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 break down the provided JSON for the Array.prototype.concat vs spread operator benchmark.

**Benchmark Definition**

The benchmark compares two approaches to concatenate arrays in JavaScript: the traditional `concat()` method and the new ES6 spread operator (`...`).

**Options Compared**

1. **Array.prototype.concat**: The traditional way of concatenating arrays using the `concat()` method.
2. **Spread Operator (`...`)**: A new feature introduced in ES6 that allows for more concise array creation.

**Pros and Cons of Each Approach**

* **Array.prototype.concat**:
	+ Pros: Widely supported, well-documented, and easy to understand.
	+ Cons: Can be slower than the spread operator due to the overhead of creating a new function call.
* **Spread Operator (`...`)**:
	+ Pros: More concise and expressive, which can lead to more readable code. It also avoids the creation of an intermediate array, making it potentially faster.
	+ Cons: May not be supported in older browsers or environments.

**Library Used**

In one of the test cases, jQuery is used as a library. Specifically, `$.merge()` is used, which is a part of the jQuery API for merging arrays.

* **jQuery merge (`$.merge()`)**: A function provided by jQuery that merges two arrays into a new array. It's not the most efficient way to concatenate arrays and is only necessary if you're using jQuery for other reasons.

**Special JS Feature/Syntax**

The spread operator (`...`) is a special feature in JavaScript introduced in ES6 (EcmaScript 2015). It allows for more concise array creation and has become a popular way to work with arrays in modern JavaScript code.

**Other Considerations**

When choosing between `concat()` and the spread operator, consider the following:

* If you're working on older browsers or environments that don't support the spread operator, use `concat()`.
* If you're writing new code and want more concise and expressive array creation, use the spread operator.
* Keep in mind that while the spread operator can be faster than `concat()` for large arrays, the difference is usually negligible unless you're dealing with very large datasets.

**Alternatives**

Other alternatives to concatenating arrays include:

* Using `Array.prototype.push()` to add elements to an array and then creating a new array from it.
* Using libraries like Lodash or Underscore.js, which provide utility functions for working with arrays.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:59.0) Gecko/20100101 Firefox/59.0

Browser/OS: Firefox 59 on Mac OS X 10.12

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	8013519.0 Ops/sec
spread operator	20145688.0 Ops/sec
jQuery merge	9566488.0 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 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):