Benchmark: lodash.round VS toFixed() VS toFixed() and Number

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++) { Number(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

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 dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark is designed to compare three approaches for rounding a floating-point number: `lodash.round`, `toFixed()`, and `toFixed()` followed by `parseFloat`. The goal is to determine which approach is the most efficient.

**Options Compared**

* `lodash.round`: A function from the Lodash library that rounds a number to a specified decimal place.
* `toFixed(2)`: A JavaScript method that formats a number as a fixed-point string with a specified number of decimals.
* `toFixed(2) + parseFloat()`: Combining `toFixed(2)` with `parseFloat()` to achieve similar rounding behavior.

**Pros and Cons**

1. **_lodash.round_**:
	* Pros: Simple, well-documented, and widely used library.
	* Cons: Adds an extra dependency to the benchmark (Lodash), which might affect performance in certain scenarios.
2. **`toFixed(2)`**:
	* Pros: Lightweight, built-in method, and easy to understand.
	* Cons: May have precision issues for certain input values or edge cases.
3. **`toFixed(2) + parseFloat()`**:
	* Pros: Similar to `lodash.round`, but avoids the dependency on Lodash.
	* Cons: Still requires concatenation and parsing, which can be overhead.

**Library - _lodash_**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, object transformation, and more. In this benchmark, `_lodash.round()` is used to round floating-point numbers.

**Special JS Feature/Syntax - `toFixed()`**

`toFixed(2)` uses the ECMAScript 5 (ES5) method for formatting numbers as fixed-point strings. This syntax is widely supported across modern browsers and JavaScript engines.

**Other Alternatives**

If you're looking for alternative rounding methods, consider:

* Using a library like Moment.js for date-based calculations.
* Implementing custom rounding logic using bitwise operations or mathematical formulas.
* Leveraging browser-specific features like `Number.EPSILON` (approximately 5e-324) to determine the smallest representable floating-point value.

When choosing an approach, weigh factors like performance, precision, and maintainability. In this benchmark, `toFixed(2)` emerges as a lightweight and straightforward solution, while `_lodash.round()` offers more robustness and flexibility. The combined approach of `toFixed(2)` + `parseFloat()` strikes a balance between these considerations.

Related benchmarks:

lodash.round VS toFixed() VS toFixed() and Number (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: 3 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>

Fastest: N/A

Slowest: N/A

No previous run results

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