Benchmark: lodash uniq vs filter

HTML Preparation code:

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

Tests:

Filter
var l = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7].filter((item, index, array) => array.indexOf(item) === index); return l;
Array
var l = [1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7]; return _.uniq(l);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Filter
Array

Fastest: N/A

Slowest: N/A

Latest 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 explaining the provided benchmark.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case, specifically comparing two approaches to remove duplicate elements from an array: `filter` and `uniq` methods (thanks to the Lodash library). The goal is to measure which approach is faster.

**Options Compared**

Two options are compared:

1. **Filter**: Using the built-in `filter` method of JavaScript arrays.
2. **Array uniq**: Using the `_uniq` function from the Lodash library, which provides a more efficient and concise way to remove duplicates from an array.

**Pros and Cons**

Here's a brief summary of each approach:

* **Filter**:
	+ Pros: Built-in, no additional dependencies required. Easy to understand.
	+ Cons: May be slower than other methods due to the overhead of checking each element against the original array.
* **Array uniq**: 
	+ Pros: Often faster and more efficient than `filter` since it uses a different algorithm that doesn't require iterating through the entire array. Also, it's a part of Lodash library which is widely used in projects.
	+ Cons: Requires the addition of an external dependency (Lodash) and may be less familiar to developers who aren't already using it.

**Library and its Purpose**

In this benchmark, the `_.uniq` function from Lodash is used. Lodash is a popular JavaScript library that provides utility functions for tasks like array manipulation, string manipulation, and more. The `_.uniq` function takes an array as input and returns a new array with duplicate elements removed.

**Special JS Feature or Syntax**

None mentioned in this specific benchmark.

**Other Alternatives**

If you're interested in exploring other approaches to remove duplicates from an array, here are some alternatives:

* Using `Set`: Creating a Set from the original array can help eliminate duplicates efficiently.
```javascript
var l = [...new Set(arr)];
```
* Using `reduce`: You can use the `reduce` method to iterate through the array and accumulate the unique elements in a new array.
```javascript
var l = arr.reduce((unique, item) => {
  if (!unique.includes(item)) unique.push(item);
  return unique;
}, []);
```

**Benchmark Preparation Code**

The provided HTML preparation code includes a script tag that loads the Lodash library, making its functions available for use in the benchmark.

Overall, this benchmark provides a clear and concise way to compare two approaches to removing duplicates from an array, helping developers understand the performance implications of each method.

Related benchmarks:

lodash uniq vs filter (version: 0)

Comparing performance of: Filter vs Array

Created: 2 years ago by: Guest

Jump to the latest result

Filter

Array

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):