Benchmark: Slice vs Splice delete 1000

Script Preparation code:

var array = Array.from({ length: 10000 }).map((val, i) => i);

Tests:

Splice
var messages = array.slice().splice(9999, 1);
Slice
var messages = array.slice().slice(0, 9999);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
Slice

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser/OS: Firefox 140 on Linux

View result in a separate tab

Test name	Executions per second
Splice	243790.4 Ops/sec
Slice	123267.0 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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of two different methods for deleting elements from an array: `splice` and `slice`. The goal is to measure which method is faster when deleting a large number of elements at a specific index.

**Script Preparation Code**

The script preparation code creates an array with 10,000 elements using `Array.from()` and then maps over it to assign each element a unique index value. This creates an array where each element has a known position in the array.

**Options being Compared**

Two options are being compared:

1. **Splice**: Using `splice()` to delete the last element at index 9999.
2. **Slice**: Using `slice()` to get a subset of elements from the original array, excluding the last element at index 9999.

**Pros and Cons of Each Approach**

* **Splice**:
	+ Pros: Can be more efficient if you need to delete multiple elements at once or insert/delete elements in place.
	+ Cons: Can be slower for small arrays due to the overhead of updating the internal array structure. Also, it modifies the original array.
* **Slice**:
	+ Pros: Creates a new array object with the desired subset of elements, leaving the original array unchanged.
	+ Cons: Can be slower for large arrays because creating a new array can be expensive in terms of memory allocation and copying.

**Library Used**

In this benchmark, no library is explicitly mentioned. However, it's worth noting that both `splice()` and `slice()` are part of the built-in JavaScript API.

**Special JS Feature or Syntax**

There isn't any special JavaScript feature or syntax being used in this benchmark. It's a straightforward example of comparing two common array manipulation techniques.

**Other Considerations**

* The benchmark is designed to run on a specific device platform (Desktop) and operating system (Mac OS X 10.13.6), which may impact the results.
* The number of executions per second for each test case can give us an idea of which method is faster in terms of performance.

**Alternative Approaches**

There are other ways to delete elements from an array, such as:

1. **Array.prototype.filter()**: Creates a new array with all elements that pass the test implemented by the provided function.
2. **Array.prototype.map()`: Creates a new array populated with the results of calling a provided function on every element in the original array.

However, these methods are not being tested in this benchmark.

I hope this explanation helps you understand what's being measured in this benchmark!

Related benchmarks:

Slice vs Splice delete 1000 (version: 0)

Comparing performance of: Splice vs Slice

Created: 7 years ago by: Guest

Jump to the latest result

Splice

Slice

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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