Benchmark: lodash uniq() vs spread new Set()

HTML Preparation code:

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

Tests:

lodash
const arr = Array.from({length: 100000}, (_, i) => i % 2) return _.uniq(arr);
spread new Set
const arr = Array.from({length: 100000}, (_, i) => i % 2) return [...new Set(arr)]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
spread new Set

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is defined as two individual test cases:

1. **lodash uniq()**: This test case uses the Lodash library to call its `uniq` function on an array.
2. **spread new Set()**: This test case uses JavaScript's spread operator (`...`) in combination with the `Set` constructor to achieve a similar result.

**What's being tested?**

Both test cases are measuring the performance of removing duplicates from an array. The primary difference is how this operation is implemented:

* Lodash's `uniq` function uses its own implementation, which likely involves iterating over the input array and keeping track of unique elements.
* JavaScript's spread operator (`...`) in combination with the `Set` constructor creates a new set by spreading the input array into it. This automatically removes duplicates.

**Options Compared**

The two test cases are comparing:

1. **Lodash's uniq() function**: An external library implementation for removing duplicates from an array.
2. **JavaScript's spread operator (`...`) and Set constructor**: A built-in JavaScript combination for achieving a similar result without relying on an external library.

**Pros and Cons of Each Approach**

* **Lodash's uniq() function**:
	+ Pros:
		- Often provides better performance due to optimized implementation.
		- Can handle more complex scenarios, like preserving order or handling edge cases.
	+ Cons:
		- Requires loading the Lodash library, which can introduce additional overhead.
		- May not be suitable for projects that want to avoid external dependencies.
* **JavaScript's spread operator (`...`) and Set constructor**:
	+ Pros:
		- No additional libraries or overhead required.
		- Efficiently removes duplicates in most cases.
	+ Cons:
		- Can have performance issues with very large input arrays (e.g., O(n^2) complexity due to hash collisions).
		- May not preserve order of elements.

**Library and Purpose**

The `lodash` library is a widely used utility belt for functional programming, providing a variety of functions for tasks like array manipulation, string processing, and more. The `uniq` function in particular is designed to efficiently remove duplicates from an array while preserving the original order of elements.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being used in this benchmark that would require prior knowledge beyond basic JavaScript understanding.

**Other Alternatives**

For removing duplicates from an array, other alternatives exist, such as:

1. **Array.prototype.filter()**: Repeatedly calls `filter()` on the input array to remove elements, which can lead to performance issues with large arrays.
2. **Array.prototype.reduce()**: Uses a callback function to iterate over the array and accumulate unique values.
3. **Use of custom implementation**: A developer could write their own implementation for removing duplicates from an array.

Keep in mind that these alternatives might not offer better performance or maintainability than using established libraries like Lodash or JavaScript's built-in `Set` constructor.

In summary, this benchmark compares the performance of two approaches to remove duplicates from an array: a third-party library (`lodash`) and a built-in JavaScript combination (`spread operator and Set constructor`).

Related benchmarks:

lodash uniq() vs spread new Set() (version: 0)

Comparing performance of: lodash vs spread new Set

Created: 2 years ago by: Guest

Jump to the latest result

lodash

spread new Set

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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