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toFixed() vs Math.round().toString()
(version: 0)
Comparing performance of:
toFixed() vs Math.round(someFloat).toString()
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var someFloat = 123.456;
Tests:
toFixed()
someFloat.toFixed();
Math.round(someFloat).toString()
Math.round(someFloat).toString();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
toFixed()
Math.round(someFloat).toString()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 OPR/114.0.0.0
Browser/OS:
Opera 114 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=565252" width="100%" height="500px"></iframe>
Math.round(someFloat).toString()
5.3M/s
toFixed()
4.2M/s
View exact numbers
Test name
Executions per second
✓
Math.round(someFloat).toString()
5,335,279 Ops/sec
toFixed()
4,233,266 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! Measuring performance differences between various approaches to achieve a common goal is essential in software development. In this case, we're testing two methods: `toFixed()` and `Math.round().toString()` for rounding a floating-point number. **What are we comparing?** We're comparing the performance of these two rounding methods on a single example value (`someFloat = 123.456`). The goal is to determine which method is faster. **Options compared:** * `toFixed()`: A built-in JavaScript method that rounds a number to a fixed number of decimal places. * `Math.round().toString()`: A combination of the `round()` and `toString()` methods, which first rounds the number to an integer using `round()` and then converts it to a string using `toString()`. **Pros and Cons:** * **toFixed():** * Pros: + Built-in method, so no additional library is required. + Faster execution time due to optimized C++ implementation under the hood. * Cons: + Limited control over precision (fixed number of decimal places). + May lead to inaccurate results for non-integer values with a large number of decimal places. * **Math.round().toString():** * Pros: + More flexible and accurate, as the precision is determined by the number of decimal places. + Can be more readable in certain situations (e.g., when displaying currency or prices). * Cons: + Requires two method calls (`round()` and `toString()`), which might incur additional overhead. + May not perform as well for very large numbers due to the unnecessary conversion step. **Library usage:** None of the methods use a library. The built-in functions (`toFixed()` and `Math.round()`) are sufficient for this benchmark. **Special JS feature or syntax:** There is no special JavaScript feature or syntax used in these test cases. The focus is on comparing the performance of two straightforward rounding methods. **Other alternatives:** Some alternative approaches to consider when rounding numbers include: * **Number.EPSILON**: A property that represents the smallest positive difference between 1 and any number (approximately equal to 2.22046e-16). You can use this value as a threshold for determining whether two numbers are close enough to be considered equal, allowing for more accurate comparisons. * **BigInt**: For very large numbers, consider using `BigInt` to avoid potential performance issues with JavaScript's built-in number type. In summary, when rounding numbers in JavaScript, it's essential to weigh the trade-offs between precision, readability, and performance. The choice ultimately depends on your specific use case and requirements.
Related benchmarks
toFixed vs Math.round() - result as a number
toFixed vs toPrecision vs Math.round() to 1 decimal place
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