Benchmark: Lodash _.last vs native

HTML Preparation code:

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

Script Preparation code:

var arr1 = [1,2,3,4,5,6,7,8,9];
var arr2 = [];
var arr3 = undefined;
var arr4 = ['asdsa', 3, undefined, 32, 1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8];

Tests:

lodash
_.last(arr1) _.last(arr2) _.last(arr3) _.last(arr4)
native
arr1?.reverse()?.[0] arr2?.reverse()?.[0] arr3?.reverse()?.[0] arr4?.reverse()?.[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
native

Fastest: N/A

Slowest: N/A

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

**Benchmark Definition**

The benchmark is comparing two approaches to get the last element of an array:

1. Using the `_last` function from Lodash, a popular utility library for JavaScript.
2. Using the `?.reverse()?.[0]` syntax, which is a shorthand way to reverse the array and then access the first element.

**Options Compared**

The two options being compared are:

* **Lodash**: The `_last` function is part of the Lodash library, which provides a set of high-order functions for working with arrays, objects, and other data structures.
	+ Pros:
		- Well-maintained and widely used library
		- Provides additional functionality beyond just getting the last element
	+ Cons:
		- Adds dependency on an external library
		- May introduce overhead due to the size of the library
* **Native**: The `?.reverse()?.[0]` syntax is a shorthand way to reverse the array and then access the first element using only built-in JavaScript functionality.
	+ Pros:
		- No additional dependencies or overhead
		- More efficient, as it uses native functions
	+ Cons:
		- Less readable and maintainable for complex operations
		- May not work in older browsers or environments that don't support this syntax

**Library**

The Lodash library is a popular utility library that provides a set of high-order functions for working with arrays, objects, and other data structures. It's widely used in JavaScript development due to its simplicity and flexibility.

**Special JS Feature/Syntax**

There isn't any special JavaScript feature or syntax being tested in this benchmark, aside from the `?.` syntax which is called the "optional chaining" operator. This operator was introduced in ECMAScript 2020 (ES12) as a way to safely navigate nested properties without throwing errors.

**Other Considerations**

When choosing between these two approaches, consider the trade-offs:

* If you need more functionality beyond just getting the last element of an array, Lodash might be a better choice.
* If you prioritize performance and efficiency, using native functions like `?.reverse()?.[0]` might be a better option.

**Alternatives**

Other alternatives for getting the last element of an array include:

* Using the `slice()` method to create a new array with the last element: `arr.slice(-1)`
* Using the `at()` method (available in modern browsers): `arr.at(-1)`

Related benchmarks:

Lodash _.last vs native (version: 1)

Comparing performance of: lodash vs native

Created: 5 years ago by: Registered User

Jump to the latest result

lodash

native

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):