Benchmark: toFixed vs toPrecision vs Math.round() - value devided by 10

Script Preparation code:

var someFloat = 0.123456789;

Tests:

divided by 10 toFixed(1)
(someFloat/10).toFixed(1);
divided by 10 toPrecision(1).toString()
(someFloat/10).toPrecision(1).toString();
divided by 10 (Math.round(*10000)/10000).toString()
(Math.round((someFloat/10)*10)/10).toString();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
divided by 10 toFixed(1)
divided by 10 toPrecision(1).toString()
divided by 10 (Math.round(*10000)/10000).toString()

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark is to compare three different approaches to format a floating-point number:

1. `toFixed(1)`
2. `toPrecision(1).toString()`
3. `(Math.round((someFloat/10)*10)/10).toString()` (which involves an intermediate multiplication and rounding)

The test uses a sample float value `someFloat` initialized as 0.123456789.

**Options Compared**

* `toFixed(1)`: Formats the number to have one decimal place.
* `toPrecision(1).toString()`: Formats the number to have one decimal place, using the `toPrecision()` method which allows for more control over the format.
* `(Math.round((someFloat/10)*10)/10).toString()`: Rounds the result of dividing `someFloat` by 10 and then rounds again (after multiplying by 10) to get an integer number with a limited precision.

**Pros and Cons**

1. **toFixed(1)**:
	* Pros: Simple, straightforward, and widely supported.
	* Cons: May not work well for large or small numbers, as it uses a fixed number of decimal places.
2. **toPrecision(1).toString()**:
	* Pros: More control over the format, handles large/small numbers better.
	* Cons: Requires more operations, potentially slower than `toFixed(1)`.
3. **(Math.round((someFloat/10)*10)/10).toString()**:
	* Pros: Provides a fixed precision (in this case, 2 decimal places), which might be desirable for certain use cases.
	* Cons: Involves additional operations, potentially slower than `toFixed(1)`.

**Library**

None of the test cases explicitly use a library. However, `toPrecision()` is a built-in method in JavaScript.

**Special JS Feature or Syntax**

There are no special features or syntax used in this benchmark definition that would require advanced knowledge.

**Other Alternatives**

Some alternative approaches to formatting floating-point numbers might include:

* Using a format string with `%f` (e.g., `printf("%f", someFloat)`).
* Using a library like Moment.js for date and number formatting.
* Using a different rounding algorithm, such as banker's rounding or round-half-to-even.

However, these alternatives are not part of the original benchmark definition.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.58 Safari/537.36

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
divided by 10 toFixed(1)	2679251.5 Ops/sec
divided by 10 toPrecision(1).toString()	2738772.0 Ops/sec
divided by 10 (Math.round(*10000)/10000).toString()	2526912.0 Ops/sec

Related benchmarks:

toFixed vs toPrecision vs Math.round() - value devided by 10 (version: 0)

Comparing performance of: divided by 10 toFixed(1) vs divided by 10 toPrecision(1).toString() vs divided by 10 (Math.round(*10000)/10000).toString()

Created: 3 years ago by: Guest

Jump to the latest result

divided by 10 toFixed(1)

divided by 10 toPrecision(1).toString()

divided by 10 (Math.round(*10000)/10000).toString()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):