Benchmark: Clone and append to beginning of array

Clone and append to beginning of array (version: 0)

Compare the new toSpliced() method, the slice() + unshift() method and the spread operator in cloning and appending an element to the beginning of an array.

Comparing performance of: Array.prototype.toSpliced vs Array.prototype.slice + Array.prototype.unshift vs Spread operator

Created: 9 months ago by: Registered User

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Script Preparation code:

var array = ["hello", true, 7];
var newElement = "new";

AخA
 
var array = ["hello", true, 7];var newElement = "new";

Tests:

Array.prototype.toSpliced
const newArray = array.toSpliced(0, 0, newElement);
const newArray = array.toSpliced(0, 0, newElement);
Array.prototype.slice + Array.prototype.unshift
const newArray = array.slice(); newArray.unshift(newElement);
const newArray = array.slice();
newArray.unshift(newElement);
Spread operator
const newArray = [newElement, ...array];
const newArray = [newElement, ...array];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
Array.prototype.toSpliced
Array.prototype.slice + Array.prototype.unshift
Spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0

Browser/OS: Firefox 128 on Windows

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Test name	Executions per second
Array.prototype.toSpliced	18843596.0 Ops/sec
Array.prototype.slice + Array.prototype.unshift	15991052.0 Ops/sec
Spread operator	20711536.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 5 months ago):

Let's break down the provided benchmark and explain what's being tested, compared, and its pros and cons.

Benchmark Definition

The benchmark is designed to compare three approaches for cloning and appending an element to the beginning of an array:

Array.prototype.toSpliced()
Array.prototype.slice() + Array.prototype.unshift()
The spread operator (...)

What's being tested?

Each test case measures the performance of a specific approach for cloning and appending an element to the beginning of an array.

Array.prototype.toSpliced() tests the new method introduced in ECMAScript 2022, which allows splicing multiple elements at once.
Array.prototype.slice() + Array.prototype.unshift() tests a more traditional approach using the slice() method to create a copy and then appending the element using unshift().
The spread operator (...) tests creating a new array by spreading the original array's elements.

Comparison

The benchmark compares these three approaches, likely to determine which one is the fastest and most efficient.

Pros and Cons of each approach:

Array.prototype.toSpliced():
- Pros: Efficient, simple syntax.
- Cons: New method (not widely supported), may not work as expected in older browsers or environments.
Array.prototype.slice() + Array.prototype.unshift():
- Pros: Widely supported, works across most browsers and environments.
- Cons: More verbose syntax, potentially slower due to the extra method calls.
Spread operator (...):
- Pros: Modern syntax, efficient, and widely supported.
- Cons: May not be compatible with older browsers or environments.

Library usage

None of the approaches rely on external libraries.

Special JavaScript features or syntax

The spread operator (...) is a modern JavaScript feature introduced in ECMAScript 2015. It's a shorthand way to create a new array by spreading elements from an existing array.

Other alternatives

There may be other ways to clone and append an element to the beginning of an array, such as using Array.prototype.concat() or creating a new array manually with new Array(array.length + 1). However, these approaches are likely not being tested in this benchmark.

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and its pros and cons.

**Benchmark Definition**

The benchmark is designed to compare three approaches for cloning and appending an element to the beginning of an array:

1. `Array.prototype.toSpliced()`
2. `Array.prototype.slice()` + `Array.prototype.unshift()`
3. The spread operator (`...`)

**What's being tested?**

Each test case measures the performance of a specific approach for cloning and appending an element to the beginning of an array.

* `Array.prototype.toSpliced()` tests the new method introduced in ECMAScript 2022, which allows splicing multiple elements at once.
* `Array.prototype.slice()` + `Array.prototype.unshift()` tests a more traditional approach using the `slice()` method to create a copy and then appending the element using `unshift()`.
* The spread operator (`...`) tests creating a new array by spreading the original array's elements.

**Comparison**

The benchmark compares these three approaches, likely to determine which one is the fastest and most efficient.

**Pros and Cons of each approach:**

1. **`Array.prototype.toSpliced()`**:
	* Pros: Efficient, simple syntax.
	* Cons: New method (not widely supported), may not work as expected in older browsers or environments.
2. **`Array.prototype.slice()` + `Array.prototype.unshift()`**:
	* Pros: Widely supported, works across most browsers and environments.
	* Cons: More verbose syntax, potentially slower due to the extra method calls.
3. **Spread operator (`...`)**:
	* Pros: Modern syntax, efficient, and widely supported.
	* Cons: May not be compatible with older browsers or environments.

**Library usage**

None of the approaches rely on external libraries.

**Special JavaScript features or syntax**

The spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015. It's a shorthand way to create a new array by spreading elements from an existing array.

**Other alternatives**

There may be other ways to clone and append an element to the beginning of an array, such as using `Array.prototype.concat()` or creating a new array manually with `new Array(array.length + 1)`. However, these approaches are likely not being tested in this benchmark.

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