Benchmark: fixed vs math - MeasureThat.net

Script Preparation code:

var roundFixed = (value, precision = 2) => +((+value).toFixed(precision));
var roundMath = (value, precision = 2) => {
	const rounder = 10 ** precision;
	return Math.round((+value) * rounder) / rounder;
};

var gross = '999999.99';
var discount = '15';

Tests:

fixed
const sum = roundFixed(roundFixed(gross) * roundFixed(discount) / 100);
math
const sum = roundMath(roundMath(gross) * roundMath(discount) / 100);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fixed
math

Fastest: N/A

Slowest: N/A

Latest run results:

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

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**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark that compares two approaches for rounding numbers: the `fixed` method using `toFixed()` and the `math` method using multiplication by 10 raised to precision.

**Options Compared**

The benchmark tests two options:

1. **Fixed Method**: This approach uses the `toFixed()` function to round numbers to a specific number of decimal places (defaulting to 2 if not specified).
	* Pros:
		+ Simple and widely supported in most browsers.
		+ Can be easily implemented using a single method call.
	* Cons:
		+ May lead to slower performance due to the overhead of string manipulation and parsing.
2. **Math Method**: This approach uses multiplication by 10 raised to precision to round numbers, which is similar to the `round()` function in Math.js (a JavaScript library).
	* Pros:
		+ Can be faster than the fixed method, as it avoids string manipulation and parsing overhead.
	* Cons:
		+ Requires a library like Math.js to implement, which may not be included in all browsers.

**Library Used:**

In this benchmark, the `Math.js` library is used for the math method. `Math.js` provides an implementation of various mathematical functions, including `round()`, that can be used in JavaScript code.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes mentioned in the provided JSON. The code only uses standard JavaScript syntax and libraries like Math.js.

**Other Alternatives:**

If you wanted to implement a different rounding approach, here are some alternatives:

1. **Rounding to significant figures**: Instead of using `toFixed()` or multiplication by 10 raised to precision, you could use a library like [scientific](https://github.com/mozilla/scientific) to round numbers to significant figures.
2. **Using a rounding function in a library**: You could also explore other libraries like [Big.js](https://github.com/jedahan/Big.js) or [Decimal.js](https://github.com/MikeMoxon/Decimal.js) that provide rounding functions and might offer better performance.

**Benchmark Preparation Code Explanation**

The provided `Script Preparation Code` section defines two rounding functions:

* `roundFixed`: takes a value and an optional precision parameter, rounds the value to the specified number of decimal places using `toFixed()`, and returns the result as a number.
* `roundMath`: takes a value and an optional precision parameter, calculates the multiplier for rounding (10 raised to precision), multiplies the value by this multiplier, rounds the result to the nearest integer using Math.round(), and divides by the multiplier to get the final rounded value.

The `gross` and `discount` variables are set to specific values (`'999999.99'` and `'15'`, respectively) for use in the benchmark tests.

Related benchmarks:

fixed vs math (version: 0)

Comparing performance of: fixed vs math

Created: 3 years ago by: Guest

Jump to the latest result

fixed

math

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):