Benchmark: Array.toSpliced vs Array.filter

HTML Preparation code:

<script>
  const array = ["first","second","third","asdawd","cxzcas","ljjjln","dfh93fsad9","asdfeh5","dsag442","gdsgds","fdsfrhdgr"];
</script>

Script Preparation code:

function spliceIt(array, elementIdx){
  array.toSpliced(elementIdx, 1);
}

function filterIt(array, elementIdx){
  array = array.filter((el, idx) => idx !== elementIdx);
}

Tests:

ToSpliced It
spliceIt(array, 5);
filter It
filterIt(array, 5);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ToSpliced It
filter It

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
ToSpliced It	21196440.0 Ops/sec
filter It	33667412.0 Ops/sec

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 definition and test cases.

**What is being tested?**

The benchmark measures the performance difference between two approaches to remove an element from an array: `Array.prototype.toSpliced()` and `Array.prototype.filter()`. The test case compares these two methods when removing a specific element at index 5 from the provided array.

**Options compared:**

1. `Array.prototype.toSpliced(elementIdx, 1)`: This method modifies the original array by replacing the element at the specified index with the element at the next index.
2. `array.filter((el, idx) => idx !== elementIdx)`: This method returns a new array containing all elements except the one at the specified index.

**Pros and Cons:**

1. **toSpliced()**: Advantages:
	* Can be faster for small arrays or arrays with few elements.
	* May be more efficient since it doesn't create a new array.
	Disadvantages:
		+ Modifies the original array, which can be unexpected behavior in some cases.
		+ Requires an index to specify the element to remove, which can be inconvenient if you want to remove multiple elements.
2. `filter()``: Advantages:
	* Creates a new array, which can help avoid side effects on the original data.
	* Can be more readable and maintainable since it explicitly states what operation is being performed.
Disadvantages:
	* May be slower for large arrays due to the overhead of creating a new array.
		+ Requires creating an intermediate function or expression to specify the element to remove, which can add complexity.

**Library/Functions:**

In this benchmark, there are no explicit libraries or functions used other than the built-in JavaScript methods `Array.prototype.toSpliced()` and `Array.prototype.filter()`. However, it's worth noting that some browsers may have additional features or polyfills for these methods.

**Special JS feature/Syntax:**

There is no special JavaScript feature or syntax being tested in this benchmark. It only focuses on the performance difference between two array manipulation methods.

**Other alternatives:**

If you're looking for alternative ways to remove an element from an array, some other approaches include:

1. Using `Array.prototype.indexOf()` and slicing the array.
2. Using `Array.prototype.slice()` with a negative index.
3. Using `Array.prototype.splice()` with an offset of 0.

However, these alternatives may have different trade-offs in terms of performance, readability, or memory usage, depending on the specific use case.

Keep in mind that the choice of method ultimately depends on your personal preference, the specific requirements of your project, and any potential constraints such as browser support or performance considerations.

Related benchmarks:

Array.toSpliced vs Array.filter (version: 0)

Test a speed difference between these 2 approaches

Comparing performance of: ToSpliced It vs filter It

Created: 2 years ago by: Guest

Jump to the latest result

ToSpliced It

filter It

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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