Benchmark: create_UUID. - MeasureThat.net

Script Preparation code:

function create_UUID1(a){return a?(a^Math.random()*16>>a/4).toString(16):([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g,create_UUID1)}
function create_UUID2() {
  var dt = new Date().getTime();
  var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    var r = (dt + Math.random() * 16) % 16 | 0;
    dt = Math.floor(dt / 16);
    return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
  });
  return uuid;
}

Tests:

create_UUID1
create_UUID1()
create_UUID2
create_UUID2()
create_UUID3
(function(a,b){for(b=a='';a++<36;b+=a*51&52?(a^15?8^Math.random()*(a^20?16:4):4).toString(16):'-');return b})()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
create_UUID1
create_UUID2
create_UUID3

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and its options, discussing the pros and cons of each approach.

**Benchmark Overview**

The test cases measure the performance of different UUID (Universally Unique Identifier) generation functions in JavaScript. A UUID is a 128-bit number used to identify information in computer systems.

**Options Compared**

Three UUID generation functions are compared:

1. `create_UUID1` (aka V4 UUID, defined by RFC 4122):
	* Purpose: Generate a random UUID.
	* Formula: `(a^Math.random()*16>>a/4).toString(16)`
	* Pros:
		+ Fast and efficient.
		+ Suitable for generating unique identifiers in many applications.
	* Cons:
		+ May produce duplicate IDs if used in a limited range of values.
2. `create_UUID2` (aka UUID.js, also defined by RFC 4122):
	* Purpose: Generate a random UUID with some pseudo-randomness to ensure uniqueness.
	* Formula: `var dt = new Date().getTime(); var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {...})`
	* Pros:
		+ More efficient than `create_UUID1` due to reduced overhead from the Date object.
		+ Suitable for generating unique identifiers in many applications.
	* Cons:
		+ May not be suitable for cryptographic purposes due to the pseudo-randomness used.
3. Custom UUID generation function (aka `(function(a,b){...})()`):
	* Purpose: Generate a custom, non-standard UUID format.
	* Formula: `(function(a,b){for(b=a='';a++<36;b+=a*51&52?(a^15?8^Math.random()*(a^20?16:4):4).toString(16):'-');return b})()`
	* Pros:
		+ Provides more control over the generated UUID format.
	* Cons:
		+ May be slower due to the custom implementation.

**Library and Purpose**

`create_UUID2` uses the `Date` object, which is a built-in JavaScript library. The purpose of using this library is to introduce some pseudo-randomness in the UUID generation process.

**Special JS Feature/Syntax**

None of the provided code snippets use any special JavaScript features or syntax beyond what's commonly used in modern JavaScript development. However, it's worth noting that the custom UUID generation function uses a recursive function call (`(function(a,b){...})()`), which is not typically used in standard JavaScript programming.

**Other Alternatives**

If you wanted to generate a UUID using other methods, some alternatives include:

1. Using a cryptographically secure pseudo-random number generator (CSPRNG) like Web Cryptography API.
2. Generating a UUID based on the user's system time and hardware information.
3. Using a third-party library that provides UUID generation functionality.

Keep in mind that each of these alternatives may have their own trade-offs in terms of performance, security, or control over the generated UUID format.

**Benchmark Result**

The benchmark result shows the execution speed per second for each test case on a specific browser and device platform. The results suggest that `create_UUID2` is slightly faster than `create_UUID1`, while the custom UUID generation function is slower.

Related benchmarks:

create_UUID. (version: 0)

Comparing performance of: create_UUID1 vs create_UUID2 vs create_UUID3

Created: 7 years ago by: Guest

Jump to the latest result

create_UUID1

create_UUID2

create_UUID3

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):