Benchmark: Regex match vs While loop

Tests:

Regex match
const value = "xwdhxwihcdwdu32ihc3wdy23d20&^SWGSHshsqshqjks.HSIhww2hsi19su1hsj010sj10sudsj1s.HISH92i2sn102us1ja1" const re = new RegExp('.{1,20}', 'g'); const chunks = []; const values = value.match(re); const key = "hello-world"; values?.forEach((value, i) => { const name = `${key}.${i}`; chunks.push({ name, value }); });
While loop
const value = "xwdhxwihcdwdu32ihc3wdy23d20&^SWGSHshsqshqjks.HSIhww2hsi19su1hsj010sj10sudsj1s.HISH92i2sn102us1ja1" const chunks = []; const key = "hello-world"; let cookie = Array.from(value); while (cookie.length) { chunks.push({ name: `${key}.${chunks.length}`, value: cookie.splice(0, 20) }); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex match
While loop

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Definition**
The benchmark is defined in JSON format and consists of two test cases: "Regex match" and "While loop". There's no script preparation code or HTML preparation code provided, which means that the tests are written directly in JavaScript.

**Test Case 1: Regex Match**

In this test case, a regular expression (regex) is used to extract chunks from a long string. The regex pattern `.{1,20}` matches any character (.) between 1 and 20 times (g flag for global matching). The extracted values are then pushed into an array `chunks` with a name and value.

**Test Case 2: While Loop**

In this test case, the same long string is processed using a while loop. The loop iterates until the length of the `cookie` array is zero, and in each iteration, it pushes an object with a name and value into the `chunks` array. The `cookie` array is created by converting the original string to an array using `Array.from()`.

**Approaches Compared**

Two approaches are compared:

1. **Regex Match**: Uses a regular expression to extract chunks from the string.
2. **While Loop**: Uses a while loop to process the string and extract chunks.

**Pros and Cons of Each Approach**

**Regex Match:**

Pros:

* Can be faster for large strings with predictable patterns, as it leverages optimized regex engines.
* More concise code.

Cons:

* May have performance issues if the pattern is complex or if there are many matching characters.
* Less control over the extraction process compared to a while loop.

**While Loop:**

Pros:

* Provides more control over the extraction process and can be adjusted for optimal performance.
* Can handle unpredictable patterns or large strings with multiple types of data.

Cons:

* More verbose code compared to regex match.
* May have slower performance due to JavaScript's interpretation nature.

**Other Considerations**

* **JavaScript Engine**: The benchmark results are reported in Safari 16, which uses the SpiderMonkey engine. Other JavaScript engines like V8 (Chrome) or Edge might produce different results.
* **String Data Type**: In Node.js, strings are implemented as UTF-16 encoded arrays of characters. This data type may affect performance.
* **Execution Per Second**: The benchmark measures executions per second, which indicates how many times the code is executed within a second.

**Library Usage**

There's no library usage mentioned in either test case. However, if you're using libraries like `regex-escape` or `string-length`, they might affect performance.

**Special JS Features/Syntax**

No special JavaScript features or syntax are used in this benchmark. The tests are written in standard JavaScript.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Safari/605.1.15

Browser/OS: Safari 16 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Regex match	2662957.8 Ops/sec
While loop	650905.8 Ops/sec

Related benchmarks:

Regex match vs While loop (version: 0)

Comparing performance of: Regex match vs While loop

Created: one year ago by: Guest

Jump to the latest result

Regex match

While loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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