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parseInt vs Number #4809345639
(version: 0)
Comparing performance of:
parseInt vs Number
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var str = "42";
Tests:
parseInt
const res = parseInt(str);
Number
const res = Number(str);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
parseInt
Number
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, the options compared, pros and cons of each approach, and other considerations. **What is being tested?** The benchmark compares two functions: `parseInt` and `Number`, both used to convert a string representation of an integer to its numeric value. The test cases focus on converting the string "42" to an integer using these two functions. **Options compared** The two options are: 1. `parseInt(str)`: Converts a string to an integer, interpreting the string as an integer literal if possible, or by parsing the string and returning a number if it represents an integer. 2. `Number(str)`: Converts a string to a number, without attempting to interpret the string as an integer. **Pros and cons of each approach** 1. `parseInt(str)`: * Pros: Can handle non-integer strings by ignoring the non-numeric characters, which might be useful in some scenarios. * Cons: Can lead to unexpected behavior if the input string is not a valid integer representation, as it can return incorrect results or throw errors. 2. `Number(str)`: * Pros: Always returns a number, even if the conversion fails, and does not attempt to interpret the string as an integer. * Cons: May lead to slower performance compared to `parseInt`, as it has to perform additional checks. **Library and syntax used** The benchmark uses JavaScript's built-in `Number` function, which converts a string to a number by attempting to parse the string using a locale-dependent numeric conversion algorithm. The `parseInt` function is also part of the JavaScript standard library. No special JavaScript features or syntax are being tested in this benchmark. **Other alternatives** Other ways to convert a string to an integer in JavaScript could include: * Using a regular expression to extract the numeric value from the string and then converting it to an integer using `parseInt` or `Number`. * Using a custom function that attempts to parse the string as an integer, handling errors and edge cases manually. * Using a library like Moment.js or other date-time libraries that provide integer parsing functionality. Keep in mind that these alternatives might not be as optimized or efficient as the built-in functions used by `parseInt` and `Number`. The provided benchmark result shows that both `parseInt` and `Number` are capable of converting the string "42" to an integer, but with slightly different performance characteristics. The `Number` function seems to have a slight edge in terms of execution speed, while `parseInt` might be more forgiving for invalid input strings.
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