Benchmark: Lodash's uniq vs new Set

HTML Preparation code:

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

Tests:

Set
var l = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]; return new Set(l);
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
Set
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/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
Set	3380389.2 Ops/sec
uniq	6212914.0 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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is comparing two approaches to remove duplicates from an array of numbers: using the `Set` data structure in JavaScript and using Lodash's `uniq` function.

**What are Set and uniq?**

* `Set`: A built-in JavaScript data structure that stores unique values. It's an object that only allows you to add, remove, or check for the existence of its elements without maintaining any particular order.
* `uniq`: A utility function from Lodash, a popular JavaScript library for functional programming tasks. `uniq` takes an array as input and returns a new array with duplicate elements removed.

**Options Compared**

The two options being compared are:

1. **Set**: Using the built-in `Set` data structure to remove duplicates.
2. **uniq**: Using Lodash's `uniq` function to remove duplicates.

**Pros and Cons of Each Approach**

* **Set**:
	+ Pros: Built-in JavaScript, efficient for small arrays, easy to use.
	+ Cons: Not optimized for large arrays, can be slower than other approaches, may not handle edge cases like null or undefined values.
* **uniq**:
	+ Pros: Optimized for performance, handles edge cases like null and undefined values, part of a popular and well-maintained library (Lodash).
	+ Cons: Requires an additional dependency (Lodash), can be slower than other approaches for very large arrays.

**Other Considerations**

* **Memory Usage**: The `Set` approach typically uses less memory than the `uniq` approach, especially for larger arrays.
* **Performance**: The performance difference between the two approaches is relatively small, but the `uniq` approach may have a slight advantage due to its optimization and handling of edge cases.

**Library Used**

The benchmark uses Lodash (version 4.17.10) as a dependency. Lodash provides many useful functions for tasks like array manipulation, object transformation, and functional programming.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. The code only uses standard JavaScript features, such as arrays, objects, and the `Set` data structure.

**Alternatives**

If you're looking for alternative approaches to remove duplicates from an array, some options include:

* Using a simple loop with `push` and `indexOf` methods.
* Using the `filter()` method to remove elements that are not unique.
* Using a library like Ramda or Immutable.js, which provide similar functionality to Lodash.

Related benchmarks:

Lodash's uniq vs new Set (version: 0)

Comparing performance of: Set vs uniq

Created: 5 years ago by: Guest

Jump to the latest result

Set

uniq

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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