Benchmark: Lodash uniqBy vs Set 10000

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var MyArr = Array.from({length: 10000}, () => Math.floor(Math.random() * 40));

var myCopy = null;

Tests:

Lodash uniqBy
myCopy = _.uniqBy(MyArr);
Set
myCopy = [...new Set(MyArr)]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash uniqBy
Set

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Lodash uniqBy	12496.2 Ops/sec
Set	5941.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this specific benchmark.

**Benchmark Overview**

The benchmark compares the performance of two approaches to remove duplicate elements from an array:

1. Lodash's `uniqBy` function
2. The `Set` object (a built-in JavaScript data structure)

**Lodash uniqBy**

Lodash is a popular JavaScript utility library that provides a wide range of functional programming helpers. In this case, `uniqBy` is used to remove duplicate elements from an array based on a specified key.

When the benchmark runs, Lodash's `uniqBy` function is executed with the `MyArr` array as input. The resulting unique array is stored in the `myCopy` variable.

**Set**

The `Set` object is a built-in JavaScript data structure that stores unique values. In this benchmark, it's used to create a set from the `MyArr` array and then convert it back to an array using the spread operator (`[...]`).

**Options Comparison**

There are two main options being compared:

1. **Lodash uniqBy**: This approach uses Lodash's `uniqBy` function to remove duplicates based on the specified key.
2. **Set**: This approach uses a built-in JavaScript data structure (`Set`) to store unique values.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

* **Lodash uniqBy**:
	+ Pros: Lodash provides a convenient and efficient way to remove duplicates, and it's well-tested and widely used.
	+ Cons: It requires an additional library (Lodash) and may introduce additional overhead due to its complexity.
* **Set**:
	+ Pros: It's a built-in JavaScript data structure, so no additional libraries are required. It's also relatively lightweight and efficient.
	+ Cons: It may not be as convenient or expressive as Lodash's `uniqBy` function.

**Library and Purpose**

In this benchmark, the library being used is Lodash (version 4.17.5). The purpose of Lodash is to provide a set of utility functions that make it easier to write JavaScript code, particularly functional programming code.

**Special JS Feature or Syntax**

There doesn't appear to be any special JavaScript features or syntax being tested in this benchmark. Both `uniqBy` and the `Set` approach rely on standard JavaScript language features.

**Other Alternatives**

If you're looking for alternative approaches to remove duplicates from an array, here are a few options:

* **Using `reduce()`**: You can use the `reduce()` method to create a new array with unique elements.
* **Using `filter()` and `includes()`**: You can use `filter()` to create a new array with unique elements and then check for existence using `includes()`.
* **Using `Array.from()` and `Set`**: As shown in this benchmark, you can use `Array.from()` to convert an iterable to an array and then pass it to a `Set`, which will automatically remove duplicates.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

Lodash uniqBy vs Set 10000 (version: 0)

Comparing performance of: Lodash uniqBy vs Set

Created: 4 years ago by: Guest

Jump to the latest result

Lodash uniqBy

Set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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