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toFixed vs toPrecision vs Math.round() as float
(version: 0)
Comparing performance of:
parseFloat(toFixed(4)) vs toPrecision(4) vs Math.round(*10000)/10000
Created:
3 years ago
by:
Guest
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Script Preparation code:
var someFloat = 0.123456789;
Tests:
parseFloat(toFixed(4))
parseFloat(someFloat.toFixed(4));
toPrecision(4)
someFloat.toPrecision(4)
Math.round(*10000)/10000
Math.round(someFloat*10000)/10000
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
parseFloat(toFixed(4))
toPrecision(4)
Math.round(*10000)/10000
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. **Benchmark Purpose** The benchmark is designed to compare three different approaches for converting a floating-point number to a string representation with a specified number of decimal places: 1. `toFixed()` 2. `toPrecision()` 3. `Math.round()` followed by division by 10,000 and then rounding again **Options Compared** * `toFixed(4)`: This method returns a string representation of the float with exactly 4 decimal places. * `toPrecision(4)`: This method returns a string representation of the float with at most 4 significant digits. * `Math.round(*10000)/10000`: This approach first multiplies the float by 10,000, rounds it using `Math.round()`, and then divides the result by 10,000. **Pros and Cons** * **toFixed(4)**: + Pros: Easy to understand and use, produces a fixed-precision output. + Cons: May not be suitable for large numbers or numbers with many decimal places. * **toPrecision(4)**: + Pros: More flexible than `toFixed()`, can handle large numbers and numbers with many decimal places. + Cons: Can result in trailing zeros, which may not be desirable. * **Math.round(*10000)/10000**: + Pros: Can produce more accurate results for certain types of numbers (e.g., large integers). + Cons: May not be suitable for all use cases, as it involves extra operations and potential rounding errors. **Library and Special JS Features** The benchmark uses the `parseFloat()` function, which is a built-in JavaScript function. No external libraries are required. There are no special JavaScript features or syntax mentioned in this benchmark. **Other Alternatives** If you need to convert floating-point numbers to string representations with a specified number of decimal places, consider using other approaches, such as: * Using the `Number()` function with the desired precision: `Number(someFloat).toPrecision(4)` * Using the `BigInt()` function (for large integers): `BigInt(someFloat).toString(2)` (note that this will not produce a standard decimal representation) * Implementing your own custom solution using arithmetic and string manipulation. Keep in mind that each approach has its pros and cons, and the best choice depends on your specific use case.
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toFixed vs toPrecision vs Math.round() 22222
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