Benchmark: lodash reverse vs native Array.prototype.reverse

HTML Preparation code:

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

Script Preparation code:

var arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];

Tests:

Array.prototype.reverse
arr.reverse()
lodash reverse
_.reverse(arr)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.reverse
lodash reverse

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.reverse	17036000.0 Ops/sec
lodash reverse	8474951.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition Json**

The website allows users to create custom benchmarks, which in this case, is comparing the performance of `lodash.reverse` with `Array.prototype.reverse`.

**What is being tested?**

In this benchmark, two approaches are compared:

1. **Native Array.prototype.reverse**: This is a built-in JavaScript method that reverses the order of elements in an array. It's implemented in the browser and doesn't require any external libraries.
2. **_reverse() from lodash.js**: This is a utility function provided by the `lodash` library, which also offers many other useful functions for manipulating arrays.

**Options Compared**

The two options being compared are:

* Using the built-in `Array.prototype.reverse()` method
* Using the `_reverse()` function from the `lodash` library

**Pros and Cons of Each Approach**

**Native Array.prototype.reverse**

Pros:

* No external dependencies required
* Built-in to the browser, which reduces latency and overhead
* Simple and concise code implementation

Cons:

* May not be as efficient or optimized for large datasets
* Can be slower due to the need to iterate over the entire array

**_reverse() from lodash.js**

Pros:

* Optimized for performance and can handle larger arrays efficiently
* Reduces the need to iterate over the entire array, making it faster
* Offers additional benefits like stability and predictability

Cons:

* Requires an external library dependency (lodash.js)
* Can be slower due to the overhead of loading the library

**Library: lodash.js**

The `lodash` library is a popular JavaScript utility library that provides many functions for working with arrays, strings, numbers, and more. The `_reverse()` function is just one example of its many utility functions.

**Special JS Feature/Syntax**

There isn't any special JavaScript feature or syntax being tested in this benchmark. It's purely about comparing the performance of two different approaches to reversing an array.

**Other Alternatives**

If you're interested in other alternatives for reversing arrays, here are a few options:

* Using `Array.prototype.slice()` and then concatenating the reversed slices: `arr.slice(0).reverse().concat(arr.slice(1))`
* Using `Array.prototype.map()` and `Array.prototype.reverse()`: `arr.map((_, i) => arr[i]).reverse()`
* Using a simple loop to iterate over the array: `for (var i = 0; i < arr.length / 2; i++) { arr[i] = arr[arr.length - i - 1]; }`

These alternatives can be used in custom benchmarks to compare their performance with the native `Array.prototype.reverse()` and `_reverse()` functions from `lodash.js`.

Related benchmarks:

lodash reverse vs native Array.prototype.reverse (version: 0)

Comparing performance of: lodash reverse vs native Array.prototype.reverse

Comparing performance of: Array.prototype.reverse vs lodash reverse

Created: 3 years ago by: Registered User

Jump to the latest result

Array.prototype.reverse

lodash reverse

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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