Benchmark: lodash.round VS toFixed() VS parseFloat().toFixed()

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var x = 5.236;

Tests:

Round floating number using lodash round function
for (var i = 0; i < 1000; i++) { _.round(x,2); }
Round floating number using toFixed()
for (var i = 0; i < 1000; i++) { x.toFixed(2); }
Round floating number using toFixed() and parseFloat
for (var i = 0; i < 1000; i++) { parseFloat(x).toFixed(2); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Round floating number using lodash round function
Round floating number using toFixed()
Round floating number using toFixed() and parseFloat

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark compares three different approaches to rounding a floating-point number:

1. `lodash.round` (using the Lodash library)
2. `toFixed()` (JavaScript native function)
3. `parseFloat().toFixed()` (combination of two functions)

**Options Compared**

The options compared are:

* `lodash.round(x, 2)`: rounds the input `x` to 2 decimal places using the Lodash library.
* `x.toFixed(2)`: rounds the input `x` to 2 decimal places using JavaScript's `toFixed()` function.
* `parseFloat(x).toFixed(2)`: first converts `x` to a floating-point number using `parseFloat()`, and then rounds it to 2 decimal places using `toFixed()`.

**Pros and Cons of Each Approach**

1. **Lodash `round()`**: This approach is specific to the Lodash library, which means it requires an additional dependency. However, it provides a more explicit and controlled rounding process.
	* Pros: easy to use, flexible rounding options.
	* Cons: adds extra library dependency, may not be familiar to all developers.
2. **`toFixed()`**: This approach is part of the JavaScript standard library and is widely supported. It's also very concise and easy to read.
	* Pros: lightweight, widely supported, easy to use.
	* Cons: can lead to unexpected behavior if not used carefully (e.g., with negative numbers or non-numeric inputs).
3. **`parseFloat().toFixed()`**: This approach combines the benefits of both `toFixed()` and `parseFloat()`. However, it's slightly more verbose than using just `toFixed()`.
	* Pros: provides a safety net for handling invalid inputs.
	* Cons: requires two function calls, which can be slower.

**Library and Purpose**

The Lodash library is a popular JavaScript utility library that provides various functions for tasks such as string manipulation, array manipulation, and more. The `round()` function in particular is designed to round numbers to a specified decimal place, making it a convenient option for this benchmark.

**Special JS Features or Syntax**

There are no special JS features or syntax used in this benchmark. However, it's worth noting that the use of `var` instead of `let` or `const` is not modern JavaScript practice and can lead to issues with variable scope and hoisting.

**Other Alternatives**

For rounding floating-point numbers in JavaScript, other alternatives include:

* Using the `Math.round()` function, which rounds to the nearest integer.
* Using a library like Decimal.js, which provides precise decimal arithmetic.
* Implementing your own rounding algorithm using bitwise operations or other techniques.

Keep in mind that the choice of rounding approach depends on the specific requirements and constraints of your project.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36 Edg/80.0.361.69

Browser/OS: Chrome 80 on Windows

View result in a separate tab

Test name	Executions per second
Round floating number using lodash round function	392.8 Ops/sec
Round floating number using toFixed()	1628.3 Ops/sec
Round floating number using toFixed() and parseFloat	1047.6 Ops/sec

Related benchmarks:

lodash.round VS toFixed() VS parseFloat().toFixed() (version: 0)

Compare round lodash function vs javascript native toFixed() function

Comparing performance of: Round floating number using lodash round function vs Round floating number using toFixed() vs Round floating number using toFixed() and parseFloat

Created: 4 years ago by: Guest

Jump to the latest result

Round floating number using lodash round function

Round floating number using toFixed()

Round floating number using toFixed() and parseFloat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):