Benchmark: r1 v r2 - MeasureThat.net

Script Preparation code:

var str = '124961925861925691256981625';
var r1 = /\D/g;
var r2 = /\D+/g;

Tests:

r1
str.replace(r1, '');
r2
str.replace(r2, '');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
r1
r2

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a simple JavaScript code that defines two regular expressions: `r1` and `r2`. The purpose of these regular expressions is to match any non-digit characters (`\\D`) in a string.

**Regular Expressions**

* `r1 = /\\D/g;`: This regular expression matches any sequence of non-digit characters (`\\D`) globally (`g`) in the input string.
* `r2 = /\\D+/g;`: This regular expression matches any sequence of one or more non-digit characters (`\\D+`) globally (`g`) in the input string.

**Options compared**

The benchmark is comparing the performance of two different approaches:

1. **`r1`**: Replaces all non-digit characters with an empty string, effectively removing them from the input string.
2. **`r2`**: Replaces one or more non-digit characters with an empty string, also removing them from the input string.

**Pros and Cons**

* Using `r1` (single character replacement):
	+ Pros: Generally faster and more efficient, as it only removes single characters.
	+ Cons: May not be suitable for cases where multiple consecutive non-digit characters need to be removed.
* Using `r2` (multiple character replacement):
	+ Pros: Suitable for cases where multiple consecutive non-digit characters need to be removed.
	+ Cons: Generally slower and less efficient, as it removes one or more characters at a time.

**Library**

The benchmark doesn't explicitly use any libraries. However, the regular expressions themselves are built into JavaScript's ECMAScript specification, which is implemented by most modern browsers.

**Special JS feature/Syntax**

There are no special JavaScript features or syntaxes used in this benchmark. The code is written in standard JavaScript and should be compatible with most modern browsers.

**Alternative approaches**

Other alternatives to these two approaches could include:

* Using a different regular expression pattern, such as `r = /\\D+|\\D/g;` which matches either one or more non-digit characters.
* Using a different approach altogether, such as using a string replacement library like `String.prototype.replace()` with an array of replacements.

**Benchmark Preparation Code**

The benchmark preparation code defines two variables: `str` and the regular expressions `r1` and `r2`. The variable `str` contains a sample string containing non-digit characters. The regular expression patterns are defined as strings, which can be executed using JavaScript's built-in RegExp constructor.

**Individual test cases**

Each individual test case represents a separate benchmark that tests the performance of either `r1` or `r2`. The `Benchmark Definition` property specifies the code to be tested, and the `Test Name` property provides a label for each test case.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser/OS: Chrome 53 on Mac OS X 10.12.0

View result in a separate tab

Test name	Executions per second
r1	2262306.8 Ops/sec
r2	2293358.0 Ops/sec

Related benchmarks:

r1 v r2 (version: 0)

Comparing performance of: r1 vs r2

Created: 8 years ago by: Guest

Jump to the latest result

r1

r2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):