Benchmark: Split vs slice vs Splice javascript

Script Preparation code:

var array = new Array(100).map(a => ({
    a: 'b',
    b: 'c',
    d: 'e'
}))

Tests:

Slice
array = array.slice(1)
Splice
array.splice(0,1)
Shift
array.shift()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Slice
Splice
Shift

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:132.0) Gecko/20100101 Firefox/132.0

Browser/OS: Firefox 132 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Slice	51003776.0 Ops/sec
Splice	45565644.0 Ops/sec
Shift	269587232.0 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 Definition**

The provided JSON represents a JavaScript microbenchmark that compares three different approaches to remove elements from an array: `slice`, `splice`, and `shift`. The benchmark is designed to measure which approach is most efficient.

**Options Compared**

* `Slice`: uses the `Array.prototype.slice()` method to create a new array with the desired elements.
* `Splice`: uses the `Array.prototype.splice()` method to remove elements from the original array.
* `Shift`: uses the `Array.prototype.shift()` method to remove the first element from the original array.

**Pros and Cons of Each Approach**

1. **Slice**
	* Pros: creates a new array with the desired elements, doesn't modify the original array, can be more predictable in terms of performance due to cache locality.
	* Cons: requires additional memory allocation and copying of elements, which can lead to slower performance for large arrays.
2. **Splice**
	* Pros: modifies the original array, can be faster than `slice` since it doesn't require additional memory allocation.
	* Cons: modifies the original array, which may not be desirable in some cases; can be slower due to the need to update indices and cache.
3. **Shift**
	* Pros: removes elements from the beginning of the array, which can be beneficial for certain use cases (e.g., removing oldest items in a queue).
	* Cons: modifies the original array, has limited control over which elements are removed; can lead to slower performance due to the need to update indices and cache.

**Other Considerations**

* The benchmark creates an array of 100 objects with properties `a`, `b`, and `d` to ensure that each approach is being tested on a large dataset.
* The use of `var` instead of `let` or `const` for variable declarations might lead to some minor issues due to hoisting, but it's not a significant concern in this case.

**Library/Functionality Used**

The benchmark uses the following JavaScript functions and methods:

1. `Array.prototype.slice()`: creates a new array with the desired elements.
2. `Array.prototype.splice()`: removes elements from the original array.
3. `Array.prototype.shift()`: removes the first element from the original array.

**Special JS Features/Syntax**

The benchmark doesn't explicitly use any special JavaScript features or syntax, such as ES6 classes, async/await, or Promises. However, it does use `var` for variable declarations, which might be considered a legacy syntax in modern JavaScript development.

**Alternatives**

If you're interested in exploring alternative approaches to removing elements from an array, here are some options:

1. Using `filter()` instead of `slice()` or `splice()`: creates a new array with filtered elements.
2. Using `map()` instead of `slice()`: creates a new array with mapped values.
3. Implementing your own custom implementation using loops and indexing.

Keep in mind that these alternatives might not provide the same performance benefits as the original approaches, and you should consider factors like readability, maintainability, and scalability when choosing an approach for your specific use case.

Related benchmarks:

Split vs slice vs Splice javascript (version: 0)

Comparing performance of: Slice vs Splice vs Shift

Created: 3 years ago by: Guest

Jump to the latest result

Slice

Splice

Shift

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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