Benchmark: array from set vs lodash uniq

HTML Preparation code:

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

Tests:

Array from set
var l = Array.from(new Set([1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7])); return l;
lodash uniq
var l = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]; return _.uniq(l);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array from set
lodash uniq

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Windows

View result in a separate tab

Test name	Executions per second
Array from set	2535594.8 Ops/sec
lodash uniq	4292113.0 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 and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to remove duplicates from an array: using `Array.from` with a `Set` constructor, and using Lodash's `uniq` function. The goal is to determine which approach is faster for this specific use case.

**Options Compared**

1. **Array.from(new Set([array]))**: This method uses the `Set` constructor to create an immutable set from the input array, which automatically removes duplicates. It then converts the set back into an array using `Array.from`.
2. **Lodash's `uniq(l)`**: Lodash's `uniq` function takes an array as input and returns a new array with duplicates removed.

**Pros and Cons**

1. **Array.from(new Set([array]))**:
	* Pros: Simple, efficient, and well-supported by modern browsers.
	* Cons: May require additional setup (e.g., importing Lodash) for non-browser environments.
2. **Lodash's `uniq(l)`**:
	* Pros: Widely available, easy to use, and flexible (accepts various input types).
	* Cons: Adds dependency on Lodash, which may not be desirable in all situations.

**Other Considerations**

* The benchmark uses Chrome 123 as the test browser, which is a relatively modern version.
* The tests are run on desktop platforms, which may affect performance compared to mobile or tablet devices.
* The benchmark does not account for edge cases like empty input arrays or arrays with only unique elements.

**Library and Syntax**

Lodash's `uniq` function is used as part of the benchmark. Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, string formatting, and more.

The `Array.from(new Set([array]))` approach uses modern JavaScript features like the `Set` constructor and `Array.from`.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes used in this benchmark. The code is straightforward and uses standard JavaScript constructs.

Now, let's talk about alternative approaches:

* **Using a custom implementation**: You could write your own function to remove duplicates from an array using a simple algorithm like iterating over the array and checking for matches.
* **Other libraries**: Other libraries like Underscore.js or Ramda provide similar functionality to Lodash's `uniq` function. However, these alternatives may have different performance characteristics or use cases.
* **Built-in methods**: Some browsers (like Firefox) have built-in methods for removing duplicates from an array, such as `Array.from(new Set(arr))`. These methods might offer better performance than the `uniq` function.

In summary, the benchmark compares two approaches to remove duplicates from an array: using a modern JavaScript feature like `Set` and `Array.from`, and using Lodash's widely available `uniq` function. The choice of approach depends on your specific use case, desired dependencies, and performance requirements.

Related benchmarks:

array from set vs lodash uniq (version: 0)

Comparing performance of: Array from set vs lodash uniq

Created: 2 years ago by: Guest

Jump to the latest result

Array from set

lodash uniq

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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