Benchmark: uniq vs set vs filter vs forEach

HTML Preparation code:

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

Tests:

Set
var myArray = new Set([1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]); return myArray;
uniq
var myArray = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]; return _.uniq(myArray);
Array Filter
var myArray = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]; return myArray.filter((c, index) => { return myArray.indexOf(c) === index; });
Array forEach
var myArray = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]; let uniqueChars = []; myArray.forEach((c) => { if (!uniqueChars.includes(c)) { uniqueChars.push(c); } }); return uniqueChars;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Set
uniq
Array Filter
Array forEach

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the provided benchmark and explore what's being tested.

**Benchmark Overview**

The benchmark compares four JavaScript methods to remove duplicates from an array:

1. `Set`
2. `uniq` (a function from the Lodash library)
3. `Array Filter`
4. `Array forEach`

**Options Being Compared**

Here's a brief overview of each option and their pros and cons:

### 1. Set

* **Pros:**
	+ Fast and efficient, with an average time complexity of O(1) for insertion and lookup operations.
	+ Does not require a separate data structure to store unique elements.
* **Cons:**
	+ Requires creating a new `Set` object, which may incur additional overhead.
	+ May have memory implications if the set is very large.

### 2. uniq (Lodash)

* **Pros:**
	+ Convenient and easy-to-use function from a popular library.
	+ Handles edge cases like null or undefined values.
* **Cons:**
	+ Requires an external dependency (the Lodash library).
	+ May have performance overhead due to the library's complexity.

### 3. Array Filter

* **Pros:**
	+ Native JavaScript method, so no additional dependencies are required.
	+ Can be optimized by modern browsers using SIMD instructions.
* **Cons:**
	+ Time complexity of O(n^2) in the worst case, making it less efficient than Set or uniq.

### 4. Array forEach

* **Pros:**
	+ Another native JavaScript method with no additional dependencies required.
	+ Can be optimized by modern browsers using SIMD instructions.
* **Cons:**
	+ Similar to `Array Filter`, its time complexity is O(n^2) in the worst case, making it less efficient than Set or uniq.

**Library Used**

The Lodash library is used for the `uniq` function. Lodash provides a wide range of utility functions, including `uniq`, which helps make JavaScript code more concise and expressive.

**Special JS Feature/Syntax**

None mentioned in this benchmark.

**Alternative Approaches**

Other approaches to remove duplicates from an array include:

1. Using a hash table or object to keep track of unique elements.
2. Implementing a custom sorting algorithm followed by removal of duplicates.
3. Using a binary search tree data structure to efficiently retrieve and remove duplicates.

However, these approaches are often more complex and may not be as efficient as the methods being compared in this benchmark.

**Additional Considerations**

When choosing an approach to remove duplicates from an array:

1. Performance: Consider the time complexity of each method and its impact on your use case.
2. Memory usage: If you're working with large datasets, consider the memory implications of using a data structure like a Set or object.
3. Browser support: Ensure that the chosen method is supported by modern browsers, especially if you plan to deploy it in production.

By considering these factors and exploring the provided benchmark results, you can make informed decisions about which approach best suits your specific use case.

Related benchmarks:

uniq vs set vs filter vs forEach (version: 0)

Comparing performance of: Set vs uniq vs Array Filter vs Array forEach

Created: 3 years ago by: Guest

Jump to the latest result

Set

uniq

Array Filter

Array forEach

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):