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parseInt vs Number
(version: 0)
Comparing performance of:
parse vs Number
Created:
5 years ago
by:
Guest
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Tests:
parse
parseInt('1603915652', 10)
Number
Number('1603915652')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
parse
Number
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
Browser/OS:
Chrome 136 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=603481" width="100%" height="500px"></iframe>
Test name
Executions per second
parse
168619392.0 Ops/sec
Number
145542672.0 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. **Benchmark Definition** The benchmark definition specifies two different ways to convert a string to an integer: using `parseInt` and `Number`. The first one uses the `parseInt` function with a radix of 10, which means it will attempt to parse the string as a decimal number. ```javascript // parseInt example console.log(parseInt('1603915652', 10)); // outputs: 1603915652 // Number example console.log(Number('1603915652')); // outputs: 1603915652 ``` **Options Compared** Two options are being compared: 1. **parseInt**: Uses the `parseInt` function with a radix of 10 to convert the string to an integer. 2. **Number**: Uses the built-in `Number` function to convert the string to an integer. **Pros and Cons** * **parseInt**: + Pros: Can be faster for very large integers, as it avoids the overhead of creating a Number object and uses a simple radix-based parsing algorithm. + Cons: Can fail if the input string is not in the correct format (e.g., if it contains non-numeric characters) or if the radix is not specified correctly. Additionally, `parseInt` can be slower than `Number` for small integers due to its overhead. * **Number**: + Pros: More robust and safer, as it automatically handles formatting issues and avoids the need to specify a radix. It's also generally faster than `parseInt`. + Cons: Can be slower than `parseInt` for very large integers due to its object creation overhead. **Library/Function Used** * **Number**: The built-in JavaScript function `Number()` uses the ECMAScript specification for parsing numeric literals, which includes a more robust implementation of integer conversion compared to `parseInt`. There are no special JS features or syntax being tested in this benchmark. **Other Alternatives** If you need to convert a string to an integer, you can also use other functions like: * **BigInt**: For very large integers, you can use the `BigInt` function, which provides a more efficient and robust way of working with integers. * **parseInt() with radix 0**: Some versions of JavaScript allow using `parseInt()` with a radix of 0, which will attempt to parse the string as an integer using heuristics (e.g., treating '0' as an integer). However, these alternatives are not directly comparable to `Number` and `parseInt`, as they have different use cases and performance characteristics.
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