Benchmark: slice VS splice 500k entries from 1m entries

Script Preparation code:

var list = [];
for (var i = 0; i < 1_000_000; i++) {
  list.push(i);
}

Tests:

slice
list.push('slice'); list = list.slice(250_000, 750_000);
splice
list.push('splice'); list.splice(250_000, 500_000);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
splice

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.

Measuring the performance of JavaScript microbenchmarks can be a fascinating task, and I'm happy to help you understand what's being tested in this benchmark.

**Overview**

The benchmark is designed to compare the performance of two approaches: using `Array.prototype.slice()` and `Array.prototype.splice()`. The goal is to measure how fast each approach can remove 250,000 elements from an array containing 1,000,000 random integers.

**Options being compared**

There are two options being tested:

1. **`slice()`**: This method creates a shallow copy of the specified range elements and returns it as a new array.
2. **`splice()``: This method removes elements at the specified start and end indices from the array.

**Pros and Cons of each approach:**

* `slice()`
	+ Pros:
		- Creates a shallow copy, which can be faster than modifying the original array.
		- Allows for more control over the result (e.g., you can specify the length of the new array).
	+ Cons:
		- Can be slower due to the overhead of creating a new array.
* `splice()`
	+ Pros:
		- Modifies the original array, which can be faster since it avoids creating a new array.
		- More concise and expressive syntax.
	+ Cons:
		- Can be slower than `slice()` for large arrays because it modifies the original array.

**Other considerations:**

* **Performance**: Both approaches have their trade-offs in terms of performance. `splice()` is likely to be faster for small to medium-sized arrays, but `slice()` can be faster for larger arrays.
* **Memory usage**: Using `splice()` can lead to increased memory usage since it modifies the original array, while using `slice()` creates a new array that does not affect the original.

**Library and syntax**

There are no libraries being used in this benchmark. The code is written in plain JavaScript.

**Special JS features or syntax (none)**

No special JavaScript features or syntax are being tested in this benchmark.

**Other alternatives:**

If you were to add more alternatives, some possible approaches could be:

* Using `Array.prototype.filter()` to remove elements from the array.
* Using a custom implementation of an iterator or generator to avoid modifying the original array.
* Using a library like Lodash's `chunk` function to split the array into smaller chunks.

Keep in mind that each alternative approach would have its own set of trade-offs and considerations, and the best choice would depend on the specific use case and requirements.

Related benchmarks:

slice VS splice 500k entries from 1m entries (version: 0)

Comparing performance of: slice vs splice

Created: 5 years ago by: Guest

Jump to the latest result

slice

splice

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):