Benchmark: toFixed vs math - MeasureThat.net

Script Preparation code:

var x = 0.123456

Tests:

toFixed
+x.toFixed(2)
trunc
Math.trunc(x * 100) / 100

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toFixed
trunc

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The test compares two approaches to format a floating-point number: using the `toFixed()` method or calculating the truncated value manually. The goal is to determine which approach is faster in JavaScript.

**Options Compared**

There are two options being compared:

1. **`toFixed(2)`**: This uses the `toFixed()` method to round the float to 2 decimal places. The number of decimal places can affect performance.
2. **`Math.trunc(x * 100) / 100`**: This manually calculates the truncated value by multiplying the float by 100, truncating the result using `Math.trunc()`, and then dividing by 100.

**Pros and Cons**

* **`toFixed(2)`**:
	+ Pros: Easy to implement and maintain. The method is widely supported and provides a clear understanding of the desired output.
	+ Cons: May incur overhead due to the rounding process, which can lead to slower performance compared to manual calculations.
* **`Math.trunc(x * 100) / 100`**:
	+ Pros: Can be faster than `toFixed()` since it avoids the rounding process. This approach relies on understanding how floating-point numbers are represented in binary.
	+ Cons: More complex and may require more careful implementation to ensure accurate results.

**Library**

The benchmark uses none, but if we consider the `Math` library, its purpose is to provide mathematical functions for performing operations like exponentiation, logarithms, trigonometry, and so on. In this case, `Math.trunc()` is used to truncate a number.

**Special JS Feature/Syntax**

There's no special JavaScript feature or syntax being tested in this benchmark. It only focuses on the performance comparison between two different approaches.

**Alternative Approaches**

Other possible alternatives for formatting floating-point numbers include:

* Using scientific notation (e.g., `x.toExponential()`)
* Using a third-party library like jQuery or Moment.js
* Implementing custom rounding logic using bitwise operations

However, these alternatives are not being tested in this benchmark.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_8_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 14 on iOS 14.8.1

View result in a separate tab

Test name	Executions per second
toFixed	1276783.6 Ops/sec
trunc	1046612.4 Ops/sec

Related benchmarks:

toFixed vs math (version: 0)

Comparing performance of: toFixed vs trunc

Created: 2 years ago by: Guest

Jump to the latest result

toFixed

trunc

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):