Benchmark: _.uniq() vs Set() over large array

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.11/lodash.min.js"></script>

Script Preparation code:

var values = _.fill(Array(100000), null).map(() => _.random(0,9));

Tests:

lodash uniq
const results = _.uniq(values);
Set
const results = [...new Set(values)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash uniq
Set

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, compared, and considered.

**What is tested:**
The benchmark compares two approaches to remove duplicates from an array:

1. **Lodash `_.uniq()`**: This function removes duplicate values from an array while preserving the original order.
2. **JavaScript `Set` object**: A built-in JavaScript data structure that automatically eliminates duplicate values when used as a collection of unique elements.

**Options compared:**
The benchmark compares the performance of two approaches:

1. Lodash `_.uniq()`
2. JavaScript `Set` object

**Pros and Cons of each approach:**

* **Lodash `_.uniq()`**: Pros:
	+ Easy to use and understand, especially for developers familiar with Lodash.
	+ Handles edge cases like preserving the original order.
Cons:
	+ Requires an external library (Lodash), which adds overhead.
	+ May not be as efficient as native JavaScript implementation for large datasets.
* **JavaScript `Set` object**: Pros:
	+ Native to JavaScript, so no additional library is required.
	+ Efficient for large datasets, as it uses a hash table internally.
Cons:
	+ Requires understanding of the `Set` data structure and its behavior.

**Library and purpose:**
The `_.uniq()` function from Lodash is a utility function that removes duplicate values from an array while preserving the original order. It returns a new array with unique elements, leaving the original array unchanged.

**Special JS feature or syntax:**
There is no special JavaScript feature or syntax used in this benchmark.

**Other alternatives:**
For removing duplicates from an array, other alternatives could include:

1. Using `Array.prototype.filter()`: Create a new array with only unique elements by filtering out duplicates.
2. Using `Array.prototype.reduce()`: Reduce the array to a single unique element by accumulating unique values and ignoring duplicates.
3. Manual iteration using a loop: Iterate over the array, keeping track of seen values in an object or Set data structure.

However, these alternatives may not be as efficient or elegant as the Lodash `_.uniq()` function or the JavaScript `Set` object for large datasets.

In summary, this benchmark compares two popular approaches to remove duplicates from an array: Lodash's `_.uniq()` and the JavaScript `Set` object. The choice of approach depends on trade-offs between ease of use, efficiency, and external library dependencies.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0

Browser/OS: Firefox 64 on Linux

View result in a separate tab

Test name	Executions per second
lodash uniq	288.6 Ops/sec
Set	290.9 Ops/sec

Related benchmarks:

_.uniq() vs Set() over large array (version: 2)

Comparing performance of: lodash uniq vs Set

Created: 6 years ago by: Registered User

Jump to the latest result

lodash uniq

Set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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