Benchmark: lodash uniq vs native uniqoififie3f02i409rfi23k

HTML Preparation code:

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

Script Preparation code:

var obj = [1, 2, 3, 4, 6, 6, 4, 1, 2, 2, 3];

Tests:

native uniq
let u = obj.filter((elem, ind, arr)=>arr.indexOf(elem) === ind)
ld uniq
let u = _.uniq(obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
native uniq
ld uniq

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser/OS: Chrome 105 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
native uniq	5563020.0 Ops/sec
ld uniq	3817388.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark measures the performance of two approaches to remove duplicates from an array: the native `Array.prototype.filter()` method and the Lodash library's `uniq()` function.

**Script Preparation Code**

The script preparation code creates a sample array `obj` with duplicate elements:
```javascript
var obj = [1, 2, 3, 4, 6, 6, 4, 1, 2, 2, 3];
```
This array is used to test the performance of both approaches.

**Html Preparation Code**

The HTML preparation code includes a reference to the Lodash library, which is required for the `uniq()` function:
```html
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
```
This library provides the `uniq()` function that will be compared to the native approach.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. **Native uniq**: This test case uses the native `Array.prototype.filter()` method to remove duplicates from the `obj` array.
```javascript
let u = obj.filter((elem, ind, arr)=>arr.indexOf(elem) === ind);
```
2. **Ld uniq**: This test case uses the Lodash library's `uniq()` function to remove duplicates from the `obj` array.
```javascript
let u = _.uniq(obj);
```
**Approaches Comparison**

The two approaches have different performance characteristics:

* **Native uniq**: The native approach uses a simple filtering algorithm that iterates over the array and checks for duplicate elements. This approach has a time complexity of O(n^2), where n is the length of the array.
* **Ld uniq**: The Lodash library's `uniq()` function uses a more efficient algorithm called "stable sort" to remove duplicates. This approach has a time complexity of O(n log n).

**Pros and Cons**

* **Native uniq**:
	+ Pros: No additional dependencies, easy to understand.
	+ Cons: O(n^2) time complexity, may be slower for large arrays.
* **Ld uniq**:
	+ Pros: More efficient algorithm (O(n log n)), widely supported library.
	+ Cons: Additional dependency on Lodash library.

**Library and Its Purpose**

The Lodash library is a popular utility library that provides a wide range of functions for common tasks, such as array manipulation, string manipulation, and more. The `uniq()` function is specifically designed to remove duplicates from an array while preserving the original order.

**Special JS Feature or Syntax**

None of the provided benchmark code uses any special JavaScript features or syntax beyond standard ES6 syntax.

**Alternatives**

Other alternatives for removing duplicates from an array include:

* Using a hash table (e.g., `Map`) to keep track of unique elements.
* Using a more advanced algorithm like "bucket sort" or "counting sort".
* Using a different library, such as Moment.js or Immutable.js.

However, the Lodash library's `uniq()` function is widely supported and easy to use, making it a popular choice for many developers.

Related benchmarks:

lodash uniq vs native uniqoififie3f02i409rfi23k (version: 0)

Comparing performance of: native uniq vs ld uniq

Created: 2 years ago by: Registered User

Jump to the latest result

native uniq

ld uniq

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):