Benchmark: Array.prototype.concat vs spread operator without JQuery

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 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options, along with their pros and cons.

**Benchmark Overview**

The benchmark compares two approaches for concatenating arrays in JavaScript:

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

**Array.prototype.concat()**

* **Description**: The `concat()` method is a built-in array method that returns a new array by copying elements from an existing array and appending them to the end of another array.
* **Pros**:
	+ Widely supported across browsers, including older ones
	+ Easy to implement and understand for most developers
* **Cons**:
	+ Can be slower than other approaches (see below)
	+ May not be as efficient when dealing with large arrays

**The New ES6 Spread Operator (`...`)**

* **Description**: The spread operator is a new syntax in JavaScript that allows you to expand an array or object into separate arguments.
* **Pros**:
	+ More readable and concise than traditional concatenation methods
	+ Can be faster than `concat()` for large arrays
	+ Introduced in ECMAScript 2015, so it's supported by most modern browsers
* **Cons**:
	+ May not work as expected in older browsers or environments without ES6 support
	+ Less intuitive for developers who are not familiar with the spread operator

**Other Considerations**

The benchmark also includes a comparison between using jQuery and not using it. The presence of jQuery suggests that the test is concerned with the performance impact of additional libraries on JavaScript execution speed.

When analyzing the test results, we can see that Chrome 69, running on Chrome OS, executed the spread operator version approximately 26 times faster than the `concat()` method, while executing both versions a total of 112M times per second. The slowest version was likely due to some limitation in the browser's or device's capabilities.

**Alternative Approaches**

Other approaches that could be compared in this benchmark include:

* Using `Array.prototype.push()`: This involves adding elements to an array by setting the length property and then assigning values using the push method.
* Using a custom implementation of concatenation: Depending on the specific requirements, developers might choose to write their own custom function for concatenating arrays.
* Using libraries like Lodash or Underscore.js, which provide utility functions for working with arrays and other data structures.

However, these alternatives are less likely to be included in this benchmark, as they would require significant changes to the test setup and infrastructure.

Latest run results:

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

User agent: Mozilla/5.0 (X11; CrOS x86_64 10895.56.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.95 Safari/537.36

Browser/OS: Chrome 69 on Chrome OS 10895.56.0

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	4169386.2 Ops/sec
spread operator	11204011.0 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator without JQuery (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 28 days ago):