Benchmark: Lodash's uniq vs Array from 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 Array.from(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: 11 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Set	8701142.0 Ops/sec
uniq	25772230.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript benchmark test case, where two different approaches to remove duplicates from an array are compared: using the `Array.from(new Set(l))` method and Lodash's `uniq()` function.

**Test Cases**

There are two individual test cases:

1. **Set**: This test case uses the `Array.from(new Set(l))` method to remove duplicates from the input array `[1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]`.
2. **uniq**: This test case uses Lodash's `uniq()` function to remove duplicates from the same input array `[1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]`.

**Library: Set**

The `Set` object in JavaScript is a collection of unique values. When used with the `Array.from()` method, it creates a new array containing only the unique elements from the original array.

In this test case, the `Set` library is used to remove duplicates by converting the input array to a `Set`, which automatically removes any duplicate values. The resulting set is then converted back to an array using `Array.from()`, producing an array with no duplicates.

**Library: Lodash's uniq**

Lodash is a popular JavaScript utility library that provides various functions for tasks like string manipulation, array manipulation, and more. The `uniq()` function in Lodash removes duplicate values from an array.

In this test case, the `uniq()` function is used to remove duplicates from the input array `[1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]`. The resulting array contains only unique values.

**Comparison**

The main difference between these two approaches is the way they handle duplicate elements:

1. **Set**: When using the `Array.from(new Set(l))` method, any duplicate elements are simply ignored, and the resulting array contains only unique values.
2. **uniq**: Lodash's `uniq()` function, on the other hand, includes the first occurrence of each element in the output array, discarding subsequent duplicates.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Set**:
	+ Pros: Efficient, simple implementation, and always produces an array with unique values.
	+ Cons: May not include duplicate elements, which might be desirable in certain situations.
* **uniq**: 
	+ Pros: Includes the first occurrence of each element, making it suitable for use cases where duplicates need to be preserved or processed differently.
	+ Cons: Less efficient than `Set` due to the extra processing required by Lodash's implementation.

**Other Considerations**

When choosing between these two approaches, consider the specific requirements of your use case:

* If you need an array with only unique values and don't care about preserving duplicates, `Set` is likely a better choice.
* If you need to preserve duplicate elements or process them differently, Lodash's `uniq()` function might be a better fit.

**Alternatives**

Other alternatives for removing duplicates from arrays in JavaScript include:

1. Using the spread operator (`[...new Set(arr)]`) with modern browsers and Node.js
2. Using a custom implementation using loops or recursive functions

However, these alternatives may not offer the same level of performance, simplicity, or convenience as `Set` and Lodash's `uniq()` function.

Related benchmarks:

Lodash's uniq vs Array from 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):