Benchmark: Array.prototype.concat vs spread operator2

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

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 28 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which outlines the scope and goals of the benchmark. Here's what we're testing:

* We're comparing three approaches for concatenating arrays:
	+ `Array.prototype.concat()`
	+ The new ES6 spread operator (`...`)
	+ jQuery's `$merge()` method
* The test data includes an array of strings (`"hello"`) and a boolean value (`true`), which will be concatenated with an existing array `[1, 2]`.

**Options Compared**

We're comparing the performance of three different approaches:

* `Array.prototype.concat()`: A traditional method for concatenating arrays, which creates a new array by combining the elements of two or more arrays.
* The new ES6 spread operator (`...`): A feature that allows us to extract a subset of an object's properties using the syntax `objectPropertyNames [...object]`. In this case, we're using it to create a new array by spreading the elements of the input array (`params`).
* jQuery's `$merge()` method: A utility function provided by jQuery that merges two or more arrays into one.

**Pros and Cons**

Here are some pros and cons for each approach:

* `Array.prototype.concat()`: Pros:
	+ Widely supported across different browsers
	+ Easy to understand and use
	+ Can be used with other array methods (e.g., `push()`, `slice()`)
* Cons:
	+ Creates a new array, which can lead to memory overhead
	+ May not be as efficient as other approaches for large datasets
* ES6 spread operator (`...`):
	+ More concise and expressive than traditional concatenation
	+ Can be used with other array methods (e.g., `concat()`, `map()`)
	+ Widely supported across modern browsers
* Cons:
	+ May not work as expected in older browsers or environments that don't support the feature
	+ Requires knowledge of the spread operator syntax
* jQuery's `$merge()` method:
	+ Provides a simple and concise way to merge arrays
	+ Works well with other jQuery methods (e.g., `append()`, `html()`)
	+ Requires inclusion of the jQuery library

**Library Usage**

The benchmark uses jQuery, which is a popular JavaScript library for DOM manipulation and event handling. In this case, we're using the `$merge()` method to concatenate arrays.

**Special JS Feature or Syntax**

The spread operator (`...`) is a new feature introduced in ECMAScript 2015 (ES6). It allows us to extract a subset of an object's properties using the syntax `objectPropertyNames [...object]`. In this benchmark, we're using it to create a new array by spreading the elements of the input array (`params`).

**Other Alternatives**

Some other alternatives for concatenating arrays include:

* Using the `Array.prototype.push()` method and creating an empty array: `[...].push(...)` and then `_push` method calls.
* Using the `Array.prototype.reduce()` method: `[1, 2, ...].reduce((a, b) => [...], a)`
* Using a library like Lodash or Ramda for more functional programming approaches.

Keep in mind that these alternatives might not be as concise or expressive as the spread operator or jQuery's `$merge()` method, but they can provide different trade-offs and use cases.

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/64.0.3282.140 Safari/537.36 Edge/18.17763

Browser/OS: Edge 18.17763 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	1877912.0 Ops/sec
spread operator	1120533.6 Ops/sec
jQuery merge	1630803.6 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator2 (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 28 days ago):