Benchmark: lodash UniqueWith vs filter

Script Preparation code:

var myArray = Array(3000).fill({a:1, b:2});

Tests:

_.uniqWith
myArray = _.uniqWith(array, _.isEqual);
filter
const trackObj = {}; myArray = myArray.filter(item => { if (trackObj[item.a] && trackObj[item.a] === item.b) { return false; } trackObj[item.a] = item.b; return true; })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.uniqWith
filter

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
_.uniqWith	0.0 Ops/sec
filter	22378852.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the provided benchmark.

**Benchmark Overview**

The benchmark is comparing two approaches for removing duplicates from an array: `_.uniqWith` from Lodash and the built-in `filter()` method.

**Lodash `.uniqWith`**

`_.uniqWith` is a function from the Lodash library that removes duplicate elements from an array based on a custom comparison function. In this benchmark, the comparison function used is `_isEqual`, which checks for deep equality between two objects.

Pros:

* Efficient: `_.uniqWith` uses a clever algorithm to remove duplicates in O(n) time complexity.
* Customizable: The comparison function allows users to tailor the behavior to their specific use case.

Cons:

* Additional dependency: Using Lodash introduces an extra dependency, which may not be desirable for small projects or those with strict dependencies constraints.
* Performance overhead: Some browsers might incur a slight performance overhead due to the additional JavaScript execution.

**Built-in `filter()` method**

The built-in `filter()` method is a vanilla JavaScript function that creates a new array with only the elements that pass a test implemented by a provided function.

Pros:

* Native support: The `filter()` method is native to JavaScript, so it doesn't require any additional dependencies or libraries.
* Lightweight: The `filter()` method is generally faster and more lightweight than using Lodash.

Cons:

* Less flexible: The `filter()` method only provides basic filtering functionality; it's not as powerful as `.uniqWith`.

**Other considerations**

In terms of special JavaScript features, this benchmark doesn't use any advanced techniques like async/await, Promises, or modern array methods (e.g., `some()`, `every()`). If you're interested in exploring those topics, there are plenty of other benchmarks that focus on performance optimization.

**Alternatives**

If you're looking for alternative approaches to remove duplicates from an array, consider the following options:

1. Using a simple array method: You can use methods like `reduce()` or `map()` to create a new array with unique elements.
2. Implementing a custom sorting algorithm: Sorting the array and then removing duplicates using the `filter()` method can be an efficient alternative.
3. Using a data structure like a Set: If you're working in a modern browser that supports Sets, you can convert the array to a Set and then back to an array to remove duplicates.

Keep in mind that each approach has its trade-offs, and the best solution depends on your specific use case, performance requirements, and personal preference.

Related benchmarks:

lodash UniqueWith vs filter (version: 0)

Comparing performance of: _.uniqWith vs filter

Created: 3 years ago by: Guest

Jump to the latest result

_.uniqWith

filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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