Benchmark: arrayFilter vs arraySet for unique Array

Script Preparation code:

var myArray = ['c', 'b', 'c', 2, 'b'];

function arrayFilter (array) {
	return array.filter((value, index, self) => self.indexOf(value) === index)
}

function arraySet(array) {
	return [...new Set(array)];  
}

Tests:

arrayFilter
arrayFilter(myArray)
arraySet
arraySet(myArray)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
arrayFilter
arraySet

Fastest: N/A

Slowest: N/A

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

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I'll break down the provided benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark is designed to compare two approaches for creating an array of unique values: using `arrayFilter` or `arraySet`.

**Script Preparation Code**

The script preparation code defines two functions:

1. `arrayFilter`: This function uses the `filter()` method with a callback function that checks if the value at the current index (`index`) is not present in the original array (`self.indexOf(value) === index`). If true, it includes the value in the new array.
2. `arraySet`: This function uses the spread operator (`...`) to create a new array containing unique values from the original array by passing it to the `Set()` constructor.

**Options Compared**

Two options are being compared:

1. **`arrayFilter`**: Uses the `filter()` method with a custom callback function.
2. **`arraySet`**: Uses the spread operator (`...`) and the `Set()` constructor.

**Pros and Cons**

**Array Filter**

Pros:

* Can handle array elements that have no unique index (e.g., arrays of strings).
* More flexible, as it allows for additional processing on each element before including it in the new array.
* Native implementation in most browsers.

Cons:

* May incur additional overhead due to the filtering operation.
* Can be slower for larger arrays since `indexOf()` has a linear search complexity (O(n)).

**Array Set**

Pros:

* Fast and efficient, as it uses a hash table data structure internally (O(1) lookup time).
* Can handle large arrays without significant performance degradation.

Cons:

* Requires JavaScript version 1.8 or later to support `Set` objects.
* May not work in older browsers that don't support modern array methods.
* Creates a new object, which can be memory-intensive for very large arrays.

**Library and Purpose**

The `Set` library is used by the `arraySet` function. It provides an efficient way to store unique values and check their presence in O(1) time.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. However, it's worth noting that the use of `Set` objects requires modern JavaScript versions (1.8+) and may not work in older browsers.

**Other Alternatives**

If you wanted to compare other approaches for creating an array of unique values, some alternatives could include:

* Using a `Map` object to store indices as keys.
* Implementing a custom data structure, such as a trie or a balanced binary search tree.
* Utilizing a third-party library that provides efficient set operations.

Keep in mind that each alternative would have its own pros and cons, depending on the specific use case and requirements.

Related benchmarks:

arrayFilter vs arraySet for unique Array (version: 0)

Comparing performance of: arrayFilter vs arraySet

Created: 4 years ago by: Guest

Jump to the latest result

arrayFilter

arraySet

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):