Benchmark: Array concat methods

Tests:

Spread
let arr = new Array(10000); arr.fill(1); arr = [ ...arr, ...arr ];
Push
let arr = new Array(10000); arr.fill(1); arr.push.apply(arr, arr);
Concat
let arr = new Array(10000); arr.fill(1); arr = arr.concat(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Push
Concat

Fastest: N/A

Slowest: N/A

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

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Let's break down the provided benchmarking test cases.

**What is being tested?**

The benchmark tests the performance of three different methods for concatenating arrays in JavaScript:

1. **Spread operator (`...`)**: This method uses the spread operator to create a new array by copying elements from the original array and then appending them again.
2. **`push()` with `apply()`**: This method uses the `push()` method to add elements to the end of the array, but instead of calling it directly, it uses the `apply()` method to pass the array as an argument.
3. **`concat()`**: This method creates a new array by copying all elements from the original array.

**Options compared**

The benchmark compares these three methods for concatenating arrays. The test aims to determine which method is the most efficient in terms of performance.

**Pros and cons of each approach:**

* **Spread operator (`...`)**:
	+ Pros:
		- More concise and expressive than traditional array concatenation.
		- Creates a new copy of the original array, avoiding potential side effects.
	+ Cons:
		- May have overhead due to creating a new copy of the array.
* **`push()` with `apply()`**:
	+ Pros:
		- Uses existing implementation for `push()`, which is optimized.
		- Avoids creating a new copy of the array, reducing memory allocation and deallocation.
	+ Cons:
		- May have additional overhead due to passing the array as an argument to `apply()`.
* **`concat()`**:
	+ Pros:
		- Uses existing implementation for concatenation, optimized for performance.
	+ Cons:
		- Creates a new copy of the original array, which can be memory-intensive.

**Other considerations:**

* The benchmark does not consider other factors that might affect performance, such as the size and distribution of the data being concatenated.
* The test uses Chrome 118 as the browser, but it's possible that other browsers or environments may behave differently.

**Library usage**

There is no explicit library usage mentioned in the provided code snippets. However, some libraries like Lodash or Ramda might provide optimized implementations for array concatenation methods.

**Special JavaScript features or syntax**

The benchmark uses the spread operator (`...`), which is a relatively recent feature introduced in ECMAScript 2015 (ES6). It's designed to create new arrays by copying elements from an existing array and then appending them again.

Related benchmarks:

Array concat methods (version: 0)

Comparing performance of: Spread vs Push vs Concat

Created: 2 years ago by: Guest

Jump to the latest result

Spread

Push

Concat

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):