Benchmark: Array slice() vs slice(0) vs spread operator2

Script Preparation code:

var baseArray = []
for (var i = 0; i < 50; i++) {
  baseArray.push((Math.floor(Math.random() * Math.floor(1000000))).toString(16)) 
}

Tests:

Array.prototype.slice()
var other = baseArray.slice();
spread operator
var other = [...baseArray];
Array.prototype.slice(0)
var other = baseArray.slice(0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.slice()
spread operator
Array.prototype.slice(0)

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**What is tested on the provided JSON?**

The provided JSON represents a JavaScript microbenchmark that compares three different approaches for creating a subset of an array:

1. `Array.prototype.slice()`: This method creates a shallow copy of a portion of an array.
2. The spread operator (`...`): This operator was introduced in ES6 and allows for the creation of new arrays from existing ones by spreading elements or properties into a new array.
3. `Array.prototype.slice(0)`: This method is similar to `slice()`, but it only returns the subset of elements starting from the beginning of the array.

**Options compared**

The benchmark compares these three approaches:

* **Pros and Cons:**
	+ `Array.prototype.slice()`:
		- Pros: widely supported, efficient in many cases.
		- Cons: may not be as efficient for very large arrays or complex data structures.
	+ Spread operator (`...`):
		- Pros: concise, efficient for small to medium-sized arrays.
		- Cons: still relatively new and not universally supported.
	+ `Array.prototype.slice(0)`:
		- Pros: similar to `slice()`, but with an additional parameter that can be useful for certain use cases.
		- Cons: less commonly used, may have performance implications due to the additional parameter.

**Library usage**

None of the test cases explicitly use a library. However, it's worth noting that `Array.prototype.slice()` and `Array.prototype.slice(0)` are built-in methods of the Array prototype in JavaScript.

**Special JS feature or syntax**

The benchmark uses ES6 syntax for the spread operator (`...`), which was introduced in 2015. If you're using an older version of JavaScript, this syntax may not be supported.

**Other alternatives**

In addition to these three approaches, there are other ways to create a subset of an array:

* `Array.prototype.map()` and `slice()`: `map()` can be used to create a new array with the desired subset of elements, followed by `slice()` to extract only those elements.
* `Array.prototype.filter()` and `slice()`: Similar to the previous approach, using `filter()` to create a new array with the desired elements, followed by `slice()` to extract those elements.

While these alternatives are possible, they may not be as concise or efficient as the three approaches being compared in this benchmark.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0

Browser/OS: Firefox 107 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.slice()	22088500.0 Ops/sec
spread operator	3264545.5 Ops/sec
Array.prototype.slice(0)	22137490.0 Ops/sec

Related benchmarks:

Array slice() vs slice(0) vs spread operator2 (version: 0)

Compare the new ES6 spread operator with the traditional slice() methods

Comparing performance of: Array.prototype.slice() vs spread operator vs Array.prototype.slice(0)

Created: one year ago by: Guest

Jump to the latest result

Array.prototype.slice()

spread operator

Array.prototype.slice(0)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):