Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
Feature Requests
FAQ
Register
Log In
children vs queryselector
(version: 0)
Benchmark.js
Comparing performance of:
children vs queryselector
Created:
4 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div><custom-element></custom-element></div>
Tests:
children
const divs = document.querySelectorAll("div") Array.from(divs).map(div => { div.children[0] })
queryselector
const divs = document.querySelectorAll("div") Array.from(divs).map(div => { div.querySelector('custom-element') })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
children
queryselector
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0
Browser/OS:
Firefox 149 on Linux
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=628093" width="100%" height="500px"></iframe>
children
1.2M/s
queryselector
1.1M/s
View exact numbers
Test name
Executions per second
✓
children
1,179,913 Ops/sec
queryselector
1,099,138 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark. **Benchmark Definition** The benchmark is designed to compare two approaches: `children` and `querySelector`. The test case uses HTML with a custom element (`<custom-element>`) inside a `<div>` container. This setup allows us to focus on the differences between accessing elements using the `children` property versus the `querySelector` method. **Options Compared** The benchmark compares two options: 1. **Accessing elements using `children`:** * `const divs = document.querySelectorAll("div")` * `Array.from(divs).map(div => { div.children[0] })` 2. **Accessing elements using `querySelector`:** * `const divs = document.querySelectorAll("div")` * `Array.from(divs).map(div => { div.querySelector('custom-element') })` **Pros and Cons of Each Approach** 1. **Children approach:** * Pros: + Can be faster, since it only requires a single DOM traversal. + May be more efficient for accessing elements that are direct children of the queried element. * Cons: + Less flexible, as it's limited to direct children. + May not work if the accessed element is not a direct child (e.g., due to event listeners or other DOM modifications). 2. **QuerySelector approach:** * Pros: + More flexible, as it can access elements using any CSS selector. + Works even if the accessed element is not a direct child. * Cons: + May be slower due to additional DOM traversals. **Library and Purpose** In this benchmark, no specific library is used. However, `document.querySelectorAll()` and `Array.from()` are built-in JavaScript methods for querying the DOM. **Special JS Feature or Syntax (None)** There are no special JavaScript features or syntaxes being tested in this benchmark. **Other Alternatives** If you're interested in exploring other alternatives, here are a few: 1. **CSSOM**: You could use CSS selectors to query elements and then access their children using `children`. 2. **XPath**: Another option would be to use XPath expressions to select elements and then access their children. 3. **Custom implementation**: Depending on your specific requirements, you might want to implement a custom method for accessing child elements. Keep in mind that these alternatives may have different performance characteristics compared to the original approaches being tested in this benchmark.
Related benchmarks
JQuery: find vs selector vs scoped selector - More Html
element.children vs element.querySelectorAll vs element.querySelectorAll(:scope)
Comments
Confirm delete:
Do you really want to delete benchmark?