Benchmark: toFixed vs toPrecision vs Round without Stringify v2

Script Preparation code:

var someFloat = 0.123456789;

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark definition is represented by a JSON object with three key properties:

* `Name`: A descriptive name for the benchmark, which in this case is "toFixed vs toPrecision vs Round without Stringify v2".
* `Description`: An optional description of the benchmark, but it's null in this case.
* `Script Preparation Code` and `Html Preparation Code`: These are code snippets that prepare the environment for the benchmark. In this case, the script preparation code is setting a variable `someFloat` to a float value using `var someFloat = 0.123456789;`.

**Test Cases**

The test cases are individual JavaScript expressions that are being compared. There are three test cases:

1. `someFloat.toPrecision(4);`
2. `Math.round(someFloat*10000)/10000;` (using string concatenation)
3. `someFloat.toFixed(4);`

These test cases compare the performance of different methods to round or format a float value: `toPrecision`, `Math.round` with multiplication and division, and `toFixed`.

**Library**

The `toPrecision` method is part of the JavaScript built-in functions, which is why it doesn't require any external libraries.

**Special JS Feature/Syntax**

None mentioned in this benchmark.

Now, let's discuss the pros and cons of each approach:

1. **`someFloat.toPrecision(4);`**: This method is more efficient because it uses a binary search algorithm to find the correct precision level. However, it may not be as readable or intuitive for developers who are not familiar with this method.
2. **`Math.round(someFloat*10000)/10000;` (using string concatenation)**: This approach is less efficient because it involves multiplication and division operations, which can lead to overflow errors for large values. Additionally, the use of string concatenation makes the code harder to read and maintain.
3. **`someFloat.toFixed(4);`**: This method is more readable than `toPrecision`, but it may be slower due to the overhead of formatting a string.

**Other Alternatives**

If you need alternative methods for rounding or formatting numbers, here are some other options:

* For `rounding`:
	+ `Number rounds Float (e.g., Math.ceil, Math.floor)`
	+ `Decimal.js` library (not part of the standard JavaScript)
* For `formatting`:
	+ `toLocaleString()` method (part of the standard JavaScript)
	+ `Intl.NumberFormat` API (part of the standard JavaScript)

Keep in mind that these alternatives may have different performance characteristics, trade-offs between readability and maintainability, or additional dependencies.

**Benchmark Results**

The benchmark results are provided in a JSON format. The data points include:

* `RawUAString`: A string representation of the user agent making the request.
* `Browser`, `DevicePlatform`, `OperatingSystem`: Information about the browser, device, and operating system that made the request.
* `ExecutionsPerSecond`: The number of executions per second.

These results can help developers compare the performance of different approaches in various browsers, devices, and environments.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0

Browser/OS: Firefox 100 on Ubuntu

View result in a separate tab

Test name	Executions per second
someFloat.toPrecision(4)	13675688.0 Ops/sec
(Math.round(someFloat*10000)/10000	1547985280.0 Ops/sec
someFloat.toFixed(4);	15741206.0 Ops/sec

Related benchmarks:

toFixed vs toPrecision vs Round without Stringify v2 (version: 0)

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

Created: 2 years ago by: Guest

Jump to the latest result

someFloat.toPrecision(4)

(Math.round(someFloat*10000)/10000

someFloat.toFixed(4);

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):