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Soccer365.1
(version: 0)
Comparing performance of:
length vs hasClass vs indexOf simplest vs classList
Created:
5 years ago
by:
Guest
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HTML Preparation code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> <body id="top_page" class="x-competitions x-20 x-shedule"></body>
Tests:
length
if ($('.x-competitions').length) { }
hasClass
if ($("body").hasClass(".x-competitions")) { }
indexOf simplest
if (document.body.className.indexOf("x-competitions") !== -1) { }
classList
if (document.body.classList.contains('x-competitions')) { }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
length
hasClass
indexOf simplest
classList
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested, compared, and the pros and cons of different approaches. **Benchmark Definition** The benchmark definition represents a set of JavaScript microbenchmarks created using MeasureThat.net. It defines a script preparation code that includes an external jQuery library and a basic HTML structure for the test page. The script prepares some element with class "x-competitions" on the body. **Individual Test Cases** Each test case represents a specific benchmarking scenario: 1. `length`: Verifies if the element with class "x-competitions" exists. 2. `hasClass`: Verifies if the element with class "x-competitions" has the class "x-competitions". 3. `indexOf simplest`: Verifies if the string ".x-competitions" is found in the `className` property of the `document.body`. 4. `classList`: Verifies if the element with class "x-competitions" has a class list containing "x-competitions". **Comparison of Approaches** The test cases use different approaches to verify the existence and presence of the class: * `length`: Uses the `length` property of the jQuery object to check if an element exists. * `hasClass`: Uses the `.hasClass()` method provided by jQuery to check if an element has a specific class. * `indexOf simplest`: Uses the `indexOf()` method on the `className` property of the `document.body` to search for the string ".x-competitions". * `classList`: Uses the `.classList.contains()` method provided by modern browsers to check if an element has a specific class. **Pros and Cons** Here are some pros and cons of each approach: * `length`: + Pros: Simple, lightweight. + Cons: May not work as expected in older browsers that don't support jQuery. * `.hasClass()`: + Pros: Works with older browsers that have jQuery, but may be slower due to the method call. + Cons: Requires a library (jQuery) and can add overhead. * `indexOf simplest`: + Pros: Lightweight, doesn't require a library. + Cons: May not work as expected in some browsers, especially those with strict security policies. * `.classList.contains()`: + Pros: Works with modern browsers, fast, and lightweight. + Cons: Requires modern browser support. **Library Usage** The test cases use jQuery, which is a popular JavaScript library for DOM manipulation. jQuery provides various methods to interact with the document and elements, including `length`, `.hasClass()`, and `.classList.contains()`. **Special JS Features or Syntax** None of the provided JSON mentions any special JavaScript features or syntax. However, note that some browsers may have specific behavior or restrictions when accessing the `className` property or using modern browser methods like `.classList.contains()`. In summary, MeasureThat.net provides a convenient platform for benchmarking and comparing different approaches to verifying the existence and presence of classes on HTML elements. The test cases demonstrate various pros and cons of each approach, highlighting the importance of considering library usage, modern browser support, and lightweight code when optimizing JavaScript performance.
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