Benchmark: Splice vs [...] - MeasureThat.net

Script Preparation code:

var array = Array(100).map((el, index) => index);

Tests:

splice
let i = 10000; while(i>0) { const t1 = array.splice() i--; }
deconstruct
let i = 10000; while(i>0) { const t1 = [...array]; i--; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice
deconstruct

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0

Browser/OS: Firefox 80 on Windows

View result in a separate tab

Test name	Executions per second
splice	853.6 Ops/sec
deconstruct	108.3 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**What is tested:**

The provided benchmark tests two different approaches to removing elements from an array in JavaScript:

1. **Splice**: This method modifies the original array by removing the specified element(s) at a given index(es). The `splice()` function returns the removed elements as an array.
2. **Deconstruction** (also known as destructuring assignment): This method creates a new array containing the same elements as the original array, without modifying it.

The benchmark measures the performance of these two approaches in terms of how many executions per second on a given test case with a large array of 100 elements.

**Options compared:**

* **Splice**: modifies the original array
	+ Pros:
		- Modifies the original array in place, which can be more efficient for larger arrays.
		- Returns the removed elements as an array, which can be useful for further processing.
	+ Cons:
		- Can modify the original array unexpectedly if not handled properly.
		- May have performance implications due to array modification.
* **Deconstruction** (Destructuring assignment):
	+ Pros:
		- Does not modify the original array, keeping it in a consistent state.
		- Creates a new array without modifying the original one, which can be more predictable.
	+ Cons:
		- Requires creating a new array, which can have performance implications for large arrays.

**Other considerations:**

* **Array modification**: Both approaches modify the array in some way. However, splice modifies the original array, while deconstruction creates a new array without modifying it.
* **Performance overhead**: Deconstruction may incur a higher performance overhead due to the creation of a new array, especially for large arrays.
* **Predictability and consistency**: Deconstruction is generally more predictable and consistent since it does not modify the original array.

**Library usage:**

None of the test cases uses any external libraries. Both approaches use built-in JavaScript methods: `splice()` and destructuring assignment.

**Special JS feature or syntax:**

The benchmark uses a simple example that demonstrates the basic behavior of both approaches. There are no special features or syntax used, such as async/await, classes, or functional programming concepts.

**Other alternatives:**

If you want to test other approaches for removing elements from an array in JavaScript, some alternatives could include:

* Using `filter()` method with a callback function
* Using `map()` method with a callback function and then using `slice()` to remove elements
* Using a library like Lodash or Ramda, which provide various utility functions for working with arrays.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the approaches tested in this benchmark.

Related benchmarks:

Splice vs [...] (version: 0)

Comparing performance of: splice vs deconstruct

Created: 4 years ago by: Guest

Jump to the latest result

splice

deconstruct

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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