Benchmark: typeof number vs. Number.isNan vs. isNan

Tests:

typeof
typeof 5 === 'number'
Number.isNan
Number.isNaN(5)
isNaN
isNaN(5)

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 14 runs

typeof

177.8M/s

isNaN

53.7M/s

Number.isNan

44.9M/s

Fastest: typeof (4.0x faster)

View exact numbers

✓ typeof: 177,789,472 ops/sec
• isNaN: 53,650,168 ops/sec
• Number.isNan: 44,862,920 ops/sec

Firefox 5 runs

isNaN

634.7M/s

Number.isNan

630.2M/s

typeof

550.9M/s

Fastest: isNaN (1.2x faster)

View exact numbers

✓ isNaN: 634,747,840 ops/sec
• Number.isNan: 630,163,520 ops/sec
• typeof: 550,879,936 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
typeof
Number.isNan
isNaN

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser/OS: Firefox 147 on Windows

View result in a separate tab

isNaN

634.6M/s

Number.isNan

626.0M/s

typeof

566.2M/s

View exact numbers

Test name	Executions per second
✓ isNaN	634,555,136 Ops/sec
Number.isNan	625,986,176 Ops/sec
typeof	566,203,008 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript benchmark test case, specifically designed to compare the performance of three different approaches for checking if a variable is a number: `typeof`, `Number.isNan`, and `isNaN`.

**Test Cases**

There are three individual test cases:

1. **`typeof 5 === 'number'`**: This test case checks if the result of calling `typeof` on the variable `5` is equal to `'number'`.
2. **`Number.isNaN(5)`**: This test case calls the `Number.isNaN()` function with the argument `5`, which returns a boolean value indicating whether the input number is NaN (Not a Number).
3. **`isNaN(5)`**: This test case calls the global function `isNaN()` with the argument `5`.

**Comparison and Options**

The three test cases are designed to compare the performance of these different approaches:

1. **`typeof 5 === 'number'`**:
	* Pros: Simple and straightforward, easy to read.
	* Cons: May incur a slight overhead due to string comparison.
2. **`Number.isNaN(5)`**:
	* Pros: Fast and efficient, optimized for performance.
	* Cons: Requires the `Number` object to be available in the scope, which may not always be the case.
3. **`isNaN(5)`**:
	* Pros: Global function, widely supported and compatible with older browsers.
	* Cons: May incur a slight overhead due to the global function lookup.

**Library Usage**

None of the test cases explicitly use any JavaScript libraries or frameworks.

**Special JS Features/Syntax**

The benchmark does not utilize any special JavaScript features or syntax.

**Other Considerations**

When comparing these approaches, it's essential to consider factors like:

* Performance: How fast do each approach execute?
* Readability: Which approach is easiest to read and understand?
* Compatibility: Are the approaches compatible with older browsers or versions of JavaScript?

**Alternatives**

If you need to benchmark similar approaches, you might also want to consider testing:

* `Number.isInteger()`: An alternative for checking if a number is an integer.
* Using a custom implementation for `isNan()` and `isNaN()`, potentially optimized for specific use cases.

Keep in mind that the choice of approach depends on your specific requirements and constraints.

typeof number vs. Number.isNan vs. isNan (version: 0)

Comparing performance of: `typeof vs Number.isNan vs isNaN`

Created: 3 years ago by: Guest

Go to the latest result

typeof

Number.isNan

isNaN

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 14 runs

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

typeof number vs. Number.isNan vs. isNan (version: 0)

Comparing performance of: typeof vs Number.isNan vs isNaN

Created: 3 years ago by: Guest

Go to the latest result

typeof

Number.isNan

isNaN

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 14 runs

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `typeof vs Number.isNan vs isNaN`