Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
travel DOM2
(version: 0)
Comparing performance of:
getElementById vs firstChild
Created:
6 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<div id="app"><p id="p-1">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Error assumenda quo minima cupiditate pariatur alias eaque ipsa, ratione, eius in distinctio! Rem tempora expedita corrupti laborum autem! Vitae, odit ipsum?</p><p id="p-2">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Error assumenda quo minima cupiditate pariatur alias eaque ipsa, ratione, eius in distinctio! Rem tempora expedita corrupti laborum autem! Vitae, odit ipsum?</p><p id="p-3">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Error assumenda quo minima cupiditate pariatur alias eaque ipsa, ratione, eius in distinctio! Rem tempora expedita corrupti laborum autem! Vitae, odit ipsum?</p><p id="p-4">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Error assumenda quo minima cupiditate pariatur alias eaque ipsa, ratione, eius in distinctio! Rem tempora expedita corrupti laborum autem! Vitae, odit ipsum?</p><p id="p-5">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Error assumenda quo minima cupiditate pariatur alias eaque ipsa, ratione, eius in distinctio! Rem tempora expedita corrupti laborum autem! Vitae, odit ipsum?</p><p id="p-6">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Error assumenda quo minima cupiditate pariatur alias eaque ipsa, ratione, eius in distinctio! Rem tempora expedita corrupti laborum autem! Vitae, odit ipsum?</p><ul id="ul"><li id="li-1"><a href="#">hola</a></li><li id="li-2"><a href="#">hola</a></li><li id="li-3"><a href="#">hola</a></li><li id="li-4"><a href="#">hola</a></li><li id="li-5"><a href="#">hola</a></li><li id="li-6"><a href="#">hola</a></li><li id="li-7"><a href="#">hola</a></li><li id="li-8"><a href="#">hola</a></li><li id="li-9"><a href="#">hola</a></li><li id="li-10"><a href="#">hola</a></li></ul></div>
Tests:
getElementById
var p1 = document.getElementById('p-1'); var p2 = document.getElementById('p-2'); var p3 = document.getElementById('p-3'); var p4 = document.getElementById('p-4'); var p5 = document.getElementById('p-5'); var p6 = document.getElementById('p-6'); var ul = document.getElementById('ul'); var li1 = document.getElementById('li-1'); var li2 = document.getElementById('li-2'); var li3 = document.getElementById('li-3'); var li4 = document.getElementById('li-4'); var li5 = document.getElementById('li-5'); var li6 = document.getElementById('li-6'); var li7 = document.getElementById('li-7'); var li8 = document.getElementById('li-8'); var li9 = document.getElementById('li-9'); var li10 = document.getElementById('li-10');
firstChild
var app = document.getElementById('app') var p1 = app.firstChild; var p2 = p1.nextSibling; var p3 = p2.nextSibling; var p4 = p3.nextSibling; var p5 = p4.nextSibling; var p6 = p5.nextSibling; var ul = p6.nextSibling; var li1 = ul.firstChild; var li2 = li1.nextSibling; var li3 = li2.nextSibling; var li4 = li3.nextSibling; var li5 = li4.nextSibling; var li6 = li5.nextSibling; var li7 = li6.nextSibling; var li8 = li7.nextSibling; var li9 = li8.nextSibling; var li10 = li9.nextSibling;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
getElementById
firstChild
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):
Measuring the performance of JavaScript microbenchmarks like this one is crucial for developers to optimize their code and ensure it runs efficiently across different browsers and devices. **Benchmark Definition** The benchmark definition measures two different ways to access elements in an HTML document: 1. `getElementById`: This method uses a function call to retrieve an element by its ID. 2. `firstChild`: This method uses the `childNode` property to navigate through the DOM tree and retrieve the first child element. **Options Compared** The benchmark compares two approaches: * `getElementById`: This approach is more straightforward and efficient for retrieving elements by their unique identifier. However, it may not be as performant if there are many elements with the same ID or if the IDs are not unique. * `firstChild`: This approach traverses the DOM tree to find the first child element. While it can be useful in certain situations, it is generally less efficient than using `getElementById`. **Pros and Cons** **`getElementById`** Pros: * More efficient for retrieving elements by their unique ID * Less prone to errors due to duplicate IDs Cons: * May not work if there are multiple elements with the same ID (which is unlikely in well-structured HTML) * May not be as flexible as other methods like `firstChild` **`firstChild`** Pros: * More flexible and useful for situations where you need to traverse the DOM tree * Can handle cases where IDs are not unique Cons: * Less efficient than using `getElementById` * May be more prone to errors due to incorrect navigation in the DOM tree **Special JS Features/Syntax** There is no special JavaScript feature or syntax used in this benchmark. The code is written in standard JavaScript and uses only basic DOM traversal methods. **Other Alternatives** If you were to measure other ways of accessing elements, such as: * `getElementsByTagName`: This method returns a NodeList containing all elements with the specified tag name. * `querySelector`: This method returns an element or group of elements that match the specified CSS selector. * `querySelectorAll`: This method returns a NodeList containing all elements that match the specified CSS selector. Keep in mind that each approach has its own strengths and weaknesses, and the best choice will depend on your specific use case and requirements.
Related benchmarks:
Case Insensitive String Comparison for Sorting
replaceAll vs regex replace v2
string.replace with regex: presaved const vs inline
Javascript: Case insensitive string comparison performance 3
Comments
Confirm delete:
Do you really want to delete benchmark?