Benchmark: String split using regex vs string v2

Script Preparation code:

var string = 'salut comment ca  va moi test pa adsk ldsj dkjasb kdaj akdajkda     dkna dlkas mas '

Tests:

Split by regex
var res = string.split(/\btest\b/)
Split by string
var str = string.split(' ') var res = [] for (var i = 0; i < str.length; i++) { var s = str[i].trim() if (s) { res.push(s) } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split by regex
Split by string

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36 Edg/140.0.0.0

Browser/OS: Chrome 140 on Windows

View result in a separate tab

Test name	Executions per second
Split by regex	13066844.0 Ops/sec
Split by string	5231912.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark tests two ways to split a string: using regular expressions (regex) and using the `split()` method with a string separator. The test cases are designed to measure the performance difference between these two approaches.

**Options Compared**

1. **Regex Split**: Uses the `/\\btest\\b/` regex pattern to match and split the string at occurrences of the word "test". This approach is more flexible and can handle edge cases, but it's also slower.
2. **String Split**: Uses the `split()` method with a string separator (" ") to split the input string into an array of words.

**Pros and Cons**

1. **Regex Split**:
	* Pros: Can handle edge cases like word boundaries (`\\b`), escaping special characters (`/`), and matching multiple occurrences.
	* Cons: Slower due to the complexity of regex processing, which involves compiling a pattern and executing it at runtime.
2. **String Split**:
	* Pros: Faster since it's a built-in method that can be optimized by the JavaScript engine.
	* Cons: Less flexible and may not handle edge cases like whitespace trimming.

**Library Used**

None explicitly mentioned in this benchmark, but both approaches rely on built-in JavaScript methods and libraries. The `split()` method is a part of the standard JavaScript library.

**Special JS Feature or Syntax**

There's no specific JavaScript feature or syntax being tested here. Both test cases use basic JavaScript syntax for string manipulation.

**Other Considerations**

* **Performance**: As mentioned earlier, the regex split approach is slower than the string split approach.
* **Readability**: The code readability might be affected by the choice of splitting method. Regex patterns can be cryptic and harder to understand, while the `split()` method is more straightforward.
* **Maintainability**: If the input data changes frequently or requires complex processing, using a regex pattern might make the code harder to maintain.

**Other Alternatives**

If you need to split strings in other ways, some alternative approaches include:

1. Using a library like `lodash.string` for more advanced string manipulation techniques.
2. Implementing your own custom splitting logic using loops and conditional statements.
3. Exploring other regex patterns or syntax options that better suit your specific use case.

Keep in mind that these alternatives may trade off performance, readability, or maintainability depending on the specific requirements of your project.

Related benchmarks:

String split using regex vs string v2 (version: 0)

Comparing performance of: Split by regex vs Split by string

Created: 4 years ago by: Guest

Jump to the latest result

Split by regex

Split by string

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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