Benchmark: isNaN vs Number.isNaN

Tests:

global isNaN
isNaN(9)
method isNaN
Number.isNaN(9)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
global isNaN
method isNaN

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36 OPR/95.0.0.0 (Edition beta)

Browser/OS: Opera 95 on Windows 8.1

View result in a separate tab

Test name	Executions per second
global isNaN	2915977.2 Ops/sec
method isNaN	3133504.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking test cases and explain what is being tested.

**Benchmark Overview**

The benchmark tests two approaches to check if a number is NaN (Not a Number): using the global `isNaN` function versus calling it as a method on the `Number` object (`Number.isNaN()`).

**Options Compared**

1. **Global `isNaN`**: This approach checks if the `isNaN` function is available globally, without any context or wrapper.
2. **Method call on `Number` object (`Number.isNaN()`)**: This approach tests if the `Number.isNaN()` method exists and can be called directly on the `Number` object.

**Pros and Cons**

1. **Global `isNaN`**:
	* Pros: This approach is simpler, as it doesn't require any additional context or wrapper.
	* Cons: If the browser or environment doesn't have a global `isNaN` function available, this test will fail.
2. **Method call on `Number` object (`Number.isNaN()`)**:
	* Pros: This approach ensures that the method is called correctly and provides a more robust way to check for NaN values.
	* Cons: It requires an additional step (calling the method as a property of the `Number` object), which might add overhead.

**Library Usage**

None of the test cases use any external libraries.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in these test cases. They only rely on standard ECMAScript functionality.

**Other Alternatives**

If you were to create a similar benchmark, you could also include tests for:

* Checking if `isNaN` is available as a global variable using `typeof isNaN === 'function'`
* Using other approaches like `Number.isFinite()` or custom implementation
* Testing different browser versions or platforms

Keep in mind that the specific test cases and their variations will depend on your goals and the specific requirements of your project.

In summary, this benchmark tests two common ways to check if a number is NaN: using the global `isNaN` function versus calling it as a method on the `Number` object. The benchmark provides insights into which approach is faster and more reliable in different browser environments.

Related benchmarks:

isNaN vs Number.isNaN (version: 0)

Comparing performance of: global isNaN vs method isNaN

Created: one year ago by: Guest

Jump to the latest result

global isNaN

method isNaN

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):