Benchmark: Splti vs Trim vs replace className

HTML Preparation code:

<div id="foo" class="bar test    space  OK"></div>

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

Split + filter Classname
let element = document.getElementById("foo"); let i = 1000; while (i--) { const classes = element.className.split(/\s+/g) if (classes.length) { let selector = `${classes.join('.')}`; if (selector.endsWith('.')) { selector = `.${selector.slice(0, -1)}`; } } }
Trim + replace ClassName
let element = document.getElementById("foo"); let i = 1000; while (i--) { let selector = "." + element.className.trim().replace(/\s+/g, '.'); }
No Trim - Replace CLassName
let element = document.getElementById("foo"); let i = 1000; while (i--) { let selector = "." + element.className.replace(/\s+/g, '.'); if (selector.endsWith('.')) { selector = selector.slice(0, -1); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split + filter Classname
Trim + replace ClassName
No Trim - Replace CLassName

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Windows

View result in a separate tab

Test name	Executions per second
Split + filter Classname	5821.8 Ops/sec
Trim + replace ClassName	9503.6 Ops/sec
No Trim - Replace CLassName	7192.6 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 2 months ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON file compares three different JavaScript approaches for handling and manipulating class names from a DOM element (`<div id="foo" class="bar test    space  OK"></div>`). The aim is to evaluate the performance of each approach by measuring the number of executions per second.

### Approaches Compared

1. **Split + filter Classname**
   - **Benchmark Definition**: This test case retrieves the class name of the element, splits it into an array using whitespace as the separator, and then constructs a CSS selector based on the class names.
   - **Pros**: 
     - This method accounts for multiple spaces between classes and handles them effectively.
     - The use of `split` allows precise control over how classes are interpreted.
   - **Cons**: 
     - The overhead of additional array manipulations can impact performance relative to more streamlined approaches.

2. **Trim + Replace ClassName**
   - **Benchmark Definition**: This approach trims whitespace from the start and end of the class name string and replaces every whitespace with a dot to create a concatenated selector.
   - **Pros**: 
     - This method combines the trimming and replacing actions in one streamlined operation, potentially leading to better performance compared to splitting and filtering.
     - It directly generates a valid selector string without intermediary array state.
   - **Cons**: 
     - It may not handle multiple spaces as gracefully since it only trims leading and trailing spaces rather than dealing with spaces between class names.

3. **No Trim - Replace ClassName**
   - **Benchmark Definition**: Similar to the above but without trimming leading or trailing spaces before replacing.
   - **Pros**: 
     - This method is straightforward and potentially faster due to fewer operations compared to the first test.
   - **Cons**: 
     - The final string might have leading or trailing dots if there are spaces at the ends, which would require additional handling to clean up the output.
     - It could produce invalid selectors if the class names contain extra spaces.

### Performance Results

The performance of the three approaches was tested on a specific setup and resulted in the following executions per second:

1. **Trim + replace ClassName**: 9503.58 executions/sec (fastest)
2. **No Trim - Replace ClassName**: 7192.56 executions/sec (middle)
3. **Split + filter Classname**: 5821.75 executions/sec (slowest)

### Other Considerations

When selecting one of these approaches for practical application, consider the context in which it will be used:

- **Readability and Maintainability**: Beyond raw performance, code clarity is essential. If a method is faster yet significantly less readable, it might not be the best choice for collaborative projects.
- **Edge Cases & Input Variability**: Depending on how class names are structured in your application, you might find one approach consistently better than others regarding varied input.
- **Browser Differences**: Performance can vary across different browsers, so it is wise to test in the environments that your user base predominantly uses.

### Alternatives

Besides the provided benchmarks, alternative methods could include:

- **Using `classList`:** Modern JavaScript offers the `classList` API, which provides methods like `add`, `remove`, and `toggle`, abstracting away the need for manual string manipulation and providing a cleaner interface.
- **Regular Expressions:** For more complex class name manipulations, leveraging regex might prove useful, although it could add complexity and impact performance if not used judiciously.
- **Framework Utility Functions:** Libraries like jQuery (or even modern frameworks like React/Vue) often have helper functions for class name manipulations that handle various edge cases.

In conclusion, this benchmark serves to highlight the trade-offs between performance and clarity in different JavaScript strategies for manipulating class names and invites consideration of the best fit based on specific application needs.

Related benchmarks:

Splti vs Trim vs replace className (version: 1)

Comparing performance of: Split + filter Classname vs Trim + replace ClassName vs No Trim - Replace CLassName

Created: 2 months ago by: Guest

Jump to the latest result

Split + filter Classname

Trim + replace ClassName

No Trim - Replace CLassName

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 2 months ago):