Benchmark: toFixed vs toPrecision vs Math.round() vs Math.floorfast 2

Script Preparation code:

var someFloat = 0.123456789;

Tests:

toFixed(4)
someFloat.toFixed(4);
toPrecision(4).toString()
someFloat.toPrecision(4);
(Math.round(*10000)/10000).toString()
(Math.round(someFloat*10000)/10000);
Math.floor fast
~~(someFloat * Number(`1${'0'.repeat(4)}`)) / Number(`1${'0'.repeat(4)}`);

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()
Math.floor fast

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

The provided JSON represents a JavaScript microbenchmarking test case on the MeasureThat.net website. The benchmark measures the performance of four different methods for rounding or formatting floating-point numbers: `toFixed`, `toPrecision`, `Math.round()`, and `Math.floorfast` (also known as "fast math" mode).

**Options being compared:**

1. **`toFixed(4)`**: This method formats a number to have a specified number of decimal places.
2. **`toPrecision(4).toString()`**: This method is equivalent to `toFixed(4)`, but it also returns the string representation of the result, which may incur additional overhead.
3. **`(Math.round(someFloat*10000)/10000).toString()`**: This method uses a roundabout approach to achieve rounding by multiplying the number by 10,000, rounding using `Math.round()`, and then dividing by 10,000. It returns the string representation of the result.
4. **`Math.floorfast someFloat`**: This method uses "fast math" mode to perform floating-point operations, which can be faster than regular `Math.floor()` but is not guaranteed to produce the same results.

**Pros and cons of each approach:**

1. **`toFixed(4)`**:
	* Pros: Simple, efficient, and accurate.
	* Cons: May not work well with very large or very small numbers due to rounding errors.
2. **`toPrecision(4).toString()`**:
	* Pros: Similar to `toFixed(4)`, but returns the string representation of the result, which may be useful in certain contexts.
	* Cons: Involves additional overhead due to string conversion and potentially slower performance.
3. **`(Math.round(someFloat*10000)/10000).toString()`**:
	* Pros: Avoids using `toFixed()` or `toPrecision()`, which can be slower, but the roundabout approach may incur additional overhead due to unnecessary multiplications.
	* Cons: Less intuitive and less efficient than other approaches.
4. **`Math.floorfast someFloat`**:
	* Pros: Can be faster than regular `Math.floor()` for floating-point operations, especially for large numbers.
	* Cons: Not guaranteed to produce the same results as regular `Math.floor()`, which can lead to rounding errors.

**Library used:** None explicitly mentioned in the provided JSON. However, it is likely that MeasureThat.net uses a JavaScript engine or runtime environment that provides these functions and other necessary libraries for running benchmarks.

No special JavaScript features or syntax are being tested in this benchmark.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Windows

View result in a separate tab

Test name	Executions per second
toFixed(4)	5574795.0 Ops/sec
toPrecision(4).toString()	6457803.0 Ops/sec
(Math.round(*10000)/10000).toString()	7262399.5 Ops/sec
Math.floor fast	2922768.0 Ops/sec

Related benchmarks:

toFixed vs toPrecision vs Math.round() vs Math.floorfast 2 (version: 0)

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

Created: 4 years ago by: Guest

Jump to the latest result

toFixed(4)

toPrecision(4).toString()

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

Math.floor fast

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):