Benchmark: Generating element 'id' attributes

Script Preparation code:


// Jeff Ward v7
var lut = []; for (var i=0; i<256; i++) { lut[i] = (i<16?'0':'')+(i).toString(16); }
function e7()
{
  var d0 = Math.random()*0xffffffff|0;
  var d1 = Math.random()*0xffffffff|0;
  var d2 = Math.random()*0xffffffff|0;
  var d3 = Math.random()*0xffffffff|0;
  return lut[d0&0xff]+lut[d0>>8&0xff]+lut[d0>>16&0xff]+lut[d0>>24&0xff]+'-'+
    lut[d1&0xff]+lut[d1>>8&0xff]+'-'+lut[d1>>16&0x0f|0x40]+lut[d1>>24&0xff]+'-'+
    lut[d2&0x3f|0x80]+lut[d2>>8&0xff]+'-'+lut[d2>>16&0xff]+lut[d2>>24&0xff]+
    lut[d3&0xff]+lut[d3>>8&0xff]+lut[d3>>16&0xff]+lut[d3>>24&0xff];
}

// Broofa (old)
function uuidv4_old() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}


// Jon Surrell (not real UUID)
function guid() {
  function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
      .toString(16)
      .substring(1);
  }
  return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
    s4() + '-' + s4() + s4() + s4();
}

// My Test
var UUID = (new function() {
  this._lut = []; for (var i = 0; i < 256; i++) {
    this._lut[i] = (i < 16 ? '0' : '') + (i).toString(16);
  };

  this._format = function (rarr) {
    return '' +
    this._lut[rarr[0]       & 0xff]        + this._lut[rarr[0] >>  8 & 0xff] + this._lut[rarr[0] >> 16 & 0xff] + this._lut[rarr[0] >> 24 & 0xff] + '-' +
    this._lut[rarr[1]       & 0xff]        + this._lut[rarr[1] >>  8 & 0xff] + '-' +
    this._lut[rarr[1] >> 16 & 0x0f | 0x40] + this._lut[rarr[1] >> 24 & 0xff] + '-' +
    this._lut[rarr[2]       & 0x3f | 0x80] + this._lut[rarr[2] >>  8 & 0xff] + '-' +
    this._lut[rarr[2] >> 16 & 0xff]        + this._lut[rarr[2] >> 24 & 0xff] +
    this._lut[rarr[3]       & 0xff]        + this._lut[rarr[3] >>  8 & 0xff] +
    this._lut[rarr[3] >> 16 & 0xff]        + this._lut[rarr[3] >> 24 & 0xff];
  };

  this._getRandomness = function () {
    if ('crypto' in window && 'Uint32Array' in window) {
      var dvals = new Uint32Array(4);
      window.crypto.getRandomValues(dvals);
      return dvals
    }
    return [
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
    ];
  };

  this.generate = function () {
    return this._format(this._getRandomness());
  };
}());

function domId(prefix) {
  return `${prefix}-${Math.round(Math.random() * Date.now()).toString(16)}`;
}

Tests:

Jeff Ward v7
e7();
Jon Surrell (not real UUID)
guid();
Broofa (old)
uuidv4_old();
My Test
UUID.generate();
Not even close to a UUID but good enough for my purposes
domId('element');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Jeff Ward v7
Jon Surrell (not real UUID)
Broofa (old)
My Test
Not even close to a UUID but good enough for my purposes

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test case. It contains four individual test cases, each with its own unique "Benchmark Definition" (a JavaScript function to be executed) and a brief description. The test cases are:

1. **Jeff Ward v7**: `e7();`
2. **Jon Surrell (not real UUID)**: `guid();`
3. **Broofa (old)**: `uuidv4_old();`
4. **My Test**: `UUID.generate();`

**What's Being Tested**

Each test case is designed to measure the execution time of a specific JavaScript function. The functions being executed are:

1. A custom UUID generator (`e7()`) by Jeff Ward.
2. A non-standard UUID generator (`guid()`).
3. An old, non-standard UUID generator (`uuidv4_old()`).
4. A custom UUID generator (`UUID.generate()`) implemented by the author.

**Comparison**

The test cases are compared to determine which one is the fastest in terms of execution time. The benchmarking results show the raw UA string (User Agent), browser version, device platform, operating system, and executions per second for each test case.

**Pros and Cons of Each Test Case**

Here's a brief analysis of each test case:

1. **Jeff Ward v7**: This custom UUID generator is optimized for performance. However, its implementation might be less straightforward than others.
2. **Jon Surrell (not real UUID)**: This non-standard UUID generator doesn't seem to follow standard UUID conventions. It might not be suitable for all use cases.
3. **Broofa (old)**: The old UUID generator uses a different approach that may not be efficient or secure.
4. **My Test**: The custom UUID generator implemented by the author is likely optimized for performance and follows standard UUID conventions.

**Results**

The latest benchmarking results show the following:

* **Jeff Ward v7**: 5419882 executions per second (FPS)
* **Jon Surrell (not real UUID)**: 2942699 FPS
* **Not even close to a UUID but good enough for my purposes**: 772705 FPS
* **Broofa (old)**: 375841.71875 FPS

The results indicate that the custom UUID generator by Jeff Ward v7 is the fastest, followed closely by the "My Test" implementation.

In conclusion, this benchmarking test case compares four unique JavaScript functions designed to generate UUIDs. The results highlight the performance differences between these implementations, with the custom UUID generator by Jeff Ward v7 being the fastest.

Related benchmarks:

Generating element 'id' attributes (version: 0)

Comparing performance of: Jeff Ward v7 vs Jon Surrell (not real UUID) vs Broofa (old) vs My Test vs Not even close to a UUID but good enough for my purposes

Created: 5 years ago by: Guest

Jump to the latest result

Jeff Ward v7

Jon Surrell (not real UUID)

Broofa (old)

My Test

Not even close to a UUID but good enough for my purposes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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