Benchmark: array vs regex 2

Script Preparation code:

var array = ['devlocal', 'dev', 'sim', 'beta', 'proddr', 'prod'];
var regex = /^(devlocal|dev|sim|beta|proddr|prod)$/;
var testValue = ['pr', 'od'].join('')

Tests:

Array
array.includes(testValue)
Regex
regex.test(testValue)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array
Regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and analyze what's being tested, compared, and the pros/cons of each approach.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches: using an array (`array.includes(testValue)`) versus using a regular expression (`regex.test(testValue)`).

**What is being tested?**

In this case, we're testing the execution speed of two JavaScript methods:

1. `array.includes()`: This method checks if a value exists in an array.
2. `regex.test()`: This method tests if a string matches a given regular expression pattern.

**Options compared**

The benchmark compares these two options directly: using an array (`array.includes(testValue)`) versus using a regular expression (`regex.test(testValue)`).

**Pros and Cons of each approach**

1. **Array (`array.includes(testValue)`)**:
	* Pros:
		+ Fast lookup times due to binary search (on modern browsers)
		+ Compact syntax
	* Cons:
		+ Limited flexibility, as it only checks for exact matches within the array
2. **Regular Expression (`regex.test(testValue)`)**:
	* Pros:
		+ Flexible pattern matching with support for anchors, flags, and quantifiers
		+ Can be used for more complex pattern matching tasks
	* Cons:
		+ Generally slower than array-based lookups due to regex engine overhead
		+ More verbose syntax

**Library usage**

There is no explicit library mentioned in the benchmark definition or test cases. However, it's likely that a built-in JavaScript function or a third-party library (e.g., `regex-js`) is being used for regular expression matching.

**Special JS feature/syntax**

The benchmark uses a special JavaScript feature: template literals (`"var testValue = ['pr', 'od'].join('')"`). This allows the creation of a string by concatenating values using an empty separator. Modern browsers support this syntax, but older versions might not.

**Other alternatives**

If you're looking for alternative approaches to performance-critical code:

* **Regex alternatives**: Depending on your specific use case, you might consider using other regex flavors or libraries (e.g., `RegExp` in Node.js) that can provide better performance.
* **Native methods**: If you need a simple lookup or pattern matching task, you could also consider using native methods like `Array.indexOf()` or `String.prototype.match()`, which are optimized for speed.

In summary, this benchmark compares the performance of two approaches: using an array (`array.includes(testValue)`) versus using a regular expression (`regex.test(testValue)`). While array-based lookups offer fast execution times and compact syntax, regular expressions provide flexibility but come with potential performance overhead.

Related benchmarks:

array vs regex 2 (version: 0)

Comparing performance of: Array vs Regex

Created: 2 years ago by: Guest

Jump to the latest result

Array

Regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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