Benchmark: RegEx.test vs. Inline RegEx.test

Script Preparation code:

var string = "Hello world!";
var regex = /Hello/;

Tests:

RegEx.test
regex.test(string);
Inline
/Hello/.test(string);

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

RegEx.test

47.5M/s

Inline

44.5M/s

View exact numbers

✓ RegEx.test: 47,504,280 ops/sec
• Inline: 44,480,432 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.test
Inline

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Linux

View result in a separate tab

RegEx.test

52.1M/s

Inline

49.0M/s

View exact numbers

Test name	Executions per second
✓ RegEx.test	52,132,424 Ops/sec
Inline	49,012,484 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 explanation of the provided benchmark.

**Benchmark Overview**

The benchmark compares two approaches for testing regular expressions (RegEx) in JavaScript: using a dedicated function `regex.test()` and using inline RegEx tests with the `/` syntax.

**Options Compared**

Two options are being compared:

1. **`regex.test(string)`**: This approach uses a separate function, `regex.test()`, to execute the RegEx test.
2. **`/Hello/.test(string)`**: This approach uses inline RegEx testing with the `/` syntax.

**Pros and Cons of Each Approach**

**`regex.test()` Approach:**

Pros:

* Separation of concerns: The function is specifically designed for testing, making it easier to maintain and reuse.
* Potential for optimization: The implementation of `test()` might be optimized for performance.

Cons:

* Overhead of function call: Creating a new function object and executing the test might incur some overhead.

**Inline RegEx Testing (`/Hello/.test(string)`)**

Pros:

* Simple and concise: Inline testing is straightforward and easy to read.
* Fewer overheads compared to creating a separate function.

Cons:

* Limited reusability: The inline RegEx test is tied to the specific string being tested, making it harder to reuse.

**Other Considerations**

Both approaches have implications for the JavaScript engine's caching and optimization mechanisms. The `regex.test()` approach might benefit from more aggressive caching and inlining due to its dedicated function nature. In contrast, the inline RegEx testing approach might be subject to more frequent cache invalidation and potential performance regressions.

**Library/Function**

No specific libraries or functions are mentioned in the benchmark definition. However, it's worth noting that `regex.test()` is likely a part of the JavaScript language itself or a widely available library function.

**Special JS Feature/Syntax**

The benchmark uses regular expressions (RegEx) which are a built-in feature of JavaScript. No special syntax or features beyond standard RegEx are used in this benchmark.

**Alternatives**

For measuring performance, you can consider using other frameworks and tools like:

* WebPageTest: A comprehensive tool for web performance testing.
* Google's Benchmarking Tool: A benchmarking library for Node.js applications.
* Microbenchmark (for JavaScript): A popular microbenchmarking library.

Keep in mind that each of these alternatives has its strengths, weaknesses, and specific use cases.

RegEx.test vs. Inline RegEx.test (version: 0)

Comparing performance of: `RegEx.test vs Inline`

Created: 2 years ago by: Guest

Go to the latest result

RegEx.test

Inline

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 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.test vs. Inline RegEx.test (version: 0)

Comparing performance of: RegEx.test vs Inline

Created: 2 years ago by: Guest

Go to the latest result

RegEx.test

Inline

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 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):

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Comparing performance of: `RegEx.test vs Inline`