Benchmark: test444 - MeasureThat.net

Tests:

spread
const arr1 = [0,1,2,3]; const arr2 = [4,5,6,7]; return [...arr1, ...arr2]
concat
const arr1 = [0,1,2,3]; const arr2 = [4,5,6,7]; return arr1.concat(arr2);
push
const arr1 = [0,1,2,3]; const arr2 = [4,5,6,7]; let arrR = []; arrR.push(arr1, arr2); return arrR;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
concat
push

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. A microbenchmark is a small, simple test designed to measure the performance of specific code snippets or features in JavaScript.

The provided JSON represents a benchmark definition and three individual test cases. Let's break down what each component tests:

* **Benchmark Definition**: This section defines the general characteristics of the benchmark, such as its name, description, script preparation code, and HTML preparation code (both are null in this case). It serves as a metadata container for the benchmark.
* **Individual Test Cases**: Each test case represents a specific piece of JavaScript code to be executed. The test cases in question compare three different approaches:
	1. `spread` (using the spread operator `...`)
	2. `concat`
	3. `push`

These three approaches are compared to determine which one is the most efficient.

**Approaches Compared**

Here's a brief overview of each approach:

* **Spread**: Using the spread operator (`...`) to concatenate arrays.
```javascript
return [...arr1, ...arr2];
```
Pros: Efficient and concise way to concatenate arrays. It creates a new array with all elements from both `arr1` and `arr2`.
Cons: Can be slower for very large arrays due to the overhead of creating a new array.

* **Concat**: Using the `concat()` method to concatenate arrays.
```javascript
return arr1.concat(arr2);
```
Pros: Widely supported and well-documented. It can handle large arrays without significant performance degradation.
Cons: Can be slower than spread due to the overhead of function calls and memory allocations.

* **Push**: Using the `push()` method to append elements to an array.
```javascript
let arrR = [];
arrR.push(arr1, arr2);
return arrR;
```
Pros: Fast and efficient way to concatenate arrays. It appends elements to the existing array without creating a new one.
Cons: Can lead to stack overflow errors if the number of elements is very large.

**Library Used**

In this case, there are no libraries explicitly mentioned in the benchmark definition or test cases. However, it's likely that MeasureThat.net uses some underlying JavaScript engine or runtime environment that provides the necessary functionality for these tests.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark. The code snippets only use standard JavaScript language constructs.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few:

* **Array.prototype.reduce()**: Using the `reduce()` method to concatenate arrays.
```javascript
return arr1.reduce((a, b) => [...a, ...b]);
```
This approach is concise but may be slower than spread due to its overhead.

* **Array.prototype.forEach()**: Using the `forEach()` method to iterate over arrays and concatenate elements manually.
```javascript
let result = [];
arr1.forEach(x => result.push(...x));
arr2.forEach(y => result.push(...y));
return result;
```
This approach is more verbose but can be efficient for small arrays.

* **Native libraries**: Depending on the underlying JavaScript engine or platform, native libraries like `Array.prototype.spread()` (in some browsers) or `native-spreading` polyfills may offer alternative approaches to concatenating arrays.

Keep in mind that these alternatives might not provide significant performance improvements and should be used judiciously.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Browser/OS: Chrome 73 on Windows

View result in a separate tab

Test name	Executions per second
spread	3801625.8 Ops/sec
concat	5998218.5 Ops/sec
push	26884256.0 Ops/sec

Related benchmarks:

test444 (version: 0)

test

Comparing performance of: spread vs concat vs push

Created: 5 years ago by: Guest

Jump to the latest result

spread

concat

push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):