Benchmark: test rounding - MeasureThat.net

Script Preparation code:

var someFloat = 0.123456789;

Tests:

someFloat.toFixed(4);
someFloat.toFixed(4);
someFloat.toPrecision(4).toString();
someFloat.toPrecision(4).toString();
(Math.round(someFloat*10000)/10000).toString();
(Math.round(someFloat*10000)*0.00001).toString();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmarking test case on the MeasureThat.net website. The benchmark tests how different browsers and platforms perform when rounding numbers to a specific precision.

In this test, the script `someFloat` is initialized with a floating-point value of 0.123456789. Then, three different approaches are compared:

1. **toFixed(4)**: This method rounds the number to 4 decimal places.
2. **toPrecision(4).toString()**: This method uses the `toPrecision()` method to specify the desired precision (in this case, 4) and then converts the result to a string using the `toString()` method.

**Options being compared**

The test compares the execution times of these two approaches in different browsers and platforms:

* **Opera 93**
* **Windows Desktop**

**Pros and Cons of each approach:**

1. **toFixed(4)**:
	* Pros: Simple, widely supported, and easy to read.
	* Cons: May not be as precise as other methods, especially for larger numbers.
2. **toPrecision(4).toString()**:
	* Pros: More precise than `toFixed()` and can handle larger numbers.
	* Cons: May be less readable due to the use of multiple methods and conversions.

**Library and its purpose**

In this test case, none of the libraries are explicitly mentioned. However, it's worth noting that some browsers may have built-in rounding functions or methods that could potentially affect the performance of these tests.

**Special JS features or syntax**

The test uses the `Math.round()` function to round the number, which is a JavaScript function for rounding numbers to the nearest integer.

However, in this specific benchmark, it's not the `Math.round()` function itself that's being tested, but rather its usage within an expression. The actual implementation of `toPrecision()` and `toFixed()` is provided by the JavaScript engine used by each browser, which may have some variations in behavior or optimization.

**Other alternatives**

To test alternative rounding methods, you could consider adding more benchmark definitions, such as:

* Using a different number format (e.g., scientific notation)
* Testing rounding errors for negative numbers
* Comparing performance of other libraries or frameworks that provide rounding functions

For example:
```json
[
    {
        "Benchmark Definition": "(someFloat.toFixed(4) * -1).toString();",
        "Test Name": "(someFloat.toFixed(4) * -1).toString();"
    },
    {
        "Benchmark Definition": "Number(someFloat.toPrecision(4)).toFixed(4);",
        "Test Name": "Number(someFloat.toPrecision(4)).toFixed(4);"
    }
]
```
These additions would allow you to explore different scenarios and gain a deeper understanding of the performance characteristics of each rounding method.

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/107.0.0.0 Safari/537.36 OPR/93.0.0.0

Browser/OS: Opera 93 on Windows

View result in a separate tab

Test name	Executions per second
someFloat.toFixed(4);	6070845.5 Ops/sec
someFloat.toPrecision(4).toString();	6761235.5 Ops/sec
(Math.round(someFloat*10000)/10000).toString();	6511857.0 Ops/sec

Related benchmarks:

test rounding (version: 0)

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

Created: one year ago by: Guest

Jump to the latest result

someFloat.toFixed(4);

someFloat.toPrecision(4).toString();

(Math.round(someFloat*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 one month ago):