Benchmark: lodash uniq vs set2

HTML Preparation code:


<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>

Script Preparation code:

var arr = [5,1,3,7,9,2,11];
var mySet = new Set(arr);

Tests:

set
mySet.add(12); mySet.add(12); mySet.add(5); mySet.add(17); mySet.add(1); mySet.add(11); return arr;
uniq
arr = _.uniq(arr.push(12)); arr = _.uniq(arr.push(12)); arr = _.uniq(arr.push(5)); arr = _.uniq(arr.push(17)); arr = _.uniq(arr.push(1)); arr = _.uniq(arr.push(12)); return arr;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
set
uniq

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark compares two JavaScript methods for removing duplicates from an array: `lodash uniq` (from the Lodash library) and the built-in `Set` object in JavaScript.

**Options Compared**

The two options are:

1. **Lodash uniq**: This method uses a similar approach to the built-in `Set` object, but with additional features like handling null and undefined values, and preserving the original order of elements.
2. **Built-in Set object**: This method uses an internal implementation that stores unique values in an array-like data structure.

**Pros and Cons**

1. **Lodash uniq**
	* Pros:
		+ Preserves the original order of elements
		+ Handles null and undefined values
	* Cons:
		+ May be slower due to the additional features
2. **Built-in Set object**
	* Pros:
		+ Generally faster than Lodash uniq
		+ More lightweight, as it doesn't require an external library
	* Cons:
		+ Doesn't preserve the original order of elements
		+ Throws an error if you try to add a null or undefined value

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, object creation, and more. The `uniq` function in particular is designed to remove duplicate values from an array while preserving the original order.

In the benchmark, Lodash uniq is used to create a set-like data structure with unique values, allowing us to compare its performance with the built-in Set object.

**Special JS Feature: Rest Parameter**

The test cases use the rest parameter syntax (`arr.push(12)`) to dynamically add elements to an array. This feature allows you to pass a variable number of arguments to a function, which is useful for tasks like the benchmark where we need to add multiple values to an array.

**Benchmark Preparation Code**

The preparation code sets up the test data and environment:

* `var arr = [5,1,3,7,9,2,11];`: Creates an initial array with duplicate values.
* `var mySet = new Set(arr);`: Creates a Set object from the array, which is used as a baseline for Lodash uniq.

**Individual Test Cases**

The two test cases are:

1. **set**: This test case uses the built-in Set object to remove duplicates from the initial array and returns the resulting array.
2. **uniq**: This test case uses Lodash uniq to remove duplicates from the initial array and returns the resulting array.

**Latest Benchmark Result**

The latest benchmark result shows that the `uniq` test (using Lodash) performs slightly better than the `set` test (using the built-in Set object), with approximately 115,800 more executions per second. However, this difference is relatively small, suggesting that both methods are suitable for most use cases.

**Other Alternatives**

Some other alternatives to removing duplicates from an array in JavaScript include:

* Using a filter function with the `every()` method: `arr.filter((element) => arr.indexOf(element) === -1)`
* Using a map function with the `filter()` method: `arr.map((element) => element).filter((element, index, self) => self.indexOf(element) === index)`
* Using an array's built-in `reduce()` method: `arr.reduce((acc, element) => acc.includes(element) ? acc : [element], [])`

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:94.0) Gecko/20100101 Firefox/94.0

Browser/OS: Firefox 94 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
set	6824063.0 Ops/sec
uniq	7982080.5 Ops/sec

Related benchmarks:

lodash uniq vs set2 (version: 0)

Comparing performance of: set vs uniq

Created: 6 years ago by: Guest

Jump to the latest result

set

uniq

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):