Let's break down the benchmark and explain what's being tested.

Benchmark Overview

The benchmark compares two approaches to delete elements from an array: using filter() method and using splice() method with indexOf(). The goal is to determine which approach is faster.

Options Being Compared

There are two options being compared:

1. Filter Method: This involves creating a new array with only the elements that do not match the filter criteria.
2. Splice Method with indexOf(): This involves iterating over the array and using indexOf() to find the index of each element to be deleted, then using splice() to remove the element at that index.

Pros and Cons

Here are some pros and cons of each approach:

1. Filter Method:
   • Pros: Efficient, as it only requires iterating over the array once.
   • Cons: Creates a new array, which can be memory-intensive for large arrays.
2. Splice Method with indexOf():
   • Pros: Does not create a new array, so it's more memory-efficient for large arrays.
   • Cons: Requires iterating over the array multiple times to find all elements to delete.

Library and Special JS Features

In this benchmark, the filter() method is used as a built-in JavaScript function. There are no external libraries or special JS features being tested.

Other Considerations

Another approach that could be considered for deleting elements from an array is using map() followed by splice(), like this:

array = array.map(item => item === toFilter[0] ? undefined : item);
array.splice(0, array.length - (array.filter(x => x !== undefined).length));

However, this approach has the same issue as the filter method: it creates a new array.

Alternatives

Some other approaches that could be considered for deleting elements from an array include:

1. Using forEach(): Similar to the splice method, but with forEach(), you would need to call thisArg and keep track of indices separately.
2. Using reduce(): Another way to remove elements from an array is by using reduce() with a callback function that removes elements based on a condition.
3. Using Array.prototype.forEach() and indexOf() in combination: Instead of using splice(), you could use forEach() and indexOf() together to achieve similar results.

Keep in mind that these alternatives may have varying performance characteristics, and the benchmark would need to be adjusted accordingly to test them effectively.