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js math vs toLocaleString
(version: 0)
Benchmark.js
Comparing performance of:
Rounding vs localString
Created:
4 years ago
by:
Guest
Go to the latest result
Tests:
Rounding
const number = 1234.567 % 60 const c = Math.round(number * 10) / 10
localString
const number = 1234.567 % 60 const c = number.toLocaleString(undefined, { maximumFractionDigits: 1, minimumFractionDigits: 0 })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Rounding
localString
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/131.0.0.0 Safari/537.36
Browser/OS:
Chrome 131 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=580635" width="100%" height="500px"></iframe>
Rounding
154.2M/s
localString
74K/s
View exact numbers
Test name
Executions per second
✓
Rounding
154,207,312 Ops/sec
localString
74,242 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 Overview** MeasureThat.net provides a platform for users to create and run JavaScript microbenchmarks. The benchmark in question compares two approaches: manual rounding using `Math.round()` and utilizing the `toLocaleString()` method with precision options. **Test Cases** There are two individual test cases: 1. **Rounding**: This test case measures the performance of manually rounding a decimal number using `Math.round()`. The benchmark definition is: ```javascript const number = 1234.567 % 60 const c = Math.round(number * 10) / 10 ``` 2. **localString**: This test case measures the performance of using the `toLocaleString()` method with precision options to round a decimal number. The benchmark definition is: ```javascript const number = 1234.567 % 60 const c = number.toLocaleString(undefined, { maximumFractionDigits: 1, minimumFractionDigits: 0 }) ``` **Comparison Options** The two approaches being compared are: * **Manual Rounding**: Using `Math.round()` to round the decimal number. + Pros: - Simple and widely supported. - Easy to implement. + Cons: - May lead to rounding errors, especially for large numbers or precise values. - Can be slower due to the need for manual calculation. * **toLocaleString() with Precision Options**: Using the `toLocaleString()` method with precision options to round the decimal number. + Pros: - Provides more accurate results compared to manual rounding. - Often faster and more efficient, as it leverages the browser's built-in rounding capabilities. **Library:** * **Locale API**: The `toLocaleString()` method is part of the Locale API in JavaScript. This library provides a standardized way for applications to handle localized formatting of numbers, dates, and other numeric values. **Special JS Feature/Syntax:** None mentioned. Both test cases use standard JavaScript syntax. **Other Considerations** When choosing between manual rounding and using `toLocaleString()` with precision options, consider the trade-offs: * Accuracy: If precision is crucial, using `toLocaleString()` might be a better choice. * Performance: Manual rounding can lead to slower performance due to the need for manual calculation. However, this difference may not be significant in most cases. **Alternatives** Other approaches you could explore when comparing rounding methods include: * Using a dedicated library like the `decimal.js` library, which provides precise decimal arithmetic and rounding capabilities. * Implementing a custom rounding function using a more efficient algorithm, such as the "banker's rounding" method. * Considering alternative formatting options, like scientific notation or fixed-point notation. In summary, MeasureThat.net's benchmark compares two approaches to rounding decimal numbers: manual rounding using `Math.round()` and utilizing the `toLocaleString()` method with precision options. The latter approach provides more accurate results but may have slightly different performance characteristics compared to the former.
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