Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
classList.add.apply vs className += (2)
(version: 2)
For elements not yet appended to the document
Comparing performance of:
className vs classList.add
Created:
6 years ago
by:
Registered User
Jump to the latest result
Script Preparation code:
var link = document.createElement('a'); link.className = 'dropdown-item'; var classes = 'class1 class2 class3 class4 class5';
Tests:
className
link.className += ' ' + classes;
classList.add
link.classList.add.apply(link.classList, classes.split(' '));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
className
classList.add
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 provided JSON data and explain what's being tested in this JavaScript microbenchmark. **Benchmark Overview** The benchmark compares two approaches for adding classes to an HTML element: 1. `link.className += ' ' + classes` (using string concatenation) 2. `link.classList.add.apply(link.classList, classes.split(' '))` (using the `classList.add()` method with an array of classes) **What are we testing?** We're testing how these two approaches perform in terms of: * Speed: How many executions per second do each approach achieve? * Consistency: Are there any significant differences between browsers or devices? **Options compared** The benchmark is comparing the performance of two string-based methods for adding classes to an HTML element: 1. `className += ' ' + classes`: This method uses string concatenation to append new classes to the existing class list. 2. `classList.add.apply(link.classList, classes.split(' '))`: This method uses the `classList.add()` method with an array of classes split by spaces. **Pros and Cons** **1. String Concatenation (`link.className += ' ' + classes`)** Pros: * Simple to implement * Works for most use cases * No additional library dependencies required Cons: * Can lead to slower performance due to string creation and concatenation * May not be as efficient for large class lists **2. `classList.add()` method with an array of classes** Pros: * More concise and readable code * Optimized for performance in modern browsers * Supports adding multiple classes at once Cons: * Requires the `classList` API, which might not be supported in older browsers * Can be more complex to implement due to the need to split the class string into an array **Library and Special JS Features** The benchmark uses the `classList` API, which is a modern JavaScript feature introduced in HTML5. The `classList.add()` method is optimized for performance in most modern browsers. There are no special JavaScript features or syntax being tested in this benchmark. **Other Considerations** When choosing between these two approaches, consider the following factors: * Performance: If you need to add many classes to an element, the `classList.add()` method might be faster and more efficient. * Readability: If code readability is important, the `classList.add()` method can provide a more concise and readable solution. * Browser Support: Make sure your target browsers support the `classList` API. **Alternative Benchmarks** If you want to explore alternative approaches for adding classes to an HTML element, consider the following: * Using jQuery's `.addClass()` method * Implementing a custom class list management system using a JavaScript library like Lodash * Using a CSS-based approach, such as applying classes directly to the DOM element These alternatives might provide different trade-offs in terms of performance, readability, and browser support.
Related benchmarks:
setAttribute vs classList.add (attribute adding)
setAttribute vs classList.add (attribute adding) V2
ClassList add vs className +=
setAttribute vs classList.add
Comments
Confirm delete:
Do you really want to delete benchmark?