Benchmark: regexs vs. loop exp2

HTML Preparation code:

var host = 'api-staging.eurostar.com';

Script Preparation code:

var host = 'api-staging.eurostar.com';
var allowedRedirectHostsRegExp = new RegExp('eurostar.com|localhost', 'i');

Tests:

regexs
allowedRedirectHostsRegExp.test(host);
loop
['eurostar.com', 'localhost'].includes(host);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regexs
loop

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36 Edg/109.0.1518.70

Browser/OS: Chrome 109 on Windows

View result in a separate tab

Test name	Executions per second
regexs	2809497.5 Ops/sec
loop	6921598.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases for you.

**What is being tested?**

MeasureThat.net is testing two different approaches to check if a host string matches a specific allowed redirect host regex pattern: regular expressions (regex) versus loops.

**Options compared**

The two options being compared are:

1. **Regular Expressions (Regex)**:
	* Using the `RegExp` object and its `test()` method.
	* The regex pattern is defined in the "Script Preparation Code" section of the benchmark definition (`allowedRedirectHostsRegExp = new RegExp('eurostar.com|localhost', 'i');`)
2. **Loop**:
	* Using the `includes()` method of an array.
	* The loop checks if the host string is present in the allowed redirect hosts list (`['eurostar.com', 'localhost']`)

**Pros and Cons**

1. **Regular Expressions (Regex)**:
	Pros:

* Can be more efficient for larger patterns or complex matching requirements.
	* Often used in text processing and validation.
	Cons:

* Can be slower than loops for simple string comparisons.
	* May have performance overhead due to the complexity of regex engines.
2. **Loop**:
	Pros:

* Typically faster than regex for simple string comparisons.
	* Easier to understand and maintain, especially for small lists or patterns.
	Cons:

* Limited scalability for larger datasets or complex matching requirements.

**Library/JavaScript feature**

The `RegExp` object is a built-in JavaScript library that provides support for regular expressions. The `test()` method is used to check if the host string matches the regex pattern.

**Special JS feature**

None mentioned in this benchmark definition.

**Other alternatives**

For large-scale performance comparisons, MeasureThat.net might also consider other approaches, such as:

1. **Native browser APIs**: Depending on the target platform and browser versions, native APIs like ` navigator.platform` or `Intl.Collator` might be more suitable for certain use cases.
2. **Native JavaScript functions**: Built-in JavaScript functions like `String.prototype.startsWith()` or `Array.prototype.includes()` might be faster than regular expressions or loops for specific use cases.

Keep in mind that these alternatives would require changes to the benchmark definition and test cases, as well as adjustments to the measurement and analysis of results.

Please let me know if you have any further questions or need more clarification!

Related benchmarks:

regexs vs. loop exp2 (version: 0)

Comparing performance of: regexs vs loop

Created: one year ago by: Guest

Jump to the latest result

regexs

loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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