Benchmark: Lodash Uniq vs Javascript Set 123

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.5/lodash.min.js"></script>

Script Preparation code:

var firstEqual = [];
var secondEqual = [];

for (var i=0; i<=20000; i++) {
  firstEqual.push(i);
  secondEqual.push(i);
}

var arrayToDedup = [...firstEqual, ...secondEqual];

Tests:

Lodash Uniq
_.uniq(arrayToDedup);
Javascript Set
[...new Set(arrayToDedup)]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash Uniq
Javascript Set

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks.

The provided JSON represents a benchmark test case created using MeasureThat.net, which compares the performance of two approaches to remove duplicates from an array: Lodash's `uniq` function and the built-in JavaScript `Set` data structure.

**What is being tested?**

In this benchmark, 20,000 numbers are pushed onto two arrays (`firstEqual` and `secondEqual`) in a loop. The test then removes duplicates from these arrays using two different methods:

1. **Lodash's `uniq` function**: This method uses the Lodash library to remove duplicate elements from an array.
2. **JavaScript Set**: This approach creates a new set data structure from the concatenated arrays (`firstEqual` and `secondEqual`) and then converts it back to an array, effectively removing duplicates.

**Options compared**

The two options being compared are:

1. **Lodash's `uniq` function**
	* Pros:
		+ Easy to use: simply call the `uniq` function on the input array.
		+ Optimized for performance (tested and verified by MeasureThat.net).
	* Cons:
		+ Requires an external library (Lodash) to be included in the test environment.
2. **JavaScript Set**
	* Pros:
		+ Built-in to JavaScript, so no additional libraries need to be included.
		+ Efficient for large datasets (sets use hash tables for fast lookups and insertions).
	* Cons:
		+ Requires understanding of set operations and array conversions.

**Other considerations**

When choosing between these two approaches, consider the following:

* **Library overhead**: If you don't need to remove duplicates frequently, Lodash's `uniq` function might be a better choice due to its optimized performance. However, if you're already including external libraries in your project, using JavaScript Set might be a more suitable option.
* **Learning curve**: The JavaScript Set approach requires understanding of set operations and array conversions, which might be a barrier for developers without experience with these concepts.

**Library: Lodash**

Lodash is a popular JavaScript library that provides a wide range of utility functions. In this benchmark, `uniq` is used to remove duplicate elements from an array. The `uniq` function takes two arguments:

* `array`: the input array
* `compareFunction`: an optional function that defines how elements are compared (defaults to the standard equality operator)

**Special JS feature: No special features mentioned**

There are no special JavaScript features or syntaxes used in this benchmark.

**Other alternatives**

If you're looking for alternative approaches to remove duplicates from arrays, consider:

* **Using `filter()` and `includes()`**: This method involves filtering out elements using the `includes()` function to check if an element is present in the array. While it's more straightforward than using sets, it might be slower for large datasets.
* **Using `reduce()`**: Another approach would be to use the `reduce()` function to iterate over the array and accumulate unique values. This method can be efficient but requires understanding of the reduce operation.

Keep in mind that these alternatives might not provide the same performance as the Lodash `uniq` function or JavaScript Set, which are both optimized for removing duplicates.

Related benchmarks:

Lodash Uniq vs Javascript Set 123 (version: 0)

Comparing performance of: Lodash Uniq vs Javascript Set

Created: 6 years ago by: Guest

Jump to the latest result

Lodash Uniq

Javascript 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):