Benchmark: Inherited Array splice

Script Preparation code:

var array = new Array();
var count = 100000; 
for(let i = 0; i < count; ++i)
	array.push(i);
	
class SubArray extends Array {
	constructor() {
		super();
	}
}
var subArray = new SubArray();
for(let i = 0; i < count; ++i)
	subArray.push(i);

Tests:

array splice
array.splice(0, 1); array.push(123456789);
subarray splice
subArray.splice(0, 1); subArray.push(123456789);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array splice
subarray splice

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in this benchmark.

The provided JSON represents two test cases for measuring the performance of JavaScript arrays and sub-arrays (classes that extend `Array`).

**What is tested:**

1. The impact of using `splice(0, 1)` on an array vs. a sub-array (`SubArray`). In both cases, an element is removed from the beginning of the array or sub-array, followed by pushing a new value into the modified array or sub-array.
2. The performance difference between two JavaScript approaches:
	* Using an array (`array.splice(0, 1); array.push(123456789);`)
	* Using a sub-array (`subArray.splice(0, 1); subArray.push(123456789);`)

**Options compared:**

The benchmark compares the performance of two different data structures in JavaScript:

1. **Arrays**: Inheritance is not used; arrays are used as-is.
2. **Sub-arrays** (classes that extend `Array`): A custom class, `SubArray`, extends the built-in `Array` type.

**Pros and Cons:**

Using an array vs. a sub-array has different implications:

* **Arrays**: Arrays are more widely supported across browsers and environments, but might incur additional overhead due to inheritance.
	+ Pros:
		- Widely supported
		- Less overhead
	+ Cons:
		- May not provide the desired behavior (e.g., modifying an array can affect its prototype chain)
* **Sub-arrays**: Using a custom class extends `Array` provides more control and flexibility, but might introduce compatibility issues.
	+ Pros:
		- More control over the data structure
		- Can provide specific behavior for certain use cases
	+ Cons:
		- Less widely supported across browsers and environments
		- May incur additional overhead due to inheritance

**Other considerations:**

* **Browser support**: Different browsers might have varying levels of support for custom classes extending `Array`. The benchmark aims to ensure compatibility with a wide range of browsers.
* **Performance implications**: The choice between arrays and sub-arrays can impact performance, as some operations (like `splice`) might be more expensive than others.

**Library usage:**

In this case, the `SubArray` class extends the built-in `Array` type. No additional libraries are used in these benchmark tests.

**Special JS features or syntax:**

None mentioned in the provided code snippets.

Related benchmarks:

Inherited Array splice (version: 0)

Comparing performance of: array splice vs subarray splice

Created: 4 years ago by: Guest

Jump to the latest result

array splice

subarray splice

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):