Benchmark: Array push vs spread operator 2.0

Tests:

push
const arr = [1,2,3]; const x = arr.push(4);
spread
const arr = [1,2,3]; const x = [...arr, 4];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
spread

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Windows

View result in a separate tab

Test name	Executions per second
push	72950048.0 Ops/sec
spread	38910840.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark measures the performance difference between two approaches:

1. `Array.push(4)`: This method pushes an element to the end of an array.
2. `...arr, 4`: The spread operator (introduced in ECMAScript 2015) creates a new array by spreading the elements of `arr` and appending `4` to it.

**Options Compared**

The benchmark compares two options:

* `Array.push(4)`
* `...arr, 4` (the spread operator)

**Pros and Cons of Each Approach:**

1. **`Array.push(4)`**
	* Pros:
		+ Native JavaScript method with built-in support.
		+ Can be used with other array methods (e.g., `concat`, `splice`).
	* Cons:
		+ May create a new array object, leading to performance overhead due to memory allocation and copying.
		+ May not be as efficient as the spread operator for large arrays.
2. **`...arr, 4` (spread operator)**
	* Pros:
		+ Creates a new array without modifying the original array.
		+ Can be used with other array methods (e.g., `concat`, `set`) that support the spread operator.
	* Cons:
		+ Introduced in ECMAScript 2015, so older browsers may not support it.
		+ May require additional memory allocation for the new array.

**Library Usage**

None of the test cases use any external libraries.

**Special JavaScript Features/Syntax**

The benchmark uses the spread operator (`...arr, 4`), which was introduced in ECMAScript 2015. This feature allows creating a new array by spreading the elements of an existing array and appending additional elements. The spread operator has become a common pattern in modern JavaScript development.

**Other Considerations**

To run this benchmark effectively, you would need to prepare a test environment with:

* A recent version of Chrome (in this case, 112)
* A Windows desktop platform
* An operating system that supports the latest ECMAScript standard

The `Skip preambles` instruction indicates that some setup or configuration might be necessary before running the benchmark. However, without more information on what specific preambles are being skipped, it's difficult to provide further guidance.

**Alternative Benchmarking Options**

Other alternatives for measuring performance differences between JavaScript operations include:

1. **Benchpress**: A popular open-source benchmarking library for JavaScript.
2. **V8 Benchmark Suite**: A set of benchmarks created by the V8 engine team to measure the performance of various JavaScript operations.
3. **JSPerf**: A web-based benchmarking tool specifically designed for measuring JavaScript performance.

These alternatives might offer more comprehensive test cases, better support for different browsers and platforms, or additional features like caching and auto-reloading.

Related benchmarks:

Array push vs spread operator 2.0 (version: 0)

Comparing performance of: push vs spread

Created: one year ago by: Guest

Jump to the latest result

push

spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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