Benchmark: To fixed vs round vs to precision with float result

Script Preparation code:

var someFloat = 0.123456789;

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark measures the performance of three different approaches to round or convert floating-point numbers in JavaScript:

1. `toFixed()` with a fixed precision (4 decimal places)
2. `toPrecision()` with a specified precision (4 decimal places)
3. `Math.round()` followed by division by 10,000

**Options Compared**

The benchmark compares the performance of these three approaches on a single floating-point number (`someFloat`) with a value of 0.123456789.

* **`toFixed(4)`**: Rounds the number to 4 decimal places using the `toFixed()` method.
* **`toPrecision(4)`**: Converts the number to a string with a specified precision (4 decimal places) using the `toPrecision()` method.
* **`Math.round(someFloat * 10000) / 10000`**: Rounds the number by multiplying it by 10,000, rounding to the nearest integer, and then dividing by 10,000.

**Pros and Cons of Each Approach**

1. **`toFixed(4)`**:
	* Pros: Simple and straightforward implementation.
	* Cons: May lead to precision issues if the input value is not a simple decimal.
2. **`toPrecision(4)`**:
	* Pros: More precise than `toFixed()` since it converts the number to a string with a specified precision.
	* Cons: May be slower than `toFixed()` due to the string conversion step.
3. **`Math.round(someFloat * 10000) / 10000`**:
	* Pros: Avoids potential precision issues with decimal representation and provides better rounding control.
	* Cons: More complex implementation that may introduce additional overhead.

**Library Used**

None explicitly mentioned in the benchmark definition. However, if a JavaScript library is used in the test code, it would be included in the benchmark results.

**Special JS Feature or Syntax**

No special features or syntax are used in this benchmark.

**Other Alternatives**

Other alternatives to these approaches could include:

* Using `Number.EPSILON` to determine the smallest representable float value for a given precision.
* Utilizing a more advanced rounding algorithm, such as the "banker's rounding" approach.
* Employing a custom implementation using bitwise operations or other low-level techniques.

Keep in mind that these alternatives might not be relevant or applicable in this specific benchmark scenario.

Related benchmarks:

To fixed vs round vs to precision with float result (version: 0)

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

Created: 5 years ago by: Guest

Jump to the latest result

parseFloat(someFloat.toFixed(4));

parseFloat(someFloat.toPrecision(4))

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

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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