Benchmark: Array.prototype.slice vs spread operator!111

Tests:

Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.slice
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Linux

View result in a separate tab

Test name	Executions per second
Array.prototype.slice	208547040.0 Ops/sec
spread operator	131037816.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The benchmark compares two approaches to create a copy of an array:

1. `Array.prototype.slice()`
2. The new ES6 spread operator (`[ ...params ]`)

These methods are used to create a shallow copy of an array in JavaScript.

**Options compared:**

* **Slice method**: This is the traditional way to create a copy of an array in JavaScript. It takes two arguments, `start` and `end`, which define the portion of the original array to be copied.
* **Spread operator**: This is a new feature introduced in ES6 that allows you to spread the elements of an array into a new array.

**Pros and Cons:**

* **Slice method**:
	+ Pros:
		- Well-established, widely supported, and easy to use.
	+ Cons:
		- Can be slower than the spread operator for large arrays.
		- Creates a shallow copy, which means that if the original array contains mutable objects (e.g., arrays or objects), modifying those objects in the new array will affect the original array as well.
* **Spread operator**:
	+ Pros:
		- Faster and more efficient than the slice method for large arrays.
		- Creates a shallow copy, just like the slice method.
	+ Cons:
		- Introduced relatively recently, so support might not be as widespread as the slice method.
		- Can be less intuitive to use, especially for developers who are not familiar with ES6 features.

**Library usage:**

There is no library used in this benchmark. The code snippets provided only demonstrate basic JavaScript syntax.

**Special JS feature or syntax:**

The spread operator (`[ ...params ]`) is a new feature introduced in ES6. It allows you to spread the elements of an array into a new array, creating a copy of the original array.

**Other alternatives:**

* **Array.prototype.concat()**: This method creates a new array and copies elements from the original array to it.
* **Array.prototype.slice.call()**: This method takes an array as an argument and returns a new array with the same elements. (Note that this is not exactly equivalent to the spread operator, which creates a shallow copy.)

In terms of performance, the benchmark likely aims to compare the efficiency of these two methods in creating a copy of an array.

The provided latest benchmark results show that:

* Chrome 114 on Linux Desktop executed `Array.prototype.slice()` approximately 1.59 times faster than the spread operator.
* The spread operator created more executions per second than the slice method, but this might be due to other factors such as browser-specific optimizations or differences in execution frequency.

Keep in mind that the results may vary depending on the specific use case and JavaScript environment.

Related benchmarks:

Array.prototype.slice vs spread operator!111 (version: 0)

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

Comparing performance of: Array.prototype.slice vs spread operator

Created: one year ago by: Guest

Jump to the latest result

Array.prototype.slice

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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