Benchmark: array indexOf with splice vs filter

Script Preparation code:


var arr = ['abc', 'xyz', 'ghi', 'klm']

Tests:

filter
arr.filter((item) => { return item !== 'ghi'; });
indexOf
arr.splice(arr.indexOf('ghi'), 1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
filter
indexOf

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 23 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark measures the performance of two different approaches to remove an element from an array:

1. **filter**: The `filter` method creates a new array with all elements that pass a test implemented by a user-provided function.
2. **indexOf + splice**: This approach uses the `indexOf` method to find the index of the element to be removed, and then calls `splice` to remove it.

**Options Compared**

The benchmark compares two options:

* **filter**: Creates a new array with elements that don't match the filter condition.
* **indexOf + splice**: Removes the element at the specified index from the original array.

**Pros and Cons**

**Filter (arr.filter)**

Pros:

* More efficient than modifying the original array, as it creates a new array without affecting the original data.
* Can be more predictable in terms of performance, as it avoids the overhead of finding an index.

Cons:

* May require more memory, depending on the size of the filtered array.
* Can be slower for very large datasets due to the creation of a new array.

**indexOf + splice**

Pros:

* Modifies the original array, which may be beneficial in certain scenarios where data needs to be updated in-place.
* Can be faster for small arrays or datasets, as it avoids the overhead of creating a new array.

Cons:

* Modifies the original array, which can lead to unintended side effects if not carefully managed.
* May be slower due to the overhead of finding an index and then removing an element.

**Library**

In this benchmark, no specific library is mentioned. The `filter` method is a built-in JavaScript function.

**Special JS Feature or Syntax**

None are mentioned in this benchmark.

Now, let's discuss other alternatives:

* **Array.prototype.map**: While not directly relevant to this benchmark, `map` can be used to create a new array by applying a transformation function to each element. However, it would require additional processing steps and may not be as efficient as the filter method.
* **Array.prototype.forEach**: Similar to `filter`, but with the added overhead of iterating over the entire array. This approach is less suitable for this benchmark.

**Alternatives**

Some alternative approaches could include:

* Using a custom function or algorithm to find the index of the element to be removed, instead of relying on the `indexOf` method.
* Using other array methods, such as `forEach` or `reduce`, to achieve the same result as the filter and `indexOf + splice` approaches.

However, these alternatives may not provide significant performance improvements over the existing options, and may introduce additional complexity or overhead.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36 Edg/102.0.1245.39

Browser/OS: Chrome 102 on Windows

View result in a separate tab

Test name	Executions per second
filter	5528543.0 Ops/sec
indexOf	3186130.5 Ops/sec

Related benchmarks:

array indexOf with splice vs filter (version: 0)

Comparing performance of: filter vs indexOf

Created: 5 years ago by: Guest

Jump to the latest result

filter

indexOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 23 days ago):