Benchmark: uuid generation crypto.getRandomValues

Tests:

uuidv4
bits = crypto.getRandomValues(new Uint8Array(20)) bits[5] = (bits[5] & 0x4F) | 0x40; bits[8] = (bits[8] & 0xBF) | 0x80; bits = [...bits].map(e => e.toString(16).padStart(2,'0') ).reduce((a,c,i)=>a+([4,7,10,13].includes(i)?'-':c));
random 1
Array(20).fill(0).map(()=>crypto.getRandomValues(new Uint8Array(1))[0].toString(16).padStart(2,'0')).reduce((a,c,i)=>a+([4,7,10,13].includes(i)?'-':c))
random 2
([1e3]+-10+-10+-1e5).replace(/\d/g, () => crypto.getRandomValues(new Uint8Array(1))[0].toString(16).padStart(2,'0'))
random 3
let s=[]; crypto.getRandomValues(new Uint8Array(20)).map( e => s.push(e.toString(16).padStart(2,'0')) ); [4,7,10,13].map( idx => s[idx]='-' ); s.join('');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
uuidv4
random 1
random 2
random 3

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking JSON and explain what's being tested.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The goal of this benchmark is to measure the performance of different approaches for generating UUIDs (Universally Unique Identifiers) using the `crypto` module in JavaScript.

**UUID Generation Methods**

The benchmark tests four different methods for generating UUIDs:

1. **uuidv4**: This method uses the `crypto.getRandomValues` function to generate 20 random bytes, then modifies them according to a specific pattern. The resulting UUID is generated by reducing the modified bytes into a string.
2. **random 1**: This method generates an array of 20 random values using `crypto.getRandomValues`, converts each value to a hexadecimal string, and then reduces these strings together with some modifications.
3. **random 2**: Similar to `random 1`, but uses a different pattern for modifying the generated values.
4. **random 3**: This method creates an empty array `s` and pushes the generated random bytes into it as hexadecimal strings, followed by replacing specific indices with hyphens.

**Library and Syntax**

In this benchmark, the `crypto` module is used extensively. The `getRandomValues` function is a part of this module, which returns an array of random numbers.

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Comparison of Approaches**

The pros and cons of each approach are:

* **uuidv4**: This method uses the least amount of modifications to generate the UUID, making it potentially the fastest. However, it may be less readable due to the complex pattern used.
* **random 1** and **random 2**: These methods use more modifications than `uuidv4`, but they also provide more opportunities for optimization (e.g., caching or memoization). However, their increased complexity may lead to slower execution times.
* **random 3**: This method is the slowest due to the unnecessary array creation and string manipulation.

**Other Alternatives**

If you're looking for alternative methods to generate UUIDs in JavaScript, consider using a dedicated library like `uuid` or `nanoid`. These libraries provide a simple and efficient way to generate UUIDs without relying on the `crypto` module.

In conclusion, this benchmark tests four different approaches for generating UUIDs using the `crypto` module. The choice of approach depends on trade-offs between performance, readability, and complexity.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
uuidv4	226747.6 Ops/sec
random 1	36632.7 Ops/sec
random 2	49329.8 Ops/sec
random 3	324662.1 Ops/sec

Related benchmarks:

uuid generation crypto.getRandomValues (version: 0)

Comparing performance of: uuidv4 vs random 1 vs random 2 vs random 3

Created: 4 years ago by: Guest

Jump to the latest result

uuidv4

random 1

random 2

random 3

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):