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parseInt vs Number vs +
(version: 0)
Comparing performance of:
number vs parseint vs +
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var text = '12';
Tests:
number
console.log(Number(text))
parseint
console.log(parseInt(text))
+
console.log(+text)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
number
parseint
+
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/122.0.0.0 Safari/537.36
Browser/OS:
Chrome 122 on Windows
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<iframe src="https://measurethat.net/Embed?id=509181" width="100%" height="500px"></iframe>
number
291K/s
+
266K/s
parseint
261K/s
View exact numbers
Test name
Executions per second
✓
number
290,972 Ops/sec
+
265,572 Ops/sec
parseint
261,052 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 analyzed. **Benchmark Overview** The benchmark is designed to compare the performance of three different ways to convert a string value "12" into a number in JavaScript: using `Number()`, `parseInt()`, and the unary plus operator (`+`). **What's Being Tested** In this benchmark, we're testing the execution time of each conversion method on a specific input value. The test cases are as follows: 1. `console.log(Number(text))`: This tests the `Number()` function. 2. `console.log(parseInt(text))`: This tests the `parseInt()` function. 3. `console.log(+text)`: This tests the unary plus operator (`+`). **Options Compared** The benchmark compares the performance of each conversion method: * `Number()`: Converts a string value to a number using the `Number()` function, which attempts to interpret the string as an integer or float. * `parseInt()`: Converts a string value to a number using the `parseInt()` function, which only interprets the first sequence of digits in the string and ignores any other characters. * Unary Plus Operator (`+`): Converts a string value to a number by implicitly applying the unary plus operator, which attempts to interpret the string as an integer. **Pros and Cons** Here's a brief summary of each conversion method: * `Number()`: Pros - Simple and straightforward. Cons - May not work correctly for non-numeric strings or strings with decimal points. In modern JavaScript, it's generally recommended to use `parseFloat()` instead. * `parseInt()`: Pros - Can handle strings with leading whitespace or other characters before the first digit sequence. Cons - Ignores any characters after the first digit sequence and returns NaN (Not a Number) if no valid digits are found. * Unary Plus Operator (`+`): Pros - Simple and widely supported. Cons - May not work correctly for non-numeric strings or strings with decimal points. **Library Usage** In this benchmark, none of the libraries are explicitly mentioned. **Special JavaScript Features or Syntax** There aren't any special JavaScript features or syntax being tested in this benchmark. **Other Considerations** When working with string-to-number conversions, consider the following: * Always validate user input to ensure it's a valid number. * Use `parseFloat()` instead of `Number()` for more accurate results, especially when dealing with decimal points. * Be aware of browser quirks and differences in how they handle numeric string conversions. **Alternative Approaches** Other ways to convert a string value to a number include: * Using a regular expression with the `match()` method: `text.match(/^\d+$/)[0]` * Using a library like Lodash's `parseNumber()`: `_lib.parseNumber(text)` * Implementing a custom parsing function using regex and/or arithmetic operations. Keep in mind that these alternatives might not be as simple or efficient as the original benchmark, but they can provide more flexibility or control over the conversion process.
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