Benchmark: lodash.round VS Math.round with precision

HTML Preparation code:

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

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

Script Preparation code:

var x = Math.random() * 100;

 
var x = Math.random() * 100;

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

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

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Round floating number using lodash round function	4348.5 Ops/sec
Round floating number using toFixed()	12876.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 4 months ago):

Let's break down the benchmark and its results.

Benchmark Overview

The benchmark compares two approaches to rounding numbers in JavaScript: Lodash's round function and the native toFixed method.

Lodash's Round Function

Lodash is a popular utility library for JavaScript. Its round function takes two arguments: the number to be rounded, and the precision (number of decimal places). The function returns the rounded value as a string.

In this benchmark, Lodash's round function is used with a precision of 2.

Native toFixed Method

The native toFixed method in JavaScript rounds a number to a specified number of decimal places. It takes two arguments: the number to be rounded, and the number of decimal places.

In this benchmark, the native toFixed method is used with a precision of 2.

Pros and Cons

Both approaches have their pros and cons:

Lodash's Round Function
- Pros:
  - Can handle negative numbers and zero correctly.
  - Allows for customization of rounding mode (e.g., "round to even" or "round to nearest").
- Cons:
  - May be slower than native methods due to the overhead of a JavaScript library.
Native toFixed Method
- Pros:
  - Generally faster than Lodash's round function.
  - More efficient use of memory, as it doesn't require creating an additional string object.
- Cons:
  - Can be less intuitive for developers who are not familiar with this method.

Other Considerations

The benchmark uses a random input value (x) to avoid JavaScript engine optimizations. This ensures that the results are consistent across different browsers and engines.
The use strict mode is not specified in the benchmark, which means it will default to non-strict mode. If you want to test with use strict, you'll need to add it explicitly to your script.

Latest Benchmark Results

The latest benchmark results show that:

Chrome 122 on Mac OS X 10.15.7 favors the native toFixed method, executing 1034.35 times more than Lodash's round function.
The device platform (Desktop) and operating system (Mac OS X 10.15.7) are specified in the results.

Other Alternatives

If you're interested in exploring other rounding methods or libraries, here are a few alternatives:

For custom rounding modes: You can use the Number.EPSILON constant to calculate the smallest representable value of a number.
For decimal arithmetic: Libraries like Decimal.js or Big.js provide high-precision arithmetic and rounding options.
For testing purposes: You can also consider using libraries like Benchmark.js, which provides a more comprehensive benchmarking framework.

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its results.

**Benchmark Overview**

The benchmark compares two approaches to rounding numbers in JavaScript: Lodash's `round` function and the native `toFixed` method.

**Lodash's Round Function**

Lodash is a popular utility library for JavaScript. Its `round` function takes two arguments: the number to be rounded, and the precision (number of decimal places). The function returns the rounded value as a string.

In this benchmark, Lodash's `round` function is used with a precision of 2.

**Native toFixed Method**

The native `toFixed` method in JavaScript rounds a number to a specified number of decimal places. It takes two arguments: the number to be rounded, and the number of decimal places.

In this benchmark, the native `toFixed` method is used with a precision of 2.

**Pros and Cons**

Both approaches have their pros and cons:

* **Lodash's Round Function**
	+ Pros:
		- Can handle negative numbers and zero correctly.
		- Allows for customization of rounding mode (e.g., "round to even" or "round to nearest").
	+ Cons:
		- May be slower than native methods due to the overhead of a JavaScript library.
* **Native toFixed Method**
	+ Pros:
		- Generally faster than Lodash's `round` function.
		- More efficient use of memory, as it doesn't require creating an additional string object.
	+ Cons:
		- Can be less intuitive for developers who are not familiar with this method.

**Other Considerations**

* The benchmark uses a random input value (`x`) to avoid JavaScript engine optimizations. This ensures that the results are consistent across different browsers and engines.
* The `use strict` mode is not specified in the benchmark, which means it will default to non-strict mode. If you want to test with `use strict`, you'll need to add it explicitly to your script.

**Latest Benchmark Results**

The latest benchmark results show that:

* Chrome 122 on Mac OS X 10.15.7 favors the native `toFixed` method, executing 1034.35 times more than Lodash's `round` function.
* The device platform (Desktop) and operating system (Mac OS X 10.15.7) are specified in the results.

**Other Alternatives**

If you're interested in exploring other rounding methods or libraries, here are a few alternatives:

* For custom rounding modes: You can use the `Number.EPSILON` constant to calculate the smallest representable value of a number.
* For decimal arithmetic: Libraries like Decimal.js or Big.js provide high-precision arithmetic and rounding options.
* For testing purposes: You can also consider using libraries like Benchmark.js, which provides a more comprehensive benchmarking framework.

Related benchmarks:

lodash.round VS Math.round with precision (version: 0)

Compare round lodash function vs javascript native toFixed() function. use random input to avoid js engine optimisation

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

Created: 2 years ago by: Guest

Jump to the latest result

Round floating number using lodash round function

Round floating number using toFixed()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 4 months ago):