks if an element exists before retrieving it using the custom identifier. The use of this custom identifier ($id) is a clever way to test the browser's performance in handling custom identifiers, which might not be as common in everyday development but can still impact performance. **Library and purpose** There is no explicit library mentioned in the benchmark setup. However, the `document.getElementById()` method is a part of the standard JavaScript API and is widely supported by most browsers. **Special JS feature or syntax** None are explicitly mentioned in this benchmark. The custom identifier `$id` is a bespoke implementation within the benchmark itself. Now that we've broken down the benchmark, it's worth noting that there are other alternatives for measuring browser performance, such as: * Using WebAssembly (WASM) benchmarks. * Utilizing tools like Benchmark.js or Performance.js. * Creating custom benchmarks using a testing framework like Jest or Mocha. These alternatives can provide different types of metrics and insights into browser performance, depending on the specific requirements and goals of your project.
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