Benchmark: array.some vs regex.test

Script Preparation code:

var appState = "active";
var regex = /inactive|background/;
var arr = ['inactive', 'background'];

Tests:

array.some
array.some(v => v === appState)
regex.test
regex.test(appState);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array.some
regex.test

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 on MeasureThat.net.

**What is being tested?**

The provided benchmark tests two different approaches to check if an element exists in an array:

1. `array.some(v => v === appState)`: This uses the `some` method, which returns `true` as soon as it finds at least one element in the array that satisfies the condition.
2. `regex.test(appState)`: This uses a regular expression to test if `appState` matches any part of the regex pattern.

**Options being compared**

The benchmark compares the performance of these two approaches:

* `array.some`
* `regex.test`

**Pros and Cons:**

1. **array.some**
	* Pros:
		+ More efficient, as it stops iterating as soon as it finds a match.
		+ Can be more readable, as the condition is self-explanatory.
	* Cons:
		+ May not perform well for very large arrays, as it has to iterate through each element.
2. **regex.test**
	* Pros:
		+ Can be used to test for multiple patterns at once, making it useful for more complex scenarios.
	* Cons:
		+ Generally slower than `array.some`, especially for simple cases.
		+ May have performance implications if the regex pattern is complex.

**Library usage**

Neither of the tested libraries is explicitly mentioned. However, in the context of JavaScript and regular expressions, it's likely that these tests are using built-in functions rather than external libraries.

**Special JS features or syntax**

There are no special JS features or syntax used in this benchmark.

**Other alternatives**

If you're looking for alternative approaches to check if an element exists in an array:

* **Array.prototype.includes()**: This is a modern JavaScript method that returns `true` if the specified value is found in the array. It's often considered more readable and efficient than `some`.
* **Array.prototype.findIndex()**: This method returns the index of the first element that satisfies the condition, or -1 if no such element exists.

Note that these alternatives might have slightly different performance characteristics depending on the specific use case and browser/JavaScript environment.

The benchmark's results can be interpreted as follows:

* The `regex.test` approach takes advantage of Chrome's optimized regex engine to execute faster.
* The `array.some` approach performs similarly well, despite being slower than `regex.test` for this specific test case.

Keep in mind that the actual performance differences may vary depending on the specific input data and JavaScript environment.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser/OS: Chrome 115 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array.some	0.0 Ops/sec
regex.test	13465114.0 Ops/sec

Related benchmarks:

array.some vs regex.test (version: 0)

Comparing performance of: array.some vs regex.test

Created: one year ago by: Guest

Jump to the latest result

array.some

regex.test

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):