Benchmark: Array.prototype.concat vs spread operator.

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested, the options compared, pros and cons of each approach, and other considerations.

**What is being tested?**

The benchmark is comparing two ways to create a new array by concatenating an existing array: the traditional `Array.prototype.concat()` method and the ES6 spread operator (`...`).

**Options compared**

There are two test cases:

1. **Traditional `concat()` method**: This involves calling `concat()` on the original array, passing the original array as an argument.
2. **ES6 spread operator (`...`)**: This involves using the spread operator to create a new array by duplicating the elements of the original array.

**Pros and cons of each approach**

1. **Traditional `concat()` method**
	* Pros:
		+ Well-supported across older browsers
		+ Can be used with non-array objects (e.g., strings, numbers)
	* Cons:
		+ Creates a new array object, which can lead to performance overhead if the original array is large
		+ Can be slower than the spread operator for large arrays
2. **ES6 spread operator (`...`)**
	* Pros:
		+ More concise and readable code
		+ Avoids creating a temporary array object
		+ Supports non-array objects (e.g., strings, numbers)
	* Cons:
		+ May not be supported in older browsers (though many do support it by now)
		+ Can lead to unexpected behavior if not used carefully

**Other considerations**

* The benchmark is running on a desktop device with Chrome 78 and Mac OS X 10.14.6.
* The test cases are designed to create arrays of three elements each: two strings and one boolean.

**Library usage**

There is no explicit library mentioned in the provided JSON, but the spread operator (`...`) is a part of the ECMAScript standard (ES6) and is widely supported across modern browsers.

**Special JS feature or syntax**

The ES6 spread operator (`...`)) is a new feature introduced in JavaScript version 6. While it's not explicitly mentioned in the provided JSON, it's likely that this benchmark assumes that all test users are using a recent version of JavaScript (ES6+) and a compatible browser.

**Other alternatives**

If you were to implement an alternative approach for creating arrays, some options could include:

1. Using `Array.prototype.slice()` with the `0` and `-1` indices to create a shallow copy of the original array.
2. Utilizing a library like Lodash or Underscore.js, which provide utility functions for working with arrays.

However, these alternatives may not be as efficient or concise as the spread operator, and may add unnecessary overhead or complexity to your codebase.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.70 Safari/537.36

Browser/OS: Chrome 78 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	5421919.0 Ops/sec
spread operator	18908834.0 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator. (version: 0)

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

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

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):