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typeof number vs. Number.isNan vs. isNan
(version: 0)
Comparing performance of:
typeof vs Number.isNan vs isNaN
Created:
3 years ago
by:
Guest
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Tests:
typeof
typeof 5 === 'number'
Number.isNan
Number.isNaN(5)
isNaN
isNaN(5)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
typeof
Number.isNan
isNaN
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 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
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<iframe src="https://measurethat.net/Embed?id=625367" width="100%" height="500px"></iframe>
Test name
Executions per second
typeof
566203008.0 Ops/sec
Number.isNan
625986176.0 Ops/sec
isNaN
634555136.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**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.
Related benchmarks:
typeof vs typeof isNaN
typeof x === 'number' vs Number.isNaN(x)
typeof x === 'number' vs isNaN(x) rtestset22
typeof number vs. Number.isNan vs. isNan vs self comparison. Versus let
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