Benchmark: Javascript - Array merge

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

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	21694734.0 Ops/sec
spread operator	74076928.0 Ops/sec
jQuery merge	34240648.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is designed to compare three techniques for merging performance-focused arrays:

1. `Array.prototype.concat()`
2. Spread operator (`...`)
3. jQuery merge (`$.merge()`)

**Script Preparation Code**

There is no script preparation code provided, which means the benchmark will use a default script.

**Html Preparation Code**

The HTML preparation code includes a reference to jQuery 3.3.1, which suggests that the benchmark may also test browser compatibility with different versions of jQuery.

**Test Cases**

Each test case defines a simple JavaScript function that generates an array `params` and then merges it with another array using one of the three techniques:

1. **Array.prototype.concat()**
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ].concat(params);
```
This technique uses the `concat()` method to merge the two arrays.

**Pros and Cons**

* Pros:
	+ Easy to implement
	+ Well-supported in most browsers
* Cons:
	+ Can be slower for large arrays due to the overhead of creating a new array

2. **Spread Operator (`...`)**

```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2, ...params ];
```
This technique uses the spread operator (`...`) to merge the two arrays.

**Pros and Cons**

* Pros:
	+ Fast and efficient
	+ Recently introduced in ECMAScript 2018
* Cons:
	+ Not supported in older browsers (before IE11)

3. **jQuery merge (`$.merge()`)**

```javascript
var params = [ "hello", true, 7 ];
var other = $.merge([1, 2], params);
```
This technique uses the jQuery `merge()` method to merge the two arrays.

**Pros and Cons**

* Pros:
	+ Easy to implement in browsers that support jQuery
	+ Can be faster than `concat()` for large arrays
* Cons:
	+ Requires jQuery library, which can add overhead

**Library: jQuery**

jQuery is a popular JavaScript library that provides a simple way to manipulate the DOM. In this benchmark, it's used to provide the `merge()` method.

**Special JS Feature/ Syntax: None**

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Other Alternatives**

Some alternative methods for merging arrays include:

* Using `Array.prototype.slice()` and `Array.prototype.push()`
* Using `concat()``` with a temporary array
* Using a library like Lodash, which provides a `merge()` method

However, these alternatives are not being tested in this benchmark.

Overall, the benchmark is designed to compare the performance of three techniques for merging arrays: `Array.prototype.concat()`, spread operator (`...`), and jQuery merge (`$.merge()`). The results will show which technique is fastest and most efficient for merging arrays.

Related benchmarks:

Javascript - Array merge (version: 0)

Comparison of techniques for merging performance-focused arrays.

Comparing performance of: Array.prototype.concat vs spread operator vs jQuery merge

Created: 6 years ago by: Registered User

Jump to the latest result

Array.prototype.concat

spread operator

jQuery merge

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):