Benchmark: find index with splice vs filter

HTML Preparation code:

<script>
  var array = [
	{
		color: "red",
		value: "#f00"
	},
	{
		color: "green",
		value: "#0f0"
	},
	{
		color: "blue",
		value: "#00f"
	},
	{
		color: "cyan",
		value: "#0ff"
	},
	{
		color: "magenta",
		value: "#f0f"
	},
	{
		color: "yellow",
		value: "#ff0"
	},
	{
		color: "black",
		value: "#000"
	}
]
</script>

Script Preparation code:

function deleteByFilter (array, element) {
  array = array.filter( el => el !== element );
}

function deleteBySplice (array, element) {
  var index = array.findIndex((item) => item.color === element);
  if (index !== -1) {
  	array.splice( index, 1 );
  }
}

Tests:

findIndex and splice test
deleteBySplice(array, 'black') deleteBySplice(array, 'blue')
filter test
deleteByFilter(array, 'black') deleteByFilter(array, 'blue')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
findIndex and splice test
filter test

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing two approaches to remove elements from an array:

1. `deleteBySplice(array, element)`
2. `deleteByFilter(array, element)`

Both functions take an array and an element as input and modify the array in-place by removing all occurrences of that element.

**Functions Explanation**

### deleteBySplice

This function uses the `splice()` method to remove elements from the array. It finds the index of the first occurrence of the specified element using `findIndex()`, then removes the element at that index (and all subsequent elements) using `splice()`. This approach modifies the original array.

Pros:

* Simple and efficient, as it directly uses built-in methods.
* Works well for small to medium-sized arrays.

Cons:

* May not be suitable for large arrays due to performance issues with `findIndex()` and `splice()`.
* Does not preserve the original order of elements.

### deleteByFilter

This function uses the `filter()` method to remove elements from the array. It creates a new array that includes only the elements that do not match the specified element, effectively removing all occurrences of that element. This approach does not modify the original array.

Pros:

* Suitable for large arrays, as it uses a more efficient algorithm.
* Preserves the original order of elements.

Cons:

* May have additional overhead due to creating a new array and using `filter()`.
* Returns a new array instead of modifying the original one.

**Library/Function Used**

In this benchmark, `filter()` is used in both `deleteByFilter` and as part of the `array.filter()` method in the `Html Preparation Code`. The `findIndex()` method is also used in `deleteBySplice`.

The `splice()` method is a native JavaScript function.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. Both approaches use standard array methods and do not rely on any advanced features.

**Other Alternatives**

Alternative approaches to remove elements from an array could include:

1. Using `forEach()` with a callback function that removes the element.
2. Using `map()` to create a new array with only the desired elements.
3. Using `reduce()` to accumulate the filtered elements in an accumulator array.
4. Using a library like Lodash or Ramda for more functional programming approaches.

However, these alternatives might not be as efficient or straightforward as using `filter()` and `splice()`, which are both native JavaScript methods.

Related benchmarks:

find index with splice vs filter (version: 0)

Comparing performance of: findIndex and splice test vs filter test

Created: 3 years ago by: Guest

Jump to the latest result

findIndex and splice test

filter test

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):