Benchmark: Test Array-to-Push Matrix

Script Preparation code:

var subarrs = [
 [ "hello", true, 7 ],
 [ "yes", "no", "maybe", false, 27 ],
 [ 16, "I", "wonder", "what", "will", "be", "fastest"]
];

Tests:

Array.prototype.concat
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other = other.concat(subarrs[i]); } return other;
spread operator
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other = [ ...other, ...subarrs[i] ] } return other;
Push Spread
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other.push(...subarrs[i]); } return other;
Push Apply
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other.push.apply(other, subarrs[i]); } return other;
Push Loop
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ for (var jarr = subarrs[i], jen = jarr.length, j = 0; j < jen; j++){ other.push(jarr[j]); } } return other;
Array ForEach
var other = [ 1, 2, 3 ]; subarrs.forEach((subArr) => { subArr.forEach((subArrItem) => { other.push(subArrItem); }); }); return other;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push Spread
Push Apply
Push Loop
Array ForEach

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36

Browser/OS: Chrome 100 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	1339118.4 Ops/sec
spread operator	2060388.5 Ops/sec
Push Spread	2623224.0 Ops/sec
Push Apply	2583901.8 Ops/sec
Push Loop	2951658.2 Ops/sec
Array ForEach	5915322.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided JSON represents a benchmark test for comparing different ways to push elements onto an array in JavaScript. The test is designed to measure the performance of various approaches, including traditional `concat()` method, spread operator (`...`), and other methods.

**Test Cases**

There are six test cases:

1. **Array.prototype.concat**: This method uses the traditional concatenation approach by using `concat()` to merge two arrays.
2. **Spread Operator**: This method uses the spread operator (`...`) to push elements onto an array.
3. **Push Spread**: Similar to the spread operator, but with a single `push()` call instead of using multiple `push()` calls with `...`.
4. **Push Apply**: Uses the `apply()` method to pass an array as an argument to `push()`.
5. **Push Loop**: A loop-based approach that pushes each element onto the array.
6. **Array ForEach**: Uses `forEach()` to iterate over the sub-arrays and push elements onto the main array.

**Library Used**

None of the test cases use any external libraries or dependencies, making them platform-agnostic and compatible with most JavaScript environments.

**Special JS Features/Syntax**

The spread operator (`...`) is used in two test cases: **Spread Operator** and **Push Spread**. This feature was introduced in ECMAScript 2015 (ES6) as a shorthand for creating arrays from iterable objects.

**Performance Comparison**

The benchmark results show the performance of each approach, measured in executions per second. The top-performing method is **Array ForEach**, followed closely by **Push Loop** and **Push Spread**. This suggests that using `forEach()` can be more efficient than other approaches for pushing elements onto an array.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Array.prototype.concat**:
	+ Pros: Simple, widely supported.
	+ Cons: Can lead to performance issues if the arrays are large or need frequent concatenation.
* **Spread Operator**:
	+ Pros: Concise, efficient, and modern syntax.
	+ Cons: May not be as well-supported in older browsers or environments.
* **Push Spread**:
	+ Pros: Similar efficiency to spread operator with a single `push()` call.
	+ Cons: Less concise than using the spread operator directly.
* **Push Apply**:
	+ Pros: Can be more efficient for large arrays due to the ability to use an array as an argument to `apply()`.
	+ Cons: May require more code and can lead to performance issues if not used correctly.
* **Push Loop**:
	+ Pros: Simple, easy to understand.
	+ Cons: Can be less efficient than other approaches due to the need for a loop.

In conclusion, the benchmark results suggest that using `forEach()` or push loops can be more efficient than traditional concatenation methods. However, the choice of approach ultimately depends on the specific requirements and constraints of your project.

Related benchmarks:

Test Array-to-Push Matrix (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: Array.prototype.concat vs spread operator vs Push Spread vs Push Apply vs Push Loop vs Array ForEach

Created: 2 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push Spread

Push Apply

Push Loop

Array ForEach

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):