Benchmark: Regex vs For loop [1-9]|X 2

Script Preparation code:

var dataPool = ["1234", "1X34", "0123", "12x4"];
var testStr = dataPool[Math.floor(Math.random() * dataPool.length)];

Tests:

Regex
let isValid = true; let regStr = `(${i+1}|X)`; const regEx = new RegExp(regStr); for (let i = 0; i < testStr.length; i++) { let code = testStr.charAt(i); if(regEx.test(code) === false){ isValid = false; break; } } return isValid;
For loop, ParseInt
let isValid = true; for (let i = 0; i < testStr.length; i++) { let code = testStr.charAt(i); if (code === "X"){ } else{ let codeValue = parseInt(code, 10); if(codeValue !== i+1){ isValid = false; break; } } } return isValid;
For loop with switch case
let isValid = true; for (let i = 0; i < testStr.length; i++) { let char = testStr.charAt(i); switch (true) { case char === 'X': break; case parseInt(char, 10) === i + 1: break; default: isValid = false; } } return isValid;
For loop, toString
let isValid = true; for (let i = 0; i < testStr.length; i++) { let code = testStr.charAt(i); if (code === "X"){ } else{ if(code !== (i+1).toString()){ isValid = false; break; } } } return isValid;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
For loop, ParseInt
For loop with switch case
For loop, toString

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this specific benchmark.

**Benchmark Overview**

The provided JSON represents a benchmark that compares four different approaches to validate whether a character in a given string matches a specific pattern or value:

1. Regex (Regular Expression)
2. For loop with parsing `parseInt`
3. For loop with a switch case statement
4. For loop with string comparison using the `toString` method

**Options Compared**

The benchmark compares the execution time of each approach for a set of test cases, which include strings with characters that match or don't match the expected pattern.

Here's a brief description of each option:

1. **Regex**: This approach uses regular expressions to match the character in the string against a specific pattern (`(i+1)|X`). Regular expressions are powerful patterns used for matching character patterns in strings.
2. **For loop with parsing `parseInt`**: In this approach, the loop iterates through each character in the string and attempts to parse it as an integer using `parseInt`. If the parsed value matches the expected value (`i+1`), the validation passes; otherwise, it fails.
3. **For loop with switch case statement**: This approach uses a switch case statement to match the character against specific values (`'X'`, `(i+1)`). The switch case statement is evaluated for each character in the string, and if it matches one of the expected values, the validation passes; otherwise, it fails.
4. **For loop with string comparison using `toString`**: In this approach, the loop compares each character in the string to its corresponding value using the `toString()` method. If the characters match, the validation passes; otherwise, it fails.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **Regex**:
	* Pros: Regular expressions are powerful and flexible patterns for matching character sequences.
	* Cons: Regular expressions can be computationally expensive to evaluate, especially for complex patterns.
2. **For loop with parsing `parseInt`**:
	* Pros: This approach is straightforward and easy to implement for simple cases.
	* Cons: Parsing integers can introduce overhead due to string-to-number conversions.
3. **For loop with switch case statement**:
	* Pros: Switch case statements are efficient and easy to read for simple cases.
	* Cons: The number of cases must be carefully planned, and the syntax can become cumbersome for complex patterns.
4. **For loop with string comparison using `toString`**:
	* Pros: This approach is simple and intuitive for comparing characters directly.
	* Cons: It may not perform well for large character sets or complex comparisons.

**Library Used**

In this benchmark, none of the libraries are explicitly mentioned. However, it's worth noting that regular expressions rely on the JavaScript built-in `RegExp` constructor to create patterns.

**Special JS Features or Syntax**

The benchmark does not explicitly use any special JavaScript features or syntax beyond the standard language features. However, it does use some implicit assumptions about the behavior of primitive types (e.g., numbers are integers) and character comparison operations (`===`, `!==`).

**Alternatives**

If you're interested in exploring alternative approaches for validation, consider:

1. **String manipulation using JavaScript methods**: Instead of regular expressions or switch case statements, you can use built-in JavaScript methods like `indexOf()`, `lastIndexOf()`, `substring()`, etc.
2. **Other validation libraries or frameworks**: Depending on your specific requirements, you may want to explore other libraries or frameworks for validation, such as Lodash or Validate.js.
3. **Alternative data structures**: Consider using data structures like arrays, objects, or sets instead of strings for validation purposes.

Keep in mind that the choice of approach depends on your specific use case, performance requirements, and personal preferences.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Regex	3944572.0 Ops/sec
For loop, ParseInt	1445041.2 Ops/sec
For loop with switch case	1440011.9 Ops/sec
For loop, toString	2588539.2 Ops/sec

Related benchmarks:

Regex vs For loop [1-9]|X 2 (version: 0)

Comparing performance of: Regex vs For loop, ParseInt vs For loop with switch case vs For loop, toString

Created: 2 years ago by: Guest

Jump to the latest result

Regex

For loop, ParseInt

For loop with switch case

For loop, toString

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):