Benchmark: lodash uniq vs set vs uniqSort

HTML Preparation code:

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

Tests:

Set then sort
var l = new Set([1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]); return [...new Set(l)].sort();
uniq then sort
var l = ["A", "B", "C", "C", "A", "F", "Z", "M", "M", "M", "M", "P", "R", "Q", "A", "F"]; return _.uniq(l).sort();
sort then sortedUniq
var l = ["A", "B", "C", "C", "A", "F", "Z", "M", "M", "M", "M", "P", "R", "Q", "A", "F"]; return _.sortedUniq(l.sort());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Set then sort
uniq then sort
sort then sortedUniq

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
Set then sort	724893.2 Ops/sec
uniq then sort	747303.0 Ops/sec
sort then sortedUniq	487868.8 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and benchmark.

**Benchmark Overview**

The benchmark is designed to compare the performance of three different approaches:

1. Using a `Set` object, followed by sorting the set (referred to as "Set then sort").
2. Using the `_uniq` function from the Lodash library, which removes duplicates from an array, followed by sorting the resulting array (referred to as "uniq then sort").
3. Using the `_sortedUniq` function from the Lodash library, which sorts and removes duplicates in a single step (referred to as "sort then sortedUniq").

**Set vs Uniq**

The "Set then sort" approach uses a `Set` object to remove duplicates from an array, followed by sorting the set. Here's why this might be considered:

Pros:

* Simple and straightforward implementation.
* Good for edge cases where you need to remove duplicates before sorting.

Cons:

* Creating a `Set` object involves iterating over the entire array, which can be slower than other methods.
* Sorting a `Set` is not as efficient as sorting an array, since `Set`s are typically implemented as hash tables and don't have a built-in sorting algorithm.

**Uniq vs Sorted Uniq**

The "_uniq then sort" approach uses the `_uniq` function from Lodash to remove duplicates from an array, followed by sorting the resulting array. Here's why this might be considered:

Pros:

* Lodash provides optimized implementation for removing duplicates and sorting.
* This approach avoids creating a `Set` object, which can reduce memory usage.

Cons:

* The `_uniq` function may have additional overhead compared to using a simple `Set`.
* Sorting the resulting array from `_uniq` might not be as efficient as sorting an array directly.

**Sorted Uniq**

The "sort then sortedUniq" approach uses the `_sortedUniq` function from Lodash, which sorts and removes duplicates in a single step. Here's why this might be considered:

Pros:

* Optimized implementation that combines two operations into one.
* Avoids the overhead of creating a `Set` object or sorting an array separately.

Cons:

* May have additional complexity compared to simpler approaches like "Set then sort".
* Requires the use of Lodash, which may add extra dependencies.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for tasks like array manipulation, string processing, and more. The `_uniq` and `_sortedUniq` functions are part of this library, providing optimized implementations for removing duplicates and sorting arrays.

In the benchmark, using Lodash's `_sortedUniq` function takes advantage of its optimized implementation to combine two operations into one, potentially improving performance compared to simpler approaches.

**Other Alternatives**

If you don't have access to Lodash or prefer not to use it, alternative approaches could include:

* Using a simple `Set` object and sorting it manually.
* Implementing your own `_uniq` function using iteration over the array.
* Using other libraries that provide similar functionality to Lodash.

Keep in mind that each of these alternatives may have trade-offs in terms of performance, complexity, or dependencies.

Related benchmarks:

lodash uniq vs set vs uniqSort (version: 0)

Comparing performance of: Set then sort vs uniq then sort vs sort then sortedUniq

Created: 3 years ago by: Guest

Jump to the latest result

Set then sort

uniq then sort

sort then sortedUniq

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):