Benchmark: Subarray - Splice vs Slice

Script Preparation code:

var list = [];
for (var i = 0; i < 1000 * 1000; i++) {
  list.push(i);
}

Tests:

Slice
list.slice(3, 993);
Splice
list.splice(3, 990);

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:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark, titled "Subarray - Splice vs Slice", measures the performance of two JavaScript methods: `slice()` and `splice()`. The test creates an array with 1 million elements and then performs the following operations:

1. **Script Preparation Code**: An empty array `list` is created using `var list = []`, and then a loop runs 1 million times, pushing each number from 0 to 999,999 into the array using `list.push(i)`.
2. **Html Preparation Code**: There is no HTML preparation code provided.
3. **Individual Test Cases**: The benchmark consists of two test cases:
	* **Slice**: Creates a new array containing every third element of the original array using `list.slice(3, 993)`.
	* **Splice**: Removes all elements from the array between the third and 993rd positions (inclusive) using `list.splice(3, 990)`.

**Comparison**

The benchmark compares the performance of these two methods:

1. **Slice()**: Returns a shallow copy of a portion of an array.
2. **Splice()**: Modifies the original array by removing elements at the specified range and returns the removed elements.

**Pros and Cons**

* **Slice():**
	+ Pros:
		- Creates a new array with a subset of elements, which can be more memory-efficient for large datasets.
		- Does not modify the original array.
	+ Cons:
		- May have slower performance due to creating a new array object.
* **Splice():**
	+ Pros:
		- Modifies the original array in-place, which can lead to better performance.
		- Returns the removed elements.
	+ Cons:
		- Modifies the original array, which might be undesirable for some use cases.
		- Can be slower due to the overhead of modifying the array.

**Library and Special JS Feature**

There are no external libraries used in this benchmark. However, it does utilize JavaScript's built-in `slice()` and `splice()` methods.

**Test Users Special JS Feature or Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark.

**Other Alternatives**

If you're looking for alternative ways to create a subset of an array without using `slice()`:

1. **Array.prototype.slice.call()**: This method creates a new array from the given arguments, but it's not as efficient as `slice()`.
2. **Array.prototype.slice.apply()`: Similar to `slice.call()`, but it uses `apply()` instead.
3. **Array.prototype.slice() with offset and length**: You can use `list.slice(startIndex, endIndex)` to create a subset of the array.

Keep in mind that these alternatives might have different performance characteristics compared to using `slice()`.

Related benchmarks:

Subarray - Splice vs Slice (version: 0)

Comparing performance of: Slice vs Splice

Created: 7 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):