Benchmark: Remove an item from array; indexOf + splice vs filterasddsaasd

Script Preparation code:

var arr = [];
for (var i = 0; i < 10000; i++) {
  arr.push(Math.floor(Math.random() * 1000));
}
var itemToRemove = arr[Math.floor(Math.random() * 10000)]

Tests:

splice
arr.splice(0);
replace
arr = [];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice
replace

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'll break down the provided benchmark and its options, pros and cons, and other considerations.

**Benchmark Overview**

The benchmark measures the performance of two different approaches to remove an item from an array: `splice` and `replace`. The array is created with 10,000 random elements, and a single element is randomly selected to be removed.

**Options Compared**

1. **Splice**: This method modifies the original array by removing the specified element at the specified index (in this case, the first element). It returns an array of the deleted elements.
2. **Replace**: This method creates a new array with the same elements as the original array but without the element to be removed.

**Pros and Cons**

* **Splice**:
	+ Pros: Can modify the original array in place, potentially reducing memory allocation and deallocation overhead.
	+ Cons: Returns an array of deleted elements, which may not be necessary for all use cases. Also, it can shift elements after the removal, causing potential issues with indexing.
* **Replace**:
	+ Pros: Creates a new array without modifying the original, which is often safer and more predictable. It also avoids the issue of shifting elements.
	+ Cons: Allocates additional memory to create the new array, which may incur performance overhead.

**Library Usage**

In this benchmark, the `Array.prototype.splice` method is used, which is a built-in JavaScript method for removing elements from an array while preserving the existing order.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark. It's a straightforward example of array manipulation using standard JavaScript methods.

**Other Considerations**

* **Array Size**: The array size of 10,000 elements may be too large for some systems to handle efficiently. A smaller array size might provide more accurate results.
* **Randomness**: The random element selection and array creation process can introduce variability in the benchmark results. This may lead to different results on different runs or with different browsers.

**Alternatives**

For similar benchmarks, you might consider:

1. Using `Array.prototype.slice` instead of `splice`.
2. Measuring the performance of other methods for removing elements from an array, such as `filter()` or `map()`.
3. Comparing the performance of creating a new array using different methods (e.g., `concat()`, `push()`, or `set()`).
4. Adding more complexity to the benchmark by including multiple iterations, different data types, or additional overhead.

Keep in mind that these alternatives will depend on the specific requirements and goals of your benchmarking efforts.

Related benchmarks:

Remove an item from array; indexOf + splice vs filterasddsaasd (version: 0)

Comparing performance of: splice vs replace

Created: 3 years ago by: Guest

Jump to the latest result

splice

replace

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):