Benchmark: Set array to [] vs splice

Tests:

Set array to []
var size = 10000; var arr2 = []; for (var i = 0; i < size; i++){ arr2.push(i); } arr2 = [];
Splice array
var size = 10000; var arr3 = []; for (var i = 0; i < size; i++){ arr3.push(i); } arr3.splice(0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Set array to []
Splice array

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into explaining the provided benchmark.

**What is being tested?**

The benchmark tests two different approaches to reset an array in JavaScript:

1. **Set array to []**: This approach uses the `[]` syntax to create a new empty array and assigns it to the variable `arr2`. The original array remains unchanged.
2. **Splice array**: This approach uses the `splice()` method to remove all elements from the array and then assigns an empty array to the variable `arr3`.

**Options compared**

The benchmark compares the execution times of these two approaches:

* Set array to [] (approach 1)
* Splice array (approach 2)

**Pros and Cons of each approach:**

* **Set array to []**
	+ Pros:
		- Creates a new empty array, which can be beneficial for memory efficiency.
		- Does not modify the original array, which can make it easier to reason about the code.
	+ Cons:
		- May incur overhead due to creating a new array object.
* **Splice array**
	+ Pros:
		- Modifies the original array in place, which can be more efficient for large arrays.
	+ Cons:
		- Can modify the original array unexpectedly if not used carefully.

**Library usage**

There is no explicit library usage mentioned in this benchmark. However, it's worth noting that `splice()` method is a built-in JavaScript method and does not require any additional libraries.

**Special JS feature or syntax**

None of the test cases use any special JavaScript features or syntax beyond the standard `push()`, `splice()`, and array assignment operations.

**Other alternatives**

For resetting arrays, other approaches could include:

* Using `Array.prototype.fill()` to fill an existing array with a new value.
* Creating a new array using the spread operator (`[...array]`) and assigning it to a new variable.
* Using `Array.prototype.reduce()` to create a new empty array.

However, these alternatives may have different performance characteristics compared to the approaches tested in this benchmark.

I hope this explanation helps!

Related benchmarks:

Set array to [] vs splice (version: 0)

Set array to [] vs splice

Comparing performance of: Set array to [] vs Splice array

Created: 4 years ago by: Guest

Jump to the latest result

Set array to []

Splice array

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):