Benchmark: 444444444444444444

Script Preparation code:

var someFloat = 0.123456789;

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

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 benchmark and its test cases.

**What is being tested?**

The benchmark measures the performance of different JavaScript operations on floating-point numbers. The specific tests are:

1. `+someFloat.toFixed(4);` - This operation rounds a float to 4 decimal places using the `toFixed()` method.
2. `(Math.round(someFloat*10000)/10000);` - This operation rounds a float to an integer by first multiplying it by 10,000, rounding to the nearest integer using `Math.round()`, and then dividing by 10,000.
3. `~~(someFloat * 10000) / 10000;` - This operation also rounds a float to an integer, but uses the bitwise NOT operator (`~~`) instead of `Math.round()`.

**Options compared**

The benchmark compares three different approaches:

1. **`toFixed(4)`**: Rounds a float to 4 decimal places using the `toFixed()` method.
	* Pros: Simple and straightforward way to round floats.
	* Cons: May be slower due to the overhead of calling a method, and may not be as efficient for very large numbers.
2. **`Math.round()`**: Rounds a float to an integer by rounding towards zero.
	* Pros: Faster than `toFixed(4)` because it doesn't involve a function call.
	* Cons: May produce incorrect results if the number is not exactly halfway between two integers.
3. **Bitwise NOT operator (`~~`)**: Rounds a float to an integer by performing a bitwise NOT operation on the product of the number and 10,000.
	* Pros: Very fast because it's a simple bitwise operation.
	* Cons: May be less readable than other approaches, and may produce incorrect results if not implemented carefully.

**Library**

None of these tests use any external libraries beyond what's included in JavaScript (e.g., `Math`).

**Special JS features**

The only special feature used here is the bitwise NOT operator (`~~`). This operator performs a bitwise NOT operation on its operand, which is equivalent to multiplying it by -1 and then converting it to an integer.

**Benchmark preparation code**

The benchmark preparation code simply defines a variable `someFloat` with value 0.123456789.

**Other alternatives**

If the tests were modified to use other rounding algorithms or methods, some alternative approaches could be:

* Using a custom rounding function
* Implementing a specialized rounding algorithm (e.g., "banker's rounding" for financial applications)
* Using a library like ` Decimal.js` that provides a more precise and robust way of working with floating-point numbers.

However, it's worth noting that the specific tests and options being compared are likely intended to highlight the performance differences between these three approaches.

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/116.0

Browser/OS: Firefox 116 on Windows

View result in a separate tab

Test name	Executions per second
+someFloat.toFixed(4);	14901734.0 Ops/sec
(Math.round(someFloat*10000)/10000);	1662973440.0 Ops/sec
~~(someFloat * 10000) / 10000;	1559779072.0 Ops/sec

Related benchmarks:

444444444444444444 (version: 0)

Comparing performance of: +someFloat.toFixed(4); vs (Math.round(someFloat10000)/10000); vs ~~(someFloat 10000) / 10000;

Created: one year ago by: Guest

Jump to the latest result

+someFloat.toFixed(4);

(Math.round(someFloat*10000)/10000);

~~(someFloat * 10000) / 10000;

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):

444444444444444444 (version: 0)

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

Created: one year ago by: Guest

Jump to the latest result

+someFloat.toFixed(4);

(Math.round(someFloat*10000)/10000);

~~(someFloat * 10000) / 10000;

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):

Comparing performance of: +someFloat.toFixed(4); vs (Math.round(someFloat10000)/10000); vs ~~(someFloat 10000) / 10000;