Benchmark: String split using regex vs string

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(/\s+/g)
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: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Split by regex	1701091.9 Ops/sec
Split by string	2229546.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is testing two approaches to splitting a string: using regular expressions (regex) and using the `split` method with a space character (`' '`) as the separator.

**Options Compared**

* **Regex**: The first option uses regex to split the string. The `/\\s+/g` pattern matches one or more whitespace characters (`\\s+`) globally (`g`) across the entire string.
* **String Split Method**: The second option uses the `split` method with a space character as the separator.

**Pros and Cons**

* **Regex Approach**:
	+ Pros: Can handle complex splitting scenarios, flexible pattern syntax, and can be used to extract specific substrings.
	+ Cons: Can be slower than the string split method due to the overhead of parsing and executing regex patterns. Requires knowledge of regex syntax.
* **String Split Method**:
	+ Pros: Fast, lightweight, and easy to understand.
	+ Cons: Limited flexibility, may not work as expected with edge cases or non-standard whitespace characters.

**Library/Additional Considerations**

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that the regex approach uses a built-in JavaScript feature (regex patterns) to split the string.

**Special JS Feature/Syntax**

The benchmark defines two test cases using special syntax:

* `\\s+` in the regex pattern: This is a regex escape sequence for whitespace characters.
* `\r\n`: This is a newline character. In this context, it's used as a separator in the string split method.

**Other Alternatives**

If you wanted to test alternative approaches, some options could be:

* Using `replace()` with a callback function to split the string
* Using a library like Lodash or underscore.js for string manipulation
* Testing different string separators (e.g., tabs (`\t`), commas (`,`), etc.)
* Adding more complex scenarios to handle edge cases (e.g., strings with newline characters, null/undefined values, etc.)

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

Related benchmarks:

String split using regex vs string (version: 0)

Comparing performance of: Split by regex vs Split by string

Created: 6 years ago by: Guest

Jump to the latest result

Split by regex

Split by string

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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