Benchmark: matthex - MeasureThat.net

Script Preparation code:

var IDX=36, HEX='';
while (IDX--) HEX += IDX.toString(36);

function uid(len) {
  var str='', num = len || 6;
  while (num--) str += HEX[Math.random() * 36 | 0];
  return str;
}

function uid2(len = 6) {
  const  hex = '0123456789abcdefghijklmnopqrstuvwxyz';
  let id = '';
  while(len--) id += hex[Math.random() * 36 | 0];
  return id;
}

function hex() {
  return Math.random().toString(36).substring(6);
}

Tests:

uid
uid()
uid2
uid2()
hex
hex()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
uid
uid2
hex

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 dive into the explanation of the provided benchmark.

**What is tested on the provided JSON?**

The provided JSON represents three individual test cases: `uid()`, `uid2()`, and `hex()` in JavaScript microbenchmarks hosted on MeasureThat.net. These test cases aim to measure the execution performance of these functions on different browsers and platforms.

**Options compared:**

1.  **`uid()`**: This function generates a unique identifier using base-36 conversion.
    *   Pros: Fast, simple implementation.
    *   Cons: Not suitable for very large identifiers due to the limited character set (0-35).
2.  **`uid2()`**: Similar to `uid()`, but uses a predefined string of hexadecimal digits (`0123456789abcdefghijklmnopqrstuvwxyz`) instead of base-36 conversion.
    *   Pros: Larger character set, making it more suitable for very large identifiers.
    *   Cons: Slightly slower than `uid()` due to the lookup in the predefined string.
3.  **`hex()`**: This function generates a random hexadecimal string using `Math.random().toString(36).substring(6)`.
    *   Pros: Fast and easy to implement, with a large character set.
    *   Cons: May not be suitable for generating deterministic identifiers.

**Library used:**

None of the functions use any external libraries. They are pure JavaScript implementations.

**Special JS feature or syntax:**

The `Math.random()` function is used in all three functions, which is a built-in JavaScript function that returns a random number between 0 (inclusive) and 1 (exclusive).

**Benchmark preparation code:**

The benchmark preparation code generates a script with a variable `IDX` initialized to 36 and an empty string `HEX` for base-36 conversion. The functions `uid()`, `uid2()`, and `hex()` are defined as shown in the JSON.

**Individual test cases:**

Each test case is represented by one of the three functions (`uid()`, `uid2()`, or `hex()`). The test name and benchmark definition are specified for each function.

**Latest benchmark result:**

The provided latest benchmark result shows the execution performance (in executions per second) of each function on a Safari 14 browser, running on a Mac OS X 10.15.6 system:

*   `uid()`: 1996601.25 executions per second
*   `uid2()`: 1255932.25 executions per second
*   `hex()`: 842986.3125 executions per second

**Other alternatives:**

If the provided functions are not suitable for your use case, you may consider alternative approaches:

*   **Cryptographically secure pseudo-random number generators (CSPRNGs)**: If generating unique identifiers is crucial, consider using a CSPRNG like `crypto.getRandomValues()` in Node.js or the `window.crypto.getRandomValues()` API in browsers.
*   **UUID generation libraries**: There are libraries available that can generate UUIDs efficiently and securely, such as `uuid` in JavaScript.

In summary, the benchmark compares the performance of three functions for generating unique identifiers: `uid()`, `uid2()`, and `hex()`. The choice of function depends on the specific requirements of your use case, including the need for speed, security, or determinism.

Related benchmarks:

matthex (version: 0)

Comparing performance of: uid vs uid2 vs hex

Created: 5 years ago by: Guest

Jump to the latest result

uid

uid2

hex

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):