Benchmark: Split vs regexp - MeasureThat.net

Script Preparation code:

var str = 'xoxoxooxoxoxooxoxooxxoxoxoxooxoxoxoxoxoxoxoxoxooxooxoxooxoxo';

Tests:

split
str.split('x');
regexp
str.match(/x/g)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
regexp

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its test cases.

**Benchmark Definition**

The benchmark measures the performance of two approaches: string splitting using `split()` (the traditional method) versus regular expressions (`regexp`).

**Script Preparation Code**

The script preparation code defines a sample string `str` containing 31 occurrences of the character 'x'. This string is used as input for both test cases.

**Html Preparation Code**

There is no HTML preparation code provided, so we can assume that this benchmark only tests JavaScript performance in isolation.

**Options Compared**

Two options are compared:

1. **String Splitting (`split()`)**: This method splits the input string into an array of substrings using a specified separator ('x' in this case). It's a traditional and widely supported approach.
2. **Regular Expressions (`regexp`)**: This method uses a regular expression to match all occurrences of 'x' in the input string. Regular expressions are powerful but can be slower than traditional methods.

**Pros and Cons**

Here's a brief summary of each approach:

* **String Splitting (`split()`)**:
	+ Pros:
		- Fast and efficient.
		- Widely supported by browsers and JavaScript engines.
	+ Cons:
		- Limited to splitting strings based on a single separator.
		- Can be slow for large input sizes if the separator is not present frequently.
* **Regular Expressions (`regexp`)**:
	+ Pros:
		- Flexible and powerful for pattern matching.
		- Can handle complex patterns, including quantifiers and alternatives.
	+ Cons:
		- Generally slower than traditional methods due to the overhead of compiling regular expressions.
		- May be slower on older browsers or with low-end hardware.

**Library**

There is no library explicitly mentioned in the benchmark definition. However, the `RegExp` object is used to create a regular expression pattern, which suggests that JavaScript's built-in regular expression functionality is being tested.

**Special JS Feature/Syntax**

The benchmark uses the `split()` and `match()` methods, which are standard JavaScript functions. No special features or syntax are required for these test cases.

**Other Alternatives**

For string splitting, some alternative approaches could include:

* Using a library like `lodash` with its `str.split()` function.
* Implementing a custom split algorithm using bitwise operations or other techniques.

For regular expressions, alternative approaches could include:

* Using a library like `regex-escape` to escape special characters in the input string.
* Using a more efficient regular expression engine, such as those available in some Node.js implementations.

However, these alternatives are not mentioned in the benchmark definition, and the standard JavaScript methods are likely being tested for their performance characteristics.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0

Browser/OS: Firefox 94 on Windows

View result in a separate tab

Test name	Executions per second
split	2750157.5 Ops/sec
regexp	664383.6 Ops/sec

Related benchmarks:

Split vs regexp (version: 0)

Comparing performance of: split vs regexp

Created: 3 years ago by: Guest

Jump to the latest result

split

regexp

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):