Benchmark: Regex vs split/join checking alphanumeric big number

Script Preparation code:

var str = '1873189741874817';

Tests:

Regex
/^[0-9]{1,20}$/.test(str);
Split and Join
str.length < 20 && str.split('').every(x => !isNaN(x));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Split and Join

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 JSON data to understand what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that contains two test cases:

1. `"Regex"`: This test case uses a regular expression (`/^[0-9]{1,20}$/`) to check if the input string `str` is alphanumeric and has no more than 20 digits.
2. `"Split and Join"`: This test case uses JavaScript's built-in string methods `split()` and `every()`, along with the `isNaN()` function, to check if all characters in the input string are numeric and have a length less than 20.

**Options Compared**

The two options being compared are:

* **Regex**: Uses a regular expression to match the input string.
* **Split and Join**: Uses JavaScript's built-in string methods `split()`, `every()`, and `isNaN()` to check the input string.

**Pros and Cons of Each Approach**

**Regex:**

Pros:

* Can be more efficient for simple pattern matching.
* Allows for more flexibility in terms of patterns and validation rules.

Cons:

* Can be slower for complex patterns or large input strings.
* May require more time to write and optimize the regex pattern.

**Split and Join:**

Pros:

* Typically faster than using regular expressions, especially for small input strings.
* More intuitive and easier to understand for developers familiar with JavaScript's string methods.

Cons:

* May not be as flexible in terms of validation rules or patterns.
* Requires more code to implement the test logic.

**Other Considerations**

* The use of `isNaN()` is a common pattern in JavaScript, but it may not work correctly for all types of numeric values (e.g., NaN, Infinity).
* The benchmarking results indicate that the "Regex" option performs better than the "Split and Join" option on this particular test case.

**Library Usage**

None of the provided test cases use any external libraries. They rely solely on JavaScript's built-in methods and syntax.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in these test cases. The regular expression pattern is a standard feature, and the `split()`, `every()`, and `isNaN()` functions are all part of the JavaScript language.

**Alternatives**

If you were to modify this benchmark or create new ones, some alternative options could be:

* Using other regular expression patterns (e.g., `\d+` instead of `/^[0-9]{1,20}$/`)
* Implementing a custom algorithm for string validation
* Using a different set of test cases or input strings to evaluate the performance of each option

Keep in mind that the best approach will depend on the specific requirements and constraints of your project.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; RMX1911) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.85 Mobile Safari/537.36

Browser/OS: Chrome Mobile 94 on Android

View result in a separate tab

Test name	Executions per second
Regex	1992390.5 Ops/sec
Split and Join	111243.1 Ops/sec

Related benchmarks:

Regex vs split/join checking alphanumeric big number (version: 0)

Comparing performance of: Regex vs Split and Join

Created: 2 years ago by: Guest

Jump to the latest result

Regex

Split and Join

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):