Benchmark: RegEx vs For Loop

HTML Preparation code:

var string = "passw)odas4gsdfsdf";

Script Preparation code:

var string = "passw)odas4gsdfsdf";

Tests:

RegEx
let isPasswordValid = false; const number = new RegExp('(?=.*[0-9])'); isPasswordValid = number.test(string);
For Loop
let isPasswordValid = false; for (let i = 0; i < string.length; i++) { let code = string.charCodeAt(i); if (code >= 48 && code <= 57) { isPasswordValid = true; break; } }

Historical Performance Data aggregated from 166 community runs

Desktop Results:

Chrome 106 runs

RegEx

4.2M/s

For Loop

974K/s

Fastest: RegEx (4.3x faster)

View exact numbers

✓ RegEx: 4,153,540 ops/sec
• For Loop: 974,410 ops/sec

Firefox 35 runs

For Loop

40.0M/s

RegEx

9.0M/s

Fastest: For Loop (4.4x faster)

View exact numbers

✓ For Loop: 39,963,964 ops/sec
• RegEx: 8,986,021 ops/sec

Other 6 runs

RegEx

3.3M/s

For Loop

812K/s

Fastest: RegEx (4.1x faster)

View exact numbers

✓ RegEx: 3,318,171 ops/sec
• For Loop: 812,415 ops/sec

Mobile Results:

Chrome 13 runs

RegEx

2.1M/s

For Loop

670K/s

Fastest: RegEx (3.2x faster)

View exact numbers

✓ RegEx: 2,127,065 ops/sec
• For Loop: 670,295 ops/sec

Firefox 6 runs

For Loop

7.8M/s

RegEx

2.4M/s

Fastest: For Loop (3.2x faster)

View exact numbers

✓ For Loop: 7,788,368 ops/sec
• RegEx: 2,404,199 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
RegEx
For Loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0

Browser/OS: Firefox 148 on Linux

View result in a separate tab

For Loop

38.5M/s

RegEx

11.3M/s

View exact numbers

Test name	Executions per second
✓ For Loop	38,465,124 Ops/sec
RegEx	11,345,220 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which outlines two different approaches to test the performance of a password validation script:

1. **RegEx**: This option uses a regular expression (RegEx) to validate the password. A RegEx is a string that defines a search pattern used to match character combinations.
2. **For Loop**: This option uses a traditional `for` loop to iterate through each character in the password and check if it's a digit using the `charCodeAt()` method.

**Options Compared**

The benchmark compares the performance of two different approaches:

1. RegEx
2. For Loop

Both options have their pros and cons:

**RegEx:**

Pros:

* Concise and expressive, making it easy to read and maintain.
* Can be easily extended or modified by simply changing the pattern.

Cons:

* May be slower than a traditional `for` loop due to the overhead of creating and executing the regular expression engine.
* Can be less intuitive for developers without experience with RegEx patterns.

**For Loop:**

Pros:

* Typically faster than RegEx due to the simplicity of iteration using a `for` loop.
* More familiar to developers who are used to working with loops.

Cons:

* May require more code and maintenance effort compared to RegEx.
* Can be less readable and maintainable, especially for complex patterns.

**Library Usage**

The benchmark uses the `RegExp` object, which is a built-in JavaScript library that provides regular expression matching. The `RegExp` object allows developers to create and execute RegEx patterns, making it easy to validate passwords using this approach.

**Special JS Features or Syntax**

There are no special JS features or syntax mentioned in the provided benchmark definition. However, if you're interested in exploring other options, some alternatives include:

* Using a library like `regex-perf` or `regex-approximator` to optimize RegEx performance.
* Using a different iteration method, such as `while` loops or `forEach()` methods.

**Other Alternatives**

If you're looking for alternative benchmarking tools, some popular options include:

1. **Benchmark.js**: A JavaScript benchmarking library that provides a simple and intuitive API for creating benchmarks.
2. **micro-benchmark**: A lightweight benchmarking library specifically designed for JavaScript microbenchmarks.
3. **jsperf**: A widely-used benchmarking tool that allows developers to compare the performance of different JavaScript code snippets.

Keep in mind that each alternative has its own strengths and weaknesses, and may be more or less suitable depending on your specific use case and requirements.

RegEx vs For Loop (version: 0)

-

Comparing performance of: `RegEx vs For Loop`

Created: 6 years ago by: Guest

Go to the latest result

RegEx

For Loop

Historical Performance Data aggregated from 166 community runs

Desktop Results:

Chrome 106 runs

Firefox 35 runs

Other 6 runs

Mobile Results:

Chrome 13 runs

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

RegEx vs For Loop (version: 0)

-

Comparing performance of: RegEx vs For Loop

Created: 6 years ago by: Guest

Go to the latest result

RegEx

For Loop

Historical Performance Data aggregated from 166 community runs

Desktop Results:

Chrome 106 runs

Firefox 35 runs

Other 6 runs

Mobile Results:

Chrome 13 runs

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `RegEx vs For Loop`