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children vs querySelectorAll scope
(version: 0)
Comparing performance of:
children vs querySelectorAll scope
Created:
2 years ago
by:
Guest
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HTML Preparation code:
<div class="container"> <ul> <li class="item">Item 1</li> <li class="item">Item 2</li> <li>Item 3</li> </ul> </div>
Tests:
children
const container = document.querySelector('.container > ul'); const items = container.children; console.log(container, items);
querySelectorAll scope
const container = document.querySelector('.container > ul'); const items = container.querySelectorAll(':scope > *'); console.log(container, items);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
children
querySelectorAll scope
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
10 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0
Browser/OS:
Firefox 139 on Windows
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Test name
Executions per second
children
124608.0 Ops/sec
querySelectorAll scope
106986.8 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested, compared, and its pros and cons. **Benchmark Definition** The benchmark definition is represented by two test cases: 1. `children`: This test case checks the performance of using the `children` property to access the child elements of an element. 2. `querySelectorAll scope`: This test case checks the performance of using the `querySelectorAll` method with the `:scope` pseudo-class to access the child elements of an element. **What is being tested?** In both test cases, a container element with three child elements is created, and then the execution time is measured for each approach. **Options compared** The two options are: 1. **Using the `children` property**: This method returns a live HTMLCollection object containing all child nodes of an element. 2. **Using `querySelectorAll` with `:scope` pseudo-class**: This method returns a NodeList or HTMLCollection object containing all elements that match the specified CSS selector within the element's scope. **Pros and Cons** 1. **Using the `children` property**: * Pros: + Simple to use. + Fast, since it returns a live collection of child nodes. * Cons: + May not be as flexible as other methods, since it only accesses child nodes. 2. **Using `querySelectorAll` with `:scope` pseudo-class**: * Pros: + More flexible than the `children` property, allowing access to all elements within a scope. + Can be used for more complex selectors. * Cons: + May have performance overhead due to the use of a pseudo-class. **Library and its purpose** There is no specific library mentioned in this benchmark. However, it's worth noting that `querySelectorAll` is a standard method provided by the W3C, and its usage is widely supported across browsers. **Special JS feature or syntax** The benchmark uses the `:scope` pseudo-class, which was introduced in CSS Selectors Level 4 (CSS3) and later adopted by JavaScript. This pseudo-class allows selecting elements within an element's scope, making it a useful tool for accessing child nodes without having to specify their exact index. **Other alternatives** If using `querySelectorAll` with the `:scope` pseudo-class is not feasible or preferred, other alternatives could include: 1. Using `getElementsByClassName` or `getElementById` with a class name that targets all child elements. 2. Using a `for` loop to iterate over child nodes. However, these alternatives may have performance overhead or limitations compared to using the `children` property or `querySelectorAll` with `:scope`. Overall, the choice between using the `children` property and `querySelectorAll` with `:scope` depends on the specific use case and requirements of your application.
Related benchmarks:
Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (jQuery 1.x)
Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (Jquery 3.3.1)
JQuery DOM Traversal vs JQuery Selectors
element.children vs element.querySelectorAll vs element.querySelectorAll(:scope)
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