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toFixed vs Round
(version: 0)
Comparing performance of:
ToFixed vs Round
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
ToFixed
Number(1.345).toFixed(2)
Round
Math.round(Number(1.345) * 100) / 100
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
ToFixed
Round
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand the JavaScript microbenchmark on MeasureThat.net. **What is being tested?** The benchmark compares two approaches for rounding numbers: `toFixed` and `round`. The tests measure the execution time of these two methods on different inputs (in this case, `1.345`). The goal is to determine which method is faster and more efficient. **Options compared:** There are only two options being tested: 1. **`toFixed(2)`**: This method converts a number to a string with a fixed number of decimal places. In this case, the input `1.345` will be converted to a string with 2 decimal places (`"1.35"`). 2. **`Math.round(Number(1.345) * 100) / 100`**: This method multiplies the input number by 100, rounds it using the `round` function, and then divides the result by 100. **Pros and Cons:** * **`toFixed(2)`**: + Pros: More concise and readable code. It converts the number to a string directly. + Cons: May lead to precision issues if the decimal places are not properly specified. * **`Math.round(Number(1.345) * 100) / 100`**: + Pros: Can handle larger numbers with more decimal places without sacrificing readability. + Cons: More complex and may be slower due to the multiplication and division operations. **Library/Features:** There are no libraries or special JavaScript features being used in this benchmark. The tests only involve built-in JavaScript methods (`toFixed` and `round`) and basic arithmetic operations. **Other considerations:** * **Precision**: When using `toFixed`, it's essential to specify the correct number of decimal places to avoid precision issues. * **Code readability**: While `toFixed` might be more concise, the second approach may be considered more readable due to its explicit multiplication and division steps. **Alternatives:** If you need to round numbers in JavaScript, you can use other methods like: * `Number.prototype.toFixed()` with a custom decimal place value * The `round()` function from libraries like MathJS or Luxon * Manual multiplication and division as shown in the benchmark However, these alternatives might not be as straightforward or concise as using `toFixed` directly.
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