Benchmark: Array.prototype.concat vs spread operator!!!

Tests:

Array.prototype.concat
var params = [ 1, 6, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ 1, 6, 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

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Browser/OS: Chrome 70 on Mac OS X 10.13.6

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	5551389.0 Ops/sec
spread operator	22222908.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark compares two approaches to concatenate arrays in JavaScript:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)

The test case creates an array `params` with three elements: `[ 1, 6, 7 ]`. Then it attempts to concatenate this array with another array `other` using both methods.

**Test Cases**

There are two individual test cases:

1. `Array.prototype.concat`: This method concatenates the `params` array with the `other` array using the `concat()` function.
2. `spread operator`: This uses the new ES6 spread operator (`...`) to concatenate the `params` array with the `other` array.

**Options Compared**

The two options being compared are:

* **Traditional concatenation using `Array.prototype.concat()```**: This method creates a new array by copying all elements from both arrays and returns it.
* **New ES6 spread operator (`...`)```**: This method creates a new array with the elements from the original array, followed by the elements of the second array.

**Pros and Cons**

**Traditional concatenation using `Array.prototype.concat()``**

Pros:

* Wide browser support (has been available since ECMAScript 5)
* Easy to read and understand
* Can be used for larger arrays

Cons:

* Creates a new array, which can lead to memory allocation overhead
* Not as efficient as the spread operator in modern browsers

**New ES6 spread operator (`...`)`

Pros:

* More concise and readable
* Efficiently creates a new array without allocating unnecessary memory

Cons:

* Requires modern JavaScript engines (ES6+) to work correctly
* Can be less intuitive for developers familiar with traditional concatenation methods

**Library/Functionality Used**

The benchmark uses the `concat()` function, which is a method of the `Array.prototype` object. This function is part of the ECMAScript standard and has been available since ECMAScript 5.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax mentioned in the provided benchmark definition.

**Other Alternatives**

If you want to compare other concatenation methods, here are a few alternatives:

* Using `Array.prototype.push()`: You can use the `push()` function to add elements to an array and then return the modified array.
* Using a loop: You can create a new array by looping through the elements of both arrays and pushing them onto the new array.

However, these approaches are less efficient and more verbose than the traditional concatenation using `Array.prototype.concat()` or the spread operator.

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: 6 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 7 months ago):