Benchmark: isNaN vs regex - MeasureThat.net

Tests:

isNaN
isNaN('123') isNaN('abc')
regex
/^\d+$/.test('123'); /^\d+$/.test('abc')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isNaN
regex

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and considered.

**Benchmark Overview**

The test cases are comparing two approaches to check for NaN (Not a Number) values in JavaScript:

1. `isNaN('123')` - Using the built-in `isNaN()` function.
2. `/^\\d+$/.test('123');\r\n/^\\d+$/.test('abc')` - Using a regular expression.

**Options Compared**

The two options are compared to determine which one is faster and more efficient.

**Pros and Cons of Each Approach:**

1. **`isNaN()` function:**
	* Pros:
		+ Simple and straightforward.
		+ Widely supported and tested.
	* Cons:
		+ May not be as fast as a regular expression, especially for large inputs.
2. **Regular Expression (`/^\\d+$/.test()`)**:
	* Pros:
		+ Can match multiple patterns, including numbers.
		+ Can be more efficient than `isNaN()` for certain use cases.
	* Cons:
		+ More complex and harder to read.
		+ May not be as widely supported or tested as the built-in `isNaN()` function.

**Library Used**

In this benchmark, no libraries are explicitly mentioned. However, the regular expression `/^\\d+$/.test()` uses a library-like syntax for regex patterns.

**Special JS Feature or Syntax:**

None of the test cases use special JavaScript features or syntax that requires explanation.

**Other Alternatives**

For checking NaN values, other alternatives to `isNaN()` include:

* Using `Number.isNaN()`, which is a more modern and consistent way to check for NaN values.
* Creating a custom function using a try-catch block to catch the `NaN` error.

However, these alternatives are not explicitly mentioned in this benchmark.

**Benchmark Preparation Code**

The provided JSON does not contain any script preparation code. It's likely that the script is generated automatically by MeasureThat.net or another tool.

I hope this explanation helps software engineers understand what's being tested and compared in this JavaScript microbenchmark!

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
isNaN	4902695.0 Ops/sec
regex	27185036.0 Ops/sec

Related benchmarks:

isNaN vs regex (version: 0)

Comparing performance of: isNaN vs regex

Created: 11 months ago by: Registered User

Jump to the latest result

isNaN

regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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