Benchmark: Lodash takeRight vs slice correct

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

function getRandomInt(max) {
  return Math.floor(Math.random() * Math.floor(max));
}

var arr = [];
for(var i = 0; i < 100000; i++){
  arr.push({value:getRandomInt(100)});
}

Tests:

_.takeRight
_.takeRight(arr, 3);
array.prototype.slice
arr.slice(-3);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.takeRight
array.prototype.slice

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/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Mac OS X 10.15.7

View result in a separate tab

array.prototype.slice

24.6M/s

_.takeRight

11.7M/s

View exact numbers

Test name	Executions per second
✓ array.prototype.slice	24,602,364 Ops/sec
_.takeRight	11,669,805 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 and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The test case measures the performance of two JavaScript functions: `lodash.takeRight(arr, 3)` and `arr.slice(-3)`. Both functions aim to return a subset of elements from an array `arr`, but they use different approaches.

**What are we testing?**

* We're comparing the execution time of two different ways to extract the last 3 elements from an array.
	+ Method 1: Using Lodash's `takeRight` function, which is a utility function that returns a new array containing the elements starting from the end of the original array up to the specified length (in this case, 3).
	+ Method 2: Using the built-in `slice` method on an array, which returns a new array with a subset of elements.

**What options are compared?**

The two options being compared are:

1. **Lodash's `takeRight` function**: This is a third-party library that provides a convenient way to manipulate arrays.
2. **Built-in `slice` method on an array**: This is a native JavaScript method that allows you to extract a subset of elements from an array.

**Pros and Cons of each approach**

1. **Lodash's `takeRight` function**
	* Pros:
		+ Convenient and easy to use.
		+ Returns a new array, which can be beneficial for performance reasons (avoiding mutations).
		+ Well-maintained and widely adopted library.
	* Cons:
		+ Additional dependency on the Lodash library.
		+ May introduce additional overhead due to the function call.
2. **Built-in `slice` method**
	* Pros:
		+ Native JavaScript implementation, potentially faster and more lightweight.
		+ No additional dependencies or overhead.
	* Cons:
		+ Can be less convenient to use than Lodash's `takeRight`.
		+ May modify the original array (which can lead to unexpected behavior).

**Other considerations**

* **Performance**: The built-in `slice` method may have a slight performance advantage due to its native implementation and lack of overhead.
* **Readability and maintainability**: Lodash's `takeRight` function is often considered more readable and easier to understand, especially for developers unfamiliar with the `slice` method.

**Library used**

The test case uses the Lodash library, which provides a convenient way to manipulate arrays. Specifically, it uses the `lodash.takeRight` function to extract the last 3 elements from the array.

**Special JS feature or syntax**

There is no special JavaScript feature or syntax mentioned in this benchmark.

**Alternatives**

If you're interested in exploring alternative approaches, here are some options:

1. **Using `Array.prototype.slice()` with a custom implementation**: You can write your own custom function to extract the last 3 elements from an array using the `slice` method.
2. **Using other libraries or frameworks**: Depending on your project's requirements and constraints, you might consider using other libraries or frameworks that provide similar functionality (e.g., Array.prototype.slice alternatives).
3. **Native JavaScript methods**: Explore other native JavaScript methods for manipulating arrays, such as `Array.prototype.at()`, `Array.prototype.entries()`, etc.

In conclusion, this benchmark compares the performance of two approaches to extract the last 3 elements from an array: using Lodash's `takeRight` function and the built-in `slice` method on an array. The results suggest that the built-in `slice` method may have a slight performance advantage, but the choice ultimately depends on readability, maintainability, and specific use cases.

Lodash takeRight vs slice correct (version: 0) Benchmark.js

Comparing performance of: `_.takeRight vs array.prototype.slice`

Created: 5 years ago by: Guest

Go to the latest result

_.takeRight

array.prototype.slice

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Lodash takeRight vs slice correct (version: 0) Benchmark.js

Comparing performance of: _.takeRight vs array.prototype.slice

Created: 5 years ago by: Guest

Go to the latest result

_.takeRight

array.prototype.slice

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `_.takeRight vs array.prototype.slice`