Benchmark: Array.some vs regex

Tests:

Regex
new RegExp(/@fs|@id|@vite|@react|node_modules/, 'gm').test('/admin/@fs/Users/virk/code/medusa/issues/additional_data_check/node_modules/vite/dist/client/env.mjs')
Array.some
["@fs", "@id", "@vite", "@react", "node_modules"].some((chunk) => '/admin/@fs/Users/virk/code/medusa/issues/additional_data_check/node_modules/vite/dist/client/env.mjs'.includes(chunk))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Array.some

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Regex	7147804.0 Ops/sec
Array.some	72599576.0 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 on MeasureThat.net.

The provided benchmark compares two approaches to test for the presence of specific strings in a given string: using `RegExp` and using the `some()` method with an array of strings.

**What is being tested?**

The two approaches being compared are:

1. **RegExp**: Using a regular expression to search for the specified strings in the input string.
2. **Array.some()**: Using the `some()` method to check if any element in the array matches the condition (i.e., if the input string includes each of the specified strings).

**Options being compared:**

* RegExp: The regular expression `/@fs|@id|@vite|@react|node_modules/` is used to search for the presence of the specified strings.
* Array.some(): An array of strings `[@fs, @id, @vite, @react, node_modules]` is used to check if any element in the array matches the condition (i.e., if the input string includes each of the specified strings).

**Pros and Cons:**

1. **RegExp**:
	* Pros:
		+ More flexible and powerful for complex matching scenarios.
		+ Can be optimized for performance using flags like `g` (global) and `m` (multiline).
	* Cons:
		+ More CPU-intensive due to the overhead of compiling and executing a regular expression.
		+ May be slower than `some()` in some cases, especially when dealing with large strings.
2. **Array.some()**:
	* Pros:
		+ More memory-efficient since only one string needs to be processed at a time.
		+ Can be faster for small to medium-sized strings due to the optimization of JavaScript's `some()` method.
	* Cons:
		+ Less flexible and powerful than RegExp for complex matching scenarios.
		+ May not perform as well as RegExp when dealing with large strings or multiple matches.

**Library:**

In this benchmark, there is no explicit library being used. However, if we consider the `RegExp` object as a part of the JavaScript standard library, it's worth noting that the regular expression itself uses some advanced JavaScript features, such as:

* The `gm` flags (global and multi-line), which are not enabled by default.
* The use of character classes (`@fs`, `@id`, etc.) and quantifiers (`|`, `?`, `*`, etc.).

**Special JS feature:**

There is no special JavaScript feature or syntax being used in this benchmark. However, it's worth noting that the `some()` method is a built-in JavaScript method that uses a loop under the hood to iterate over the array elements.

**Alternatives:**

Other alternatives for testing string matching scenarios include:

* Using a different regular expression engine like Apache RegEx or LuaJIT.
* Implementing a custom string search algorithm, such as using a Boyer-Moore algorithm.
* Utilizing hardware acceleration through Web Workers or native modules (e.g., on Node.js).

In summary, the `RegExp` and `Array.some()` approaches being compared in this benchmark highlight the trade-offs between flexibility, performance, and memory efficiency when it comes to string matching scenarios in JavaScript.

Related benchmarks:

Array.some vs regex (version: 0)

Comparing performance of: Regex vs Array.some

Created: one year ago by: Guest

Jump to the latest result

Regex

Array.some

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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