Benchmark: A Spl vs Regx - MeasureThat.net

Script Preparation code:

const urlPath = "/aaa/bbbb/ccccc/dddddd/eeeeeee"

function regspl() {
  if (urlPath === "/") {
    return [""];
  } else {
    const regex = /[^\/]+/g;
    return urlPath.match(regex) || [""];
  }
}

function nmsplit() {
 	return urlPath.split('/').filter(Boolean);
}

Tests:

Split
nmsplit()
Regex
regspl()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Regex

8.1M/s

Split

7.9M/s

View exact numbers

Test name	Executions per second
✓ Regex	8,127,405 Ops/sec
Split	7,941,237 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.

**Benchmark Overview**

The benchmark compares two approaches to split a URL path into an array of segments: Regular Expression (Regx) and Non-RegEx (Nmsplit).

**Script Preparation Code**

The script preparation code defines two functions:

1. `regspl()`: This function uses a regular expression to split the URL path into an array of segments. The regular expression `/[^\\/]+/g` matches one or more characters that are not forward slashes (`/`). The `g` flag at the end makes the regex match all occurrences in the string, not just the first one.
2. `nmsplit()`: This function uses the built-in `split()` method to split the URL path into an array of segments. It then filters out any empty strings from the resulting array using the `filter(Boolean)` method.

**Library and Special JS Feature**

There is no explicit library mentioned in the script preparation code. However, it's worth noting that the regular expression `/[^\\/]+/g` uses a special regex feature called "global" (`g`) flag, which makes the regex match all occurrences in the string.

**Pros and Cons of Each Approach**

1. **Regx (Regular Expression)**:
	* Pros:
		+ Can be faster for certain types of input data.
		+ Allows for more complex splitting logic using regular expressions.
	* Cons:
		+ Can be slower than non-regex approaches for very large input data.
		+ May be less intuitive to read and maintain for developers without regex experience.
2. **Nmsplit (Non-RegEx)**:
	* Pros:
		+ Typically faster and more memory-efficient than regex-based approaches.
		+ Easier to understand and maintain for developers without regex experience.
	* Cons:
		+ May not work correctly for certain types of input data that don't match the expected pattern.

**Other Considerations**

When choosing between these two approaches, consider the following:

* What is the typical size and complexity of the URL paths you'll be working with?
* Do you need to support edge cases or special characters in the URL path?
* How important is code readability and maintainability to your team?

**Alternatives**

If you don't have access to the `split()` method, alternative approaches could include:

1. Using a custom loop to iterate over each character of the input string and build an array of segments.
2. Using a different regex flavor that's optimized for speed or memory usage.

However, without more information about the specific requirements and constraints of your project, it's difficult to recommend an alternative approach.

A Spl vs Regx (version: 0)

Comparing performance of: `Split vs Regex`

Created: 2 years ago by: Guest

Go to the latest result

Split

Regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

A Spl vs Regx (version: 0)

Comparing performance of: Split vs Regex

Created: 2 years ago by: Guest

Go to the latest result

Split

Regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `Split vs Regex`