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isNaN vs regex
(version: 0)
Comparing performance of:
isNaN vs regex
Created:
2 years ago
by:
Registered User
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Tests:
isNaN
isNaN('123') isNaN('abc')
regex
/^\d+$/.test('123'); /^\d+$/.test('abc')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
isNaN
regex
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years 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
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<iframe src="https://measurethat.net/Embed?id=492588" width="100%" height="500px"></iframe>
Test name
Executions per second
isNaN
4902695.0 Ops/sec
regex
27185036.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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!
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