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toFixed vs toPrecision vs Math.round() 2 decimal
(version: 0)
Comparing performance of:
toFixed 2 decimals vs toPrecision 2 decimals vs Math.round 2 decimals
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var someFloat = 0.123456789;
Tests:
toFixed 2 decimals
someFloat.toFixed(2);
toPrecision 2 decimals
someFloat.toPrecision(2)
Math.round 2 decimals
Math.round(someFloat * 100 + Number.EPSILON) / 100
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
toFixed 2 decimals
toPrecision 2 decimals
Math.round 2 decimals
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0
Browser/OS:
Firefox 146 on Windows
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<iframe src="https://measurethat.net/Embed?id=623347" width="100%" height="500px"></iframe>
Test name
Executions per second
toFixed 2 decimals
21387370.0 Ops/sec
toPrecision 2 decimals
15494875.0 Ops/sec
Math.round 2 decimals
994264320.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark test case that compares the performance of three different methods for rounding a floating-point number: `toFixed`, `toPrecision`, and `Math.round()` with 2 decimal places. **Test Case Explanation** The test case consists of three individual test cases, each representing a different method for rounding the same floating-point number, `someFloat`. The test cases are: 1. `toFixed 2 decimals`: This test case measures the performance of using the `toFixed` method to round the number to 2 decimal places. 2. `toPrecision 2 decimals`: This test case measures the performance of using the `toPrecision` method to round the number to 2 decimal places. 3. `Math.round 2 decimals`: This test case measures the performance of using the `Math.round()` function with 2 decimal places. **Library and Purpose** In this benchmark, the `Number.EPSILON` property is used in the third test case (`Math.round 2 decimals`). `Number.EPSILON` is a constant that represents the smallest positive value that is different from zero. In JavaScript, when using `Math.round()` with a second argument (the number of decimal places), it takes into account this epsilon value to avoid rounding errors. **Special JS Feature/Syntax** In none of the provided code snippets are special JS features or syntax used, such as async/await, generators, or promises. The test cases use standard JavaScript methods and operators. **Options Compared** The three options compared in this benchmark are: * `toFixed` method * `toPrecision` method * `Math.round()` function with 2 decimal places Each of these options has its own pros and cons: * **`toFixed` method**: This method is simple and easy to use, but it may not be suitable for all cases. It rounds the number to a fixed number of decimal places, which may lead to precision errors if the original value is not exactly representable. * **`toPrecision` method**: This method provides more control over the rounding process, allowing users to specify the desired number of significant figures. However, it may be slower than `toFixed` due to its more complex implementation. * **`Math.round()` function with 2 decimal places**: This option is useful when you need to round a number to a specific precision and want to avoid using `toFixed` or `toPrecision`. However, it requires careful handling of edge cases, such as very large numbers. **Other Considerations** When choosing between these options, consider the following factors: * Precision requirements: How many decimal places do you need? Do you need more significant figures? * Performance: Do you prioritize speed over precision or vice versa? * Complexity: Are you willing to use a more complex method (e.g., `toPrecision`) for better results? **Other Alternatives** If you're looking for alternative methods for rounding numbers in JavaScript, consider: * Using a library like `decimal.js` for precise arithmetic operations * Implementing your own rounding algorithm using bitwise operations or other mathematical techniques Keep in mind that these alternatives may have different trade-offs and requirements compared to the options discussed above.
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