Benchmark: FindIndex + splice vs filter(2)

Script Preparation code:

var arr = new Array(1000);
arr.fill({ id: 0 });
arr = arr.map((el, idx) => el.id = idx);
var foo = Math.floor(Math.random() * 1000);

Tests:

FindIndex + splice
var index = arr.indexOf(foo); var newArr = arr.splice(index, 1);
filter
var index = arr.filter(el => el !== foo)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
FindIndex + splice
filter

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 what's being tested in the provided JSON.

**Benchmark Definition**

The benchmark is designed to compare two approaches for removing an element from an array:

1. **FindIndex + splice**: This approach uses `Array.prototype.indexOf()` to find the index of the element to be removed, and then uses `Array.prototype.splice()` to remove that element.
2. **filter**: This approach uses `Array.prototype.filter()` to create a new array with all elements that are not equal to the target value (`foo`).

**Options Compared**

The benchmark is comparing these two approaches:

* FindIndex + splice
* filter

**Pros and Cons of Each Approach**

1. **FindIndex + splice**:
	* Pros: This approach can be more efficient if you need to remove multiple elements from an array, as it modifies the original array in place.
	* Cons: If you're only removing one element, this approach is likely to be slower than filter because it involves searching for the element and then modifying the array.
2. **filter**:
	* Pros: This approach creates a new array with the filtered elements, leaving the original array unchanged. It's also more memory-efficient if you have large arrays.
	* Cons: Creating a new array can be slower than modifying an existing one.

**Library**

Neither of these approaches uses any external libraries. The `filter()` method is a built-in method of the Array prototype in JavaScript.

**Special JS Feature or Syntax**

There are no special features or syntax being tested here. These examples use standard JavaScript syntax and should be compatible with most JavaScript environments.

**Other Alternatives**

If you need to remove elements from an array, other approaches might include:

* Using a loop to iterate over the array and manually incrementing the `length` property of the array
* Using `Array.prototype.reduce()` or `Array.prototype.forEach()` to iterate over the array and filter out unwanted elements

However, these alternatives are generally less efficient than using built-in methods like `filter()` or modifying an array in place.

**Benchmark Preparation Code**

The preparation code creates a large array (`arr`) with 1000 elements, each containing an object with an `id` property. The array is then filled with random values, and a specific value (`foo`) is randomly selected from the range 0-999.

**Individual Test Cases**

There are two test cases:

1. **FindIndex + splice**: This test case uses the FindIndex + splice approach to remove an element from the array.
2. **filter**: This test case uses the filter approach to create a new array with all elements that are not equal to `foo`.

**Latest Benchmark Result**

The latest result shows the execution count per second for both test cases on a Chrome 111 browser running on Linux, using the provided preparation code and HTML content. The results suggest that the filter approach is slightly faster than the FindIndex + splice approach.

Related benchmarks:

FindIndex + splice vs filter(2) (version: 0)

Comparing performance of: FindIndex + splice vs filter

Created: 3 years ago by: Guest

Jump to the latest result

FindIndex + splice

filter

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):