Benchmark: Array#concat vs Array#push

Tests:

Array#push
let array1 = ['a', 'b', 'c']; array1.push('d');
Array#concat
let array1 = ['a', 'b', 'c']; array1.concat('d');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array#push
Array#concat

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**What is being tested?**

The benchmark compares two ways to append an element to an array in JavaScript:

1. `Array#push`: This method appends one or more elements to the end of an array.
2. `Array#concat`: This method creates a new array by concatenating another array (or values) with the existing array.

**Options being compared**

The benchmark is comparing the performance of these two approaches:

* `Array#push`
* `Array#concat`

**Pros and cons of each approach**

1. `Array#push`:
	* Pros: Fast, efficient, and widely supported.
	* Cons: May not be as flexible or expressive as other methods, as it requires specifying the number of elements to append.
2. `Array#concat`:
	* Pros: More flexible and expressive than `Array#push`, as it allows appending multiple values without specifying their count.
	* Cons: Slower than `Array#push`, especially for large arrays.

**Other considerations**

* Both methods create a new array with the appended element(s), which can lead to memory allocation issues if not handled carefully.
* In modern JavaScript, the performance difference between these two methods is relatively small, and the choice of method often depends on the specific use case or personal preference.

**Library usage (none in this example)**

There are no libraries mentioned in this benchmark definition.

**Special JS features or syntax**

The benchmark uses a feature-specific syntax for the `Array#push` and `Array#concat` methods, which may be considered outdated. However, it's still widely supported in modern browsers.

**Alternative approaches**

If you're looking for alternative ways to append elements to an array, some other options include:

* Using the spread operator (`...array`) with `push()`: `array.push(...newArray)`
* Using `unshift()` or `splice()` instead of `push()`
* Creating a new array using the `Array.from()` method and pushing elements onto it: `let newArray = Array.from([], (value) => value); newArray.push(element)`

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:100.0) Gecko/20100101 Firefox/100.0

Browser/OS: Firefox 100 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Array#push	128624520.0 Ops/sec
Array#concat	20799118.0 Ops/sec

Related benchmarks:

Array#concat vs Array#push (version: 0)

Comparing performance of: Array#push vs Array#concat

Created: 2 years ago by: Guest

Jump to the latest result

Array#push

Array#concat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):