Benchmark: subarray perf2 - MeasureThat.net

Script Preparation code:

window.dat = new Uint8Array(1000000);

Tests:

1
dat.subarray(78, -429);
2
dat.slice(78, -429);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

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Test case name	Result
1
2

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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I'll break down the benchmark test case and explain what's being tested, compared, and their pros/cons.

**Benchmark Test Case Overview**

The test case measures the performance of two different approaches to access subarray elements in JavaScript: `subarray()` and `slice()`. Both methods are used to extract a subset of elements from a large array (in this case, a `Uint8Array`).

**Approaches Compared**

1. **`subarray()`**: This method creates a new array object that includes only the specified range of elements from the original array.
2. **`slice()`**: This method returns a shallow copy of a portion of an array into a new array object.

**Pros and Cons of Each Approach**

* `subarray()`
	+ Pros:
		- Can be faster for large arrays, as it creates a new array object that includes only the specified range of elements.
		- Allows for more control over the resulting array object (e.g., modifying the new array).
	+ Cons:
		- Creates a new array object, which can lead to memory overhead.
		- May be slower for small arrays due to the creation of an unnecessary array object.
* `slice()`
	+ Pros:
		- Does not create a new array object, reducing memory overhead.
		- Can be faster for small arrays or when working with arrays that are frequently modified.
	+ Cons:
		- Returns a shallow copy of the specified range of elements, which may affect the original array's internal structure.
		- May lead to performance issues if the resulting slice is very large.

**Library and Special JS Features**

There are no libraries used in this benchmark test case. However, JavaScript has some special features that might be relevant:

* **Array.prototype.subarray()**: Introduced in ECMAScript 2015 (ES6), `subarray()` allows accessing subarrays using the syntax `array.subarray(startIndex, endIndex)`.
* **Array.prototype.slice()**: Also introduced in ES6, `slice()` allows extracting a portion of an array using the syntax `array.slice(startIndex, endIndex)`.

**Other Considerations**

When working with large arrays or performance-critical code, it's essential to consider factors like memory allocation and object creation. In this case, the `subarray()` method might be preferred when working with very large arrays, as it creates a new array object that includes only the specified range of elements.

On the other hand, `slice()` can be beneficial for small arrays or when working with arrays that are frequently modified, due to its reduced memory overhead and faster performance.

**Alternatives**

Other alternatives for accessing subarray elements in JavaScript include:

* Using `Array.prototype.slice()`, which achieves similar results to `subarray()` but without creating a new array object.
* Utilizing libraries like Lodash or Ramda, which provide alternative implementations of these methods with potentially better performance and features.

Keep in mind that the choice of approach ultimately depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

subarray perf2 (version: 0)

Comparing performance of: 1 vs 2

Created: 5 years ago by: Guest

Jump to the latest result

1

2

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):