Benchmark: toFixed vs mathjs round

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/mathjs/10.0.0/math.min.js'></script>

Script Preparation code:

var num = -6.864601706668172e-10

function round2(num, decimalPlaces = 0) {
    // return Math.round(value * (10 ** decimals)) / (10 ** decimals);
    // return Number(value.toFixed(decimals));
    if (num < 0) {
        return -round2(-num, decimalPlaces);
    }
    var p = Math.pow(10, decimalPlaces);
    var n = num * p;
    var f = n - Math.floor(n);
    var e = Number.EPSILON * n;

    // Determine whether this fraction is a midpoint value.
    return (f >= .5 - e) ? Math.ceil(n) / p : Math.floor(n) / p;
}

Tests:

toFixed
parseFloat(num.toFixed(8))
mathjs.round
math.round(num, 8)
round2
round2(num, 8)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toFixed
mathjs.round
round2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Linux

View result in a separate tab

Test name	Executions per second
toFixed	15348779.0 Ops/sec
mathjs.round	1021792.2 Ops/sec
round2	55342768.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the provided benchmark.

**Benchmark Definition**

The benchmark is comparing three functions for rounding numbers:

1. `toFixed`: This function rounds a number to a specified decimal place using the built-in `toFixed` method of JavaScript numbers.
2. `mathjs.round`: This function uses the Math.js library, which provides a set of mathematical functions, including rounding functions like `round`.
3. `round2`: This is a custom implementation provided in the script preparation code. It's designed to be more precise than `toFixed` and `mathjs.round`, but also more complex.

**Options Compared**

The benchmark compares the performance of these three functions for the following tasks:

* `parseFloat(num.toFixed(8))`
* `math.round(num, 8)`
* `round2(num, 8)`

These tasks involve rounding the number `-6.864601706668172e-10` to 8 decimal places.

**Pros and Cons**

Here's a brief summary of the pros and cons of each function:

1. **toFixed**: This is the most straightforward way to round numbers in JavaScript. It's widely supported and easy to use, but it may not be as precise as other methods.
	* Pros: Easy to implement, widely supported
	* Cons: May lose precision for very small or very large numbers
2. **mathjs.round**: This function uses the Math.js library, which provides a more robust rounding algorithm. However, it requires an external library and may not be available in all environments.
	* Pros: More precise than `toFixed`, supports more decimal places
	* Cons: Requires an external library, may not work in older browsers or environments
3. **round2**: This custom implementation is designed to be more precise than `toFixed` and `mathjs.round`. However, it's also more complex and may require more computational resources.
	* Pros: Highly precise, flexible implementation
	* Cons: More complex, requires more computational resources

**Library: Math.js**

Math.js is a lightweight JavaScript library that provides a set of mathematical functions, including rounding functions like `round`. The library aims to provide a more robust and accurate alternative to the built-in JavaScript methods.

**Special JS Feature or Syntax**

There doesn't appear to be any special JavaScript features or syntax being used in this benchmark. However, it's worth noting that some browsers may have specific optimizations or limitations when using certain functions or libraries.

**Other Alternatives**

If you're looking for alternative ways to round numbers in JavaScript, here are a few options:

1. **BigInt**: For very large and precise number calculations, consider using the `BigInt` data type, which provides support for arbitrary-precision arithmetic.
2. **Decimal.js**: This library provides a more precise and flexible way to work with decimal numbers, similar to Math.js but with additional features.
3. **External libraries**: Depending on your specific use case, you may find alternative libraries or solutions that provide the precision and functionality you need.

Keep in mind that each of these alternatives has its own trade-offs and requirements, so be sure to evaluate them carefully before choosing a solution.

Related benchmarks:

toFixed vs mathjs round (version: 3)

Comparing performance of: toFixed vs mathjs.round vs round2

Created: 3 years ago by: Registered User

Jump to the latest result

toFixed

mathjs.round

round2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):