Benchmark: Digit extraction

Script Preparation code:

function makeid() {
   var result           = '';
   var characters       = 'abcdefghijklmnopqrstuvwxyz0123456789';
   var charactersLength = characters.length;
   for ( var i = 0; i < 30; i++ ) {
      result += characters.charAt(Math.floor(Math.random() * charactersLength));
   }
   return result;
}

var result = '';

Tests:

Match
const digits = makeid().match(/\d+/g); result += digits != null ? digits.join('') : '';
Replace
result += makeid().replace(/\D/g,'');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Match
Replace

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what is tested in each benchmark.

**Benchmark Definition**
The benchmark definition is a JSON object that contains metadata about the test case, such as its name and description. In this case, there are two test cases: "Match" and "Replace". The script preparation code for each test case uses a function called `makeid()` to generate a random 30-character string.

**Options compared**
In the "Match" benchmark, the options being compared are regular expressions that match digits (`\\d+`) versus no match (no regular expression). In the "Replace" benchmark, the option being compared is replacing non-digits (`\\D`) with an empty string.

**Pros and Cons of different approaches**

* **Regular Expressions**: Regular expressions provide a powerful way to match patterns in strings. However, they can be slow and may require more memory than other methods.
* **No regular expression**: Using no regular expression means that the test case will simply append the generated string to the result variable. This approach is likely faster but less efficient.

**Library usage**
There is no explicit library mentioned in the benchmark definition, except for JavaScript's built-in `Math` and `String` methods. However, the use of regular expressions suggests that JavaScript's RegExp API is being used under the hood.

**Special JS feature or syntax**
The benchmark makes use of the `join()` method on an array of strings, which is a modern JavaScript feature introduced in ECMAScript 5 (ES5). This method is not supported in older versions of JavaScript and may require transpilation for compatibility with older browsers.

**Other alternatives**

* **Non-regular expression approach**: Another alternative to regular expressions could be using string manipulation methods like `indexOf()` and `substring()`. However, this approach would likely be slower than using regular expressions.
* **Regular expression engine**: Some platforms provide a dedicated regular expression engine that can improve performance. For example, Firefox has a built-in regular expression engine that is optimized for speed.

**Benchmark preparation code**
The script preparation code is generated to create an array of random digits by calling the `makeid()` function 30 times and then concatenating them using the `join()` method. This code creates a simple but effective way to generate test data for the benchmark.

Overall, the benchmark compares two different approaches to extracting digits from a string: regular expressions versus no regular expression. The results indicate that the "Match" benchmark performs better than the "Replace" benchmark.

Related benchmarks:

Digit extraction (version: 0)

Comparing performance of: Match vs Replace

Created: 6 years ago by: Guest

Jump to the latest result

Match

Replace

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):