Benchmark: Array.prototype.concat vs spread operator (no jQuery merge)

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 ]

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 24 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and analyze the provided benchmark.

**What is tested?**

The benchmark compares two approaches for concatenating arrays: `Array.prototype.concat` (the traditional method) and the ES6 spread operator (`...`).

**Options compared**

* Option 1: `Array.prototype.concat`
	+ This method creates a new array by copying elements from the original array (`params`) and another array (`[1, 2]`). It's a widely supported method in JavaScript.
* Option 2: ES6 spread operator (`...`)
	+ This method creates a new array by spreading the elements of the `params` array into the existing array (`[1, 2]`). It's a concise and modern way to concatenate arrays.

**Pros and Cons**

* **Option 1 (Array.prototype.concat)**
	+ Pros:
		- Well-supported in older browsers
		- Can be used with other methods like `push()` or `slice()`
	+ Cons:
		- Creates a new array, which can lead to increased memory usage
		- Less concise than the spread operator
* **Option 2 (ES6 spread operator)**
	+ Pros:
		- Concise and easy to read
		- More modern and efficient than `concat()`
	+ Cons:
		- Not supported in older browsers (not recommended for compatibility reasons)
		- May not work as expected with certain types of arrays or data structures

**Library usage**

The benchmark doesn't use any external libraries. However, it's worth noting that some JavaScript engines may have their own internal optimizations or implementations of the spread operator.

**Special JS features or syntax**

* The ES6 spread operator (`...`) is a feature introduced in ECMAScript 2015 (ES6). It's designed to make array manipulation more concise and expressive.
* `concat()` is a native JavaScript method that has been part of the language since its inception. However, it may not be as efficient or readable as the spread operator.

**Other alternatives**

If you want to explore alternative approaches, here are a few options:

* `Array.prototype.push()`: You can use `push()` to add elements to an array and then return the resulting array.
* `slice()`: You can use `slice()` to create a new array with a subset of elements from another array.
* Custom implementation: If you need more control over the concatenation process, you can implement your own custom function using loops or recursion.

In summary, the benchmark compares two widely used methods for concatenating arrays: `Array.prototype.concat` and the ES6 spread operator. The spread operator is a concise and modern way to concatenate arrays, but it may not be supported in older browsers.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Browser/OS: Chrome 73 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	1631538.2 Ops/sec
spread operator	8992744.0 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator (no jQuery merge) (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 24 days ago):