Benchmark: Array push an element vs spread (fixed)

Script Preparation code:

var arr = [100,324,234,234,2,4,4,23,423,42,5,34,63,45,354,23,525,235,23,52,35,235,2,352,35,2,35,235,23,52,53,25,2,35,23,52,35,25235,235,23,52,52,35,235,23,525]

Tests:

Array.push
arr.push(2)
Array spread
arr = [...arr, 2]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.push
Array spread

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down what is tested on the provided JSON benchmark and explain the different approaches compared.

**Benchmark Purpose**

The primary goal of this benchmark is to compare the performance of two ways to add an element to an array in JavaScript:

1. Using the `push()` method
2. Using the spread operator (`...`)

**Options Compared**

Two options are being compared:

* **Option 1: `arr.push(2)`**
	+ This approach uses the `push()` method, which adds a new element to the end of the array.
	+ The advantage is that it's a simple and well-known operation in JavaScript.
	+ However, it might not be as efficient as other approaches for large arrays or arrays with many elements at the beginning.
* **Option 2: `arr = [...arr, 2]`**
	+ This approach uses the spread operator to create a new array by concatenating the original array with the element `[2]`.
	+ The advantage is that it creates a new array and doesn't modify the original one, which can be beneficial for some use cases.
	+ However, it's generally slower than using `push()` because of the overhead of creating a new array.

**Pros and Cons**

* **`arr.push(2)`**
	+ Pros:
		- Fast and efficient
		- Simple and well-known operation
	+ Cons:
		- May not be as efficient for large arrays or arrays with many elements at the beginning
		- Modifies the original array
* **`arr = [...arr, 2]`**
	+ Pros:
		- Creates a new array and doesn't modify the original one (in some cases)
		- Can be beneficial for preserving the integrity of the original data
	+ Cons:
		- Generally slower than using `push()`
		- Has higher overhead due to creating a new array

**Library Used**

None is explicitly mentioned in this benchmark. However, if we look at the "Script Preparation Code", we can see that it's defining a variable `arr` and initializing it with an array of numbers.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark other than the use of spread operator (`...`).

Related benchmarks:

Array push an element vs spread (fixed) (version: 0)

Comparing performance of: Array.push vs Array spread

Created: 4 years ago by: Guest

Jump to the latest result

Array.push

Array spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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