Benchmark: Filter unique, Set vs filter()

Script Preparation code:

function filterUniq(arr){
	return arr.filter((i,p)=>{
      return arr.indexOf(i) == p
    }); 
}
function setUniq(arr){
	return [...new Set(arr)] 
}
var a = [1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5]

Tests:

Filter
var b = filterUniq(a)
Set
var b = setUniq(a)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Filter
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 break down the provided JSON data and explain what is tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition is a JavaScript function that creates an array `a` with duplicate elements, and then defines two functions: `filterUniq()` and `setUniq()`. The purpose of these functions is to remove duplicates from the array. `filterUniq()` uses the `indexOf()` method to check if an element is already present in the array, while `setUniq()` uses the `Set` object to store unique elements.

**Options Compared**

The two options compared are:

1. **Filtering using `indexOf()`**: This approach uses the `indexOf()` method to check if an element is already present in the array.
2. **Using a `Set` object**: This approach uses the `Set` object to store unique elements, which automatically removes duplicates.

**Pros and Cons of Each Approach**

1. **Filtering using `indexOf()`**:
	* Pros:
		+ Simple and easy to understand
		+ Works well for small arrays
	* Cons:
		+ Has a time complexity of O(n), making it slower for large arrays
		+ Can lead to performance issues if the array is very large
2. **Using a `Set` object**:
	* Pros:
		+ Faster than filtering using `indexOf()` (O(1) time complexity)
		+ More efficient for large arrays
	* Cons:
		+ May not be as intuitive or easy to understand, especially for those new to JavaScript
		+ Requires the use of a library or built-in function that may not be available in older browsers

**Other Considerations**

* **Library usage**: The benchmark uses the `Set` object, which is a built-in JavaScript object. However, if you wanted to test a custom implementation using a library like Lodash or Ramda, it would add an extra layer of complexity.
* **Special JS feature/syntax**: There are no special features or syntax used in this benchmark.

**Alternatives**

If you wanted to compare other approaches for removing duplicates from an array, some alternatives could include:

1. Using the `Map` object (O(1) time complexity)
2. Implementing a custom solution using recursion or iteration
3. Using a library like Lodash's `uniq()` function

Keep in mind that each approach has its own trade-offs and considerations, and the best choice depends on your specific use case and requirements.

Related benchmarks:

Filter unique, Set vs filter() (version: 0)

Comparing performance of: Filter vs Set

Created: 7 years ago by: Guest

Jump to the latest result

Filter

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):