Benchmark: Regex removing whitespace vs trimEnd

Script Preparation code:

var string = '    fsajdf asdfjosa fjoiawejf oawjfoei jaosdjfsdjfo sfjos 2324234 sdf safjao j o        sdlfks dflks l      '

Tests:

regex
string.replace(/\s+$/g, '')
trimEnd
string.trimEnd()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
trimEnd

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Overview**

The benchmark is designed to compare two different approaches for removing whitespace from a string: using regular expressions (regex) and the `trimEnd()` method.

**Test Cases**

There are two test cases:

1. **Regex**: The first test case uses the regex pattern `\s+` to match one or more whitespace characters (`\s`) at the end of the string (`$`). The `g` flag is used to perform a global search, ensuring that all occurrences of whitespace are removed.
2. **trimEnd()**: The second test case uses the `trimEnd()` method, which removes whitespace characters from the end of the string.

**Library Used**

In this benchmark, no external library is explicitly mentioned. However, it's worth noting that both regex and `trimEnd()` methods rely on built-in JavaScript functionality.

**Special JS Feature/Syntax (None)**

There are no special JavaScript features or syntax used in this benchmark.

**Benchmark Preparation Code**

The preparation code for the benchmark is a sample string with intentional whitespace characters at the end:
```javascript
var string = '    fsajdf asdfjosa fjoiawejf oawjfoei jaosdjfsdjfo sfjos 2324234 sdf safjao j o        sdlfks dflks l      ';
```
**Comparison of Options**

The two test cases compare the performance of removing whitespace from a string using:

1. **Regex**: This approach is more flexible, as it can match various types of whitespace characters (e.g., spaces, tabs, line breaks). However, regex patterns can be slower and more resource-intensive than native methods like `trimEnd()`.
2. **trimEnd()**: This approach is faster and more lightweight, as it only removes whitespace characters from the end of the string. However, it may not work with all types of whitespace characters.

**Pros and Cons**

**Regex (string.replace(/\\s+$/, ''))**

Pros:

* Flexible: can match various types of whitespace characters
* Can be used for more complex string manipulation

Cons:

* Slower and more resource-intensive than native methods like `trimEnd()`
* May require additional configuration or maintenance to work correctly with all types of whitespace characters

**trimEnd()**

Pros:

* Faster and more lightweight
* Only removes whitespace characters from the end of the string

Cons:

* Limited flexibility: only works for removing whitespace from the end of a string
* May not work correctly with non-ASCII whitespace characters (e.g., Unicode whitespace characters)

**Other Considerations**

When choosing between regex and `trimEnd()`, consider the specific requirements of your use case. If you need to remove various types of whitespace characters or perform more complex string manipulation, regex might be a better choice. However, if you're looking for a lightweight, fast solution that only removes whitespace from the end of a string, `trimEnd()` is likely a better option.

**Alternatives**

Other alternatives to removing whitespace from a string include:

* Using the `replace()` method with a different pattern (e.g., `\t`, `\n`)
* Using a library like jQuery's `trim()` method
* Implementing custom string manipulation functions using JavaScript

Keep in mind that each of these alternatives may have their own pros and cons, depending on your specific use case.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/116.0

Browser/OS: Firefox 116 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
regex	4011691.5 Ops/sec
trimEnd	49648384.0 Ops/sec

Related benchmarks:

Regex removing whitespace vs trimEnd (version: 0)

testing removing end whitespace vs trimEnd

Comparing performance of: regex vs trimEnd

Created: one year ago by: Guest

Jump to the latest result

regex

trimEnd

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):