Benchmark: splice vs filter (delete from array)

Script Preparation code:

var arr = []
for (i = 0; i < 100; i++) {
    arr.push({})
}

var item = arr[arr.length / 2]

Tests:

findIndex, splice
const newArr = Object.create(arr) newArr.splice( newArr.findIndex(i => i === item), 1)
filter
const newArr = Object.create(arr) newArr.filter(i => i !== item)
indexOf, splice
const newArr = Object.create(arr) newArr.splice( newArr.indexOf(item), 1)
indexOf, splice, check
const newArr = Object.create(arr) const index = newArr.indexOf(item) if (index !== -1) { newArr.splice(index, 1) }
for, splice
const newArr = Object.create(arr) for (i = 0; i < newArr.length; i++) { if (newArr[i] === item) { newArr.splice(i, 1) break } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
findIndex, splice
filter
indexOf, splice
indexOf, splice, check
for, splice

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
findIndex, splice	348938.2 Ops/sec
filter	180772.8 Ops/sec
indexOf, splice	609762.2 Ops/sec
indexOf, splice, check	539156.6 Ops/sec
for, splice	292076.8 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark defines two methods for removing an element from an array: `splice` and `filter`. The test aims to compare these two approaches in terms of performance, specifically execution speed.

**Test Cases**

There are four test cases:

1. **findIndex, splice**: This test case uses the `findIndex` method to locate the index of the item to be removed, and then calls `splice` to remove the element at that index.
2. **filter**: This test case uses the `filter` method to create a new array with all elements except the one at the specified index.
3. **indexOf, splice**: Similar to the first test case, but uses the `indexOf` method instead of `findIndex`.
4. **indexOf, splice, check**: This test case adds an additional step by checking if the item was successfully removed using the `indexOf` method before calling `splice`.

**Library and Purpose**

The `Object.create()` method is used to create a new object that inherits from the original array (`arr`). The purpose of this is to ensure that each test case starts with a fresh, empty array.

No other libraries are explicitly mentioned in the benchmark definition or test cases.

**Special JavaScript Features**

None of the test cases use any special JavaScript features like ES6 modules, async/await, or modern syntax. They all follow traditional JavaScript syntax.

**Options Compared**

The four test cases compare different approaches to removing an element from an array:

* **splice**: Removes the element at a specified index.
* **filter**: Creates a new array with all elements except the one at the specified index.

Each test case evaluates which approach is faster.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

* **splice**:
	+ Pros: Efficient, simple to use, and widely supported.
	+ Cons: Can be slow for large arrays if many elements need to be removed.
* **filter**:
	+ Pros: More efficient than `splice` when only one element needs to be removed, as it creates a new array with the desired elements.
	+ Cons: Requires creating a new array, which can be memory-intensive.

**Other Considerations**

When choosing between `splice` and `filter`, consider the following:

* If you need to remove multiple elements from an array, `splice` might be faster than `filter`.
* If only one element needs to be removed, `filter` might be more efficient.
* Be mindful of memory usage when using `filter`, as it creates a new array.

**Alternatives**

Other approaches to removing an element from an array include:

* Using the `slice()` method to create a new array with all elements except the one at the specified index.
* Using the `map()` method in combination with `indexOf` and `slice()` to achieve similar results.
* Using a custom implementation using indexing or iteration.

Keep in mind that these alternatives might have different performance characteristics and use cases compared to the `splice` and `filter` methods.

Related benchmarks:

splice vs filter (delete from array) (version: 39)

Comparison of "splice" and "filter" methods for removing an element from an array.

Comparing performance of: findIndex, splice vs filter vs indexOf, splice vs indexOf, splice, check vs for, splice

Created: one year ago by: Registered User

Jump to the latest result

findIndex, splice

filter

indexOf, splice

indexOf, splice, check

for, splice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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