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parseInt() vs Number()
(version: 0)
Benchmark.js
Comparing performance of:
parseInt vs Number
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var tests = 1000 var toCast = "1"
Tests:
parseInt
while (i < tests) { parseInt(toCast) i++ }
Number
while (i < tests) { Number(toCast) i++ }
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:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 123 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=517496" width="100%" height="500px"></iframe>
Number
15.2M/s
parseInt
15.1M/s
View exact numbers
Test name
Executions per second
✓
Number
15,231,431 Ops/sec
parseInt
15,111,712 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Benchmark Definition** The benchmark is comparing the performance of two JavaScript functions: `parseInt()` and `Number()`. The function to be tested is applied to a string literal `"1"`, which represents an integer value. The goal of this benchmark is to determine which function is faster for this specific use case. **Script Preparation Code** The script preparation code is used to set up the testing environment before running each test case: ```javascript var tests = 1000; var toCast = "1"; ``` This code sets two variables: `tests`, which represents the number of iterations (in this case, 1000), and `toCast`, which holds the string literal `"1"` that will be passed to the functions being tested. **Html Preparation Code** The html preparation code is not provided, but it's likely used by the benchmarking framework to set up the testing environment in a web browser. This code is skipped for this explanation. **Test Cases** ### Test Case 1: `parseInt()` ```javascript while (i < tests) { parseInt(toCast) i++ } ``` This test case applies the `parseInt()` function to the string literal `"1"`, which returns an integer value of 1. The loop iterates 1000 times, applying the function to the string on each iteration. ### Test Case 2: `Number()` ```javascript while (i < tests) { Number(toCast) i++ } ``` This test case applies the `Number()` function to the string literal `"1"`, which also returns an integer value of 1. The loop iterates 1000 times, applying the function to the string on each iteration. **Pros and Cons** Both approaches have similar pros and cons: * **Pros:** + Both functions are widely supported in modern JavaScript engines. + They provide a simple way to convert strings to numbers. * **Cons:** + `parseInt()` is more aggressive in parsing the input string, which can lead to performance issues with certain inputs. For example, if the input string contains leading zeros or other characters, `parseInt()` may return incorrect results. + `Number()` is more relaxed in its parsing and returns NaN (Not a Number) for non-numeric strings. **Library Usage** In this benchmark, there are no external libraries used. **Special JavaScript Features/Syntax** There are no special JavaScript features or syntax used in these test cases. The code only uses basic JavaScript syntax and built-in functions. **Alternative Benchmarks** If you want to create a similar benchmark with different scenarios, consider the following alternatives: 1. Compare the performance of `Number()` with different input strings (e.g., `"1.2"`, `"hello world"`). 2. Add more test cases that use other numeric conversion methods, such as `parseFloat()`. 3. Introduce error handling and edge case testing to ensure the functions behave correctly in unexpected situations. 4. Explore performance differences between `parseInt()` and `Number()` for different data types (e.g., integers, floats, complex numbers). Keep in mind that the benchmark's scope is limited to comparing the performance of two specific functions on a single input string. Expanding the test cases and scenarios can provide more insights into the behavior of these functions under various conditions.
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