Benchmark: Regex detecting whitespace vs trim

Script Preparation code:

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

Tests:

regex
/\S/.test(string)
trim
string.trim()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
trim

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
regex	20689008.0 Ops/sec
trim	22191224.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this JavaScript benchmark.

**Benchmark Goal**
The goal of this benchmark is to compare the performance of two approaches: using a regular expression (`/\\S/.test(string)`) and using the built-in `trim()` function. Both methods aim to detect whitespace in a given string.

**Test Cases**

1. **Regex**: This test case uses the `/\\S/.test(string)` syntax, which is a regular expression that matches any non-whitespace character (`\S` represents "non-space") and then tests if the result is true (`.test()` returns `true` if the search finds at least one match).
2. **Trim**: This test case uses the `string.trim()` function, which removes whitespace from both ends of the string.

**Options Compared**

The two approaches differ in their behavior:

* **Regex**: The regular expression approach checks each character individually, which can lead to slower performance for longer strings.
* **Trim**: The `trim()` function is a built-in method that uses a more efficient algorithm to remove whitespace. It's generally faster and more optimized.

**Pros and Cons**

1. **Regex**:
	* Pros: Can be used for more complex string processing, and can be easily extended or modified.
	* Cons: Slower performance due to the need to check each character individually.
2. **Trim**:
	* Pros: Generally faster and more optimized, making it suitable for most use cases.
	* Cons: Limited flexibility compared to regular expressions.

**Library Usage**
None of the test cases explicitly uses a library, but the `trim()` function is a built-in method of JavaScript's String prototype.

**Special JS Features or Syntax**
There are no special features or syntax used in this benchmark. It only relies on standard JavaScript constructs.

**Alternatives**

If you were to implement a similar benchmark for other string processing methods, some alternatives could include:

1. Using `string.replace()` with a whitespace removal regex.
2. Implementing a custom whitespace removal function using loops and conditional statements.
3. Comparing the performance of different encoding schemes or string normalization methods.

Keep in mind that these alternatives might not be as optimized as built-in methods like `trim()`, but they could provide interesting insights into specific use cases or requirements.

Related benchmarks:

Regex detecting whitespace vs trim (version: 0)

Comparing performance of: regex vs trim

Created: 5 years ago by: Guest

Jump to the latest result

regex

trim

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):