Benchmark: Regex v split/filter/join

Script Preparation code:

var str = '/api/US//foo///bar/test';

Tests:

regex
str.replace(/\/\/+/g, '/');
slpit
str.split('/').filter(_ => _).join('/');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
slpit

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 15 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Safari/605.1.15

Browser/OS: Safari 26 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
regex	934658752.0 Ops/sec
slpit	8546756.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net!

**Benchmark Definition**

The benchmark definition provided is a JSON object that outlines the experiment to be performed. Here's what's tested:

* The script preparation code `var str = '/api/US//foo///bar/test';` defines the input string `str`.
* Two benchmark definitions are specified:
	1. `str.replace(/\\/\\/+/g, '/');`: This tests the performance of the `replace()` method with a regular expression that replaces all occurrences of four consecutive forward slashes (`'\\''`) with a single forward slash (`'/"`).
	2. `str.split('/').filter(_ => _.includes('/')).join('/');`: This tests the performance of the `split()`, `filter()`, and `join()` methods in sequence.

**Options Compared**

The two benchmark definitions compare different approaches to achieve the same goal:

* **Regex (replace())**: Uses a regular expression to replace all occurrences of four consecutive forward slashes with a single forward slash.
* **String manipulation (split(), filter(), join())**: Splits the string into an array using `/` as the separator, filters out elements that do not contain `/`, and then joins the remaining elements back into a string.

**Pros and Cons**

Here's a brief analysis of each approach:

### Regex (replace())

Pros:

* **Efficient replacement**: The regular expression can replace all occurrences in a single operation.
* **Flexible**: Can be used to perform complex text replacements.

Cons:

* **Overhead**: Regular expressions can introduce additional overhead due to parsing and compilation.
* **Slower for large inputs**: May be slower than string manipulation methods for very long input strings.

### String Manipulation (split(), filter(), join())

Pros:

* **Simple and efficient**: Each method performs a single, well-known operation.
* **Faster for large inputs**: Typically faster than regex for very long input strings.

Cons:

* **More steps**: Requires multiple operations to achieve the same result.
* **Less flexible**: Limited to performing simple string manipulation.

**Library and Special Features**

The benchmark does not use any libraries or special JavaScript features. It's a straightforward test of two different approaches to achieving the same goal.

**Other Alternatives**

If you'd like to explore alternative approaches, consider:

* Using `String.prototype.replaceAll()` (a newer method that combines replace() with a callback function)
* Employing other string manipulation techniques, such as using `String.prototype.split()` with a custom separator or using `Array.prototype.filter()` and `Array.prototype.join()` separately
* Optimizing the regex pattern for better performance

Keep in mind that these alternatives might not be relevant to this specific benchmark definition.

Related benchmarks:

Regex v split/filter/join (version: 0)

Comparing performance of: regex vs slpit

Created: 4 years ago by: Guest

Jump to the latest result

regex

slpit

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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