Benchmark: Regex vs split/join checking

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

Latest run results:

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

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Let's break down the provided benchmark definition and test cases.

**Overview**

The benchmark compares two approaches to check if a string is within a specific range: using a regular expression (`Regex`) and using the `split` and `join` methods.

**Options Compared**

There are two options being compared:

1. **Regex**: Uses a regular expression pattern (`^([0-9]{1,20})$`) to match strings that start with exactly 1 to 20 digits.
2. **Split and Join**: Uses the `split` method to split the string into an array of characters and then checks if all characters are non-Numeric (using `!isNaN(x)`).

**Pros and Cons**

**Regex:**

Pros:

* Can be easily adapted to check for specific patterns, not just numeric ranges.
* Often faster than string manipulation methods.

Cons:

* Can be slower for large strings due to the overhead of regular expression parsing.
* May have performance issues if the pattern is complex or contains many groups.

**Split and Join:**

Pros:

* Generally faster than using regular expressions for simple string checks.
* Does not require additional dependencies (unlike regular expressions).

Cons:

* Requires creating an array of characters, which can be slower for very large strings.
* May not be as concise or readable as a regular expression pattern.

**Other Considerations**

In this benchmark, the `split` and `join` method is used to check if all characters in the string are non-Numeric. This approach assumes that the input string only contains digits, which may not always be the case.

**Library Usage**

The `split` method uses the built-in JavaScript `Array.prototype.split()` method, which is a standard library function.

**Special JS Feature or Syntax**

This benchmark does not use any special JavaScript features or syntax. It's a straightforward implementation of basic string manipulation methods.

**Benchmark Preparation Code and Test Cases**

The script preparation code creates a string variable `str` with a fixed value ('1873189741874817'). The HTML preparation code is empty, which means this benchmark only runs on the client-side (in JavaScript) without any external dependencies.

The two test cases are:

1. **Regex**: Uses a regular expression pattern to check if the input string starts and ends with exactly 1 to 20 digits.
2. **Split and Join**: Checks if all characters in the input string are non-Numeric by splitting the string into an array of characters and then verifying each character.

**Alternatives**

Other approaches to check if a string is within a specific range include:

* Using the `parseInt()` function to attempt to parse the string as an integer, checking for errors or successful parsing.
* Using the `isFinite()` function to check if the input string represents a finite number.
* Implementing a custom string manipulation algorithm using bitwise operations and mathematical calculations.

Keep in mind that these alternatives may have different trade-offs in terms of performance, readability, and maintainability compared to the regular expression approach or the split/join method.

Related benchmarks:

Regex vs split/join checking (version: 0)

Comparing performance of: Regex vs Split and Join

Created: 4 years ago by: Registered User

Jump to the latest result

Regex

Split and Join

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):