Benchmark: toFixed vs toPrecision vs Math.round() with num > 0

Script Preparation code:

var someFloat = 1234.123456789;

Tests:

toFixed(4)
someFloat.toFixed(4);
toPrecision(4).toString()
someFloat.toPrecision(4).toString();
(Math.round(*10000)/10000).toString()
(Math.round(someFloat*10000)/10000).toString();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toFixed(4)
toPrecision(4).toString()
(Math.round(*10000)/10000).toString()

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 27 days ago):

LLMs can make mistakes. Check important info.

This benchmark compares three different methods for rounding floating-point numbers in JavaScript:

* **`toFixed(4)`**: This method rounds the number `someFloat` to four decimal places and returns it as a string. 
* **`toPrecision(4).toString()`**: This method first uses `toPrecision(4)` to round the number to a specified precision (in this case, 4 digits), and then converts the result into a string using `toString()`.
* **`(Math.round(someFloat * 10000) / 10000).toString()`**: This method multiplies the number by 10000, rounds the result using `Math.round`, divides it back by 10000, and finally converts it to a string.

**Pros and Cons:**

* **`toFixed(4)`**: 
    * **Pros:** Simple and easy to understand. Widely used for formatting numbers with a fixed number of decimal places.
    * **Cons:** May not always provide the most accurate rounding depending on the specific value. Can be slightly slower than other methods.
* **`toPrecision(4).toString()`**: 
    * **Pros:** More flexible in controlling the precision of the rounded number.  Can handle cases where the number has a varying number of significant digits.
    * **Cons:** Slightly more complex to read and write compared to `toFixed`.
* **`(Math.round(*10000) / 10000).toString()`**: 
    * **Pros:** Can be very accurate for rounding to a specific number of decimal places.  
    * **Cons:** More verbose and potentially harder to understand compared to the other methods.

**Other Considerations:**

* **Performance**: The benchmark results show that `toFixed(4)` is generally the fastest method in this case, followed by `toPrecision(4).toString()`, and then `(Math.round(*10000) / 10000).toString()`. However, performance can vary depending on the specific value being rounded and the JavaScript engine being used.

**Alternatives:**
  * **Libraries**: Libraries like Lodash or Underscore offer utility functions for rounding numbers that may be more efficient or provide additional features.

Let me know if you have any other questions!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0

Browser/OS: Firefox 118 on Windows

View result in a separate tab

Test name	Executions per second
toFixed(4)	21916862.0 Ops/sec
toPrecision(4).toString()	15628011.0 Ops/sec
(Math.round(*10000)/10000).toString()	1713118976.0 Ops/sec

Related benchmarks:

toFixed vs toPrecision vs Math.round() with num > 0 (version: 0)

Comparing performance of: toFixed(4) vs toPrecision(4).toString() vs (Math.round(*10000)/10000).toString()

Created: one year ago by: Guest

Jump to the latest result

toFixed(4)

toPrecision(4).toString()

(Math.round(*10000)/10000).toString()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 27 days ago):