Benchmark: another one slice vs splice

Script Preparation code:

var list = [];
for (var i = 0; i < 1000; i++) {
  list.push({index: i, content: i.toString()});
}

Tests:

splice
function removeByIndex(arr, index) { const nextArr = [...arr]; nextArr.splice(index, 1); return nextArr; } removeByIndex(list, 800);
slice
function removeByIndex(arr, index) { return [...arr.slice(0, index), ...arr.slice(index + 1)] } removeByIndex(list, 800);

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:

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in this JavaScript benchmark.

**Benchmark Overview**

The benchmark measures the performance of two different approaches to remove an element from an array: `splice` and `slice`. The test case creates an array of 1000 elements, then removes the middle element (index 800) using both methods.

**Options Compared**

Two options are compared:

1. **Splice**: This method modifies the original array by removing the specified index and returns a new array with the removed element.
2. **Slice**: This method creates a shallow copy of the array from the beginning up to the specified index, then creates another shallow copy from the index + 1 to the end, effectively removing the middle element.

**Pros and Cons**

* **Splice**: Pros:
	+ Modifies the original array in-place.
	+ Can be faster for large arrays since it doesn't create multiple copies.
* Cons:
	+ Returns a new array, which can lead to increased memory usage.
	+ May be slower than `slice` due to the overhead of modifying an array.
* **Slice**: Pros:
	+ Creates a shallow copy of the original array, preserving its structure and relationships.
	+ Can be faster for large arrays since it doesn't modify the original array.
* Cons:
	+ Creates multiple copies of the array, leading to increased memory usage.
	+ May be slower than `splice` due to the overhead of creating new arrays.

**Library Usage**

In this benchmark, no libraries are explicitly mentioned. However, it's likely that the `Array.prototype.slice()` method is used internally by JavaScript engines or the `splice()` method modifies the array in-place without returning a new one.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. It only uses standard JavaScript methods and features.

**Other Alternatives**

If you're interested in alternative approaches to removing elements from an array, consider:

* Using `Array.prototype.filter()` to create a new array with the desired element removed.
* Using `Array.prototype.map()` to transform the original array and remove the middle element.
* Using a library like Lodash's `remove` function, which provides a more efficient and convenient way to remove elements from an array.

Overall, this benchmark is designed to measure the performance of two common array manipulation techniques: `splice` and `slice`. By comparing these approaches, users can gain insight into the trade-offs between memory usage and execution speed.

Related benchmarks:

another one slice vs splice (version: 1)

Comparing performance of: splice vs slice

Created: 5 years ago by: Registered User

Jump to the latest result

splice

slice

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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