Benchmark: Array.prototype.concat vs spread operator

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ ...[1, 2], ...params ]
jQuery merge
var params = [ "hello", true, 7 ]; var other = $.merge([1, 2], params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
jQuery merge

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 dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark compares three approaches to concatenate an array with another array or an array literal:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)
3. jQuery's `$merge()` function

These three approaches have different performance characteristics, and the benchmark aims to determine which one is the fastest.

**Options Compared**

The two main options being compared are:

* `Array.prototype.concat()`: This method takes an array as its first argument and another array or array literal as its second argument, concatenating them and returning the result.
* The new ES6 spread operator (`...`): This operator allows you to create a new array by spreading elements from an existing array or array literal.

**Pros and Cons**

Here are some pros and cons of each approach:

* `Array.prototype.concat()`:
	+ Pros: Widely supported, easy to use, and has been around for a long time.
	+ Cons: Can be slower than the spread operator due to its method call overhead.
* The new ES6 spread operator (`...`):
	+ Pros: Fast, modern, and widely adopted.
	+ Cons: May not work in older browsers or environments that don't support it.

**jQuery Merge**

The third option uses jQuery's `$merge()` function, which takes two arrays as arguments and returns a new array containing all elements from both arrays. This approach is often used in older JavaScript versions or environments where the spread operator is not supported.

* Pros: Can work in older browsers or environments.
* Cons: May be slower than the spread operator due to jQuery's overhead.

**Library and Purpose**

The `$.merge()` function is part of the jQuery library, which provides a set of DOM manipulation and event handling functions. The purpose of `$merge()` is to concatenate two arrays while preserving the structure of both input arrays.

**Special JS Feature or Syntax**

None of the three approaches rely on special JavaScript features or syntax beyond what is covered in the standard ES6 specification. However, it's worth noting that some older browsers may not support the spread operator or jQuery's `$merge()` function.

**Other Alternatives**

If you're interested in exploring alternative approaches to concatenating arrays, you might consider using other methods like:

* `Array.prototype.push()`: This method adds elements to an existing array without creating a new one.
* `Array.prototype.slice()`: This method creates a shallow copy of an array by slicing it and returning a new array.

However, these alternatives may not be as efficient or modern as the spread operator.

I hope this explanation helps you understand the benchmark and its focus on comparing different approaches to concatenating arrays!

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser/OS: Chrome 66 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	3508385.8 Ops/sec
spread operator	1975245.8 Ops/sec
jQuery merge	880203.6 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 vs jQuery merge

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

jQuery merge

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):