Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Teste de getElement by tag
(version: 0)
Comparing performance of:
getElementByTag vs querySelector
Created:
5 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<div></div>
Tests:
getElementByTag
document.getElementsByTagName('div')
querySelector
document.querySelector('div')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
getElementByTag
querySelector
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what is being tested, the options compared, their pros and cons, and other considerations. **What is being tested?** The provided JSON represents two microbenchmarks that measure the performance of JavaScript in testing the execution time of two different methods to select HTML elements: `getElementsByTagName` and `querySelector`. **Options compared** There are two main options being compared: 1. **`document.getElementsByTagName('div')`**: This method returns a live HTMLCollection, which is an array-like object containing all elements with the specified tag name. It's an older method that was commonly used before the introduction of more modern and efficient alternatives. 2. **`document.querySelector('div')`**: This method returns a single element or null if no element matches the specified selector. It's a more modern and efficient method that's part of the DOM API. **Pros and cons** Here are some pros and cons of each approach: * `getElementsByTagName`: + Pros: Simple, widely supported, and easy to understand. + Cons: Returns a live HTMLCollection, which can be slow and inefficient. It also returns all elements matching the tag name, even if only one element is needed. * `querySelector`: + Pros: More efficient, as it only returns the first matched element. Also, it's more flexible and allows for more complex selectors. + Cons: Requires a CSS selector syntax, which can be less intuitive for some developers. **Other considerations** * The benchmark doesn't account for other factors that might affect performance, such as: + Element size and complexity + Number of elements in the HTML document + Browser-specific optimizations or limitations **Library** There is no specific library mentioned in the provided JSON. However, `querySelector` uses the W3C DOM API, which is a widely supported standard. **Special JS feature or syntax** The benchmark uses JavaScript, which is a dynamically-typed language that's commonly used for client-side scripting on the web. The `querySelector` method requires CSS selector syntax, but no special JavaScript features are needed to use it. **Other alternatives** If you're looking for alternative methods to select HTML elements in JavaScript, some other options include: * `document.createElement('div')`: This method creates a new element with the specified tag name and returns it. * `Array.prototype.slice.call(document.getElementById('div').children)`: This method gets all child elements of an element with the ID 'div' using the `Element` API and then uses `Array.prototype.slice.call()` to convert the result to an array. Keep in mind that these alternatives might have different performance characteristics or require additional setup, so it's essential to test them thoroughly to determine which one best suits your use case.
Related benchmarks:
querySelectorAll vs getElementsByTagName 2
querySelector from document or from element
querySelectorAll vs getElementsByTagName iteration 22
querySelector vs getElementsByTagName simple select
Comments
Confirm delete:
Do you really want to delete benchmark?