Benchmark: Array.splice with indexOf 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, value){
  array.splice(array.indexOf(value), 1);
}

function filterIt(array, value){
  array = array.filter((el) => el !== value);
}

Tests:

Splice It
spliceIt(array, 'cxzcas');
filter It
filterIt(array, 'cxzcas');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice 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
Splice It	41725624.0 Ops/sec
filter It	83298848.0 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 options being compared.

**What is being tested?**

The benchmark tests two approaches to remove an element from an array in JavaScript:

1. `Array.splice(array, array.indexOf(value))`: This method finds the index of the specified value in the array using `indexOf()`, then removes the element at that index.
2. `Array.filter((el) => el !== value)`: This method uses a callback function to filter out elements that match the specified value.

**Options being compared**

The two approaches are being compared in terms of performance, specifically the speed difference between them.

**Pros and Cons of each approach:**

1. **`Array.splice(array, array.indexOf(value))`**:
	* Pros:
		+ Simple and straightforward implementation.
		+ Works for most use cases where you need to remove a single element.
	* Cons:
		+ Can be slow if the index is not found or if the array is large.
		+ Modifies the original array, which can be undesirable in some scenarios.
2. **`Array.filter((el) => el !== value)`**:
	* Pros:
		+ Efficient for large arrays since it only iterates over elements that match the condition.
		+ Does not modify the original array.
	* Cons:
		+ Requires creating a new array, which can be memory-intensive.
		+ May have performance overhead due to the filtering operation.

**Library and syntax considerations**

There are no libraries explicitly mentioned in the benchmark definition. However, `Array.prototype.indexOf()` is a built-in method that uses a linear search algorithm. The `filter()` method also uses a similar approach, iterating over elements in the array.

No special JavaScript features or syntax are used in this benchmark.

**Other alternatives**

Some alternative approaches to remove an element from an array include:

1. Using `Array.prototype.map()` and then concatenating the result with another array containing all other elements.
2. Using `reduce()` and accumulating the remaining elements in a new array.
3. Using `slice()` and concatenating two arrays: one for removed elements and another for kept elements.

These alternatives may have different trade-offs in terms of performance, memory usage, and code complexity compared to the two approaches being tested.

**Benchmark preparation code**

The provided script preparation code defines two functions:

* `spliceIt(array, value)`: Splices the specified value from the array using `indexOf()`.
* `filterIt(array, value)`: Filters out the specified value from the array using a callback function.

These functions are then called with different inputs to test their performance.

Related benchmarks:

Array.splice with indexOf vs Array.filter (version: 0)

Test a speed difference between these 2 approaches

Comparing performance of: Splice It vs filter It

Created: 3 years ago by: Guest

Jump to the latest result

Splice 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):