Benchmark: (fair) Array slice vs for loop with direct attribution

Script Preparation code:

var data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];

Tests:

Array Slice
var copy = data.slice(0, 4);
Direct Attribution
var copy = []; for (var i = 0; i < 5; i++) { copy = []; copy[i] = data[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array Slice
Direct Attribution

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 break down what's being tested in the provided JSON.

The benchmark is comparing two approaches for copying a subset of an array:

1. **Array Slice**: The `slice()` method creates a new array and copies elements from the original array to the new one.
2. **Direct Attribution**: This approach involves creating an empty array, then iterating over the original array, assigning each element to the new array.

**Comparison**

The benchmark is measuring which approach is faster, in terms of executions per second (ExecutionsPerSecond).

**Options Compared**

* `Array Slice` vs `Direct Attribution`

**Pros and Cons**

1. **Array Slice**
	* Pros:
		+ Concise and readable code
		+ Efficient, as it creates a new array with the desired elements
	* Cons:
		+ May allocate more memory, depending on the size of the original array
		+ Not suitable for large datasets, due to potential memory issues
2. **Direct Attribution**
	* Pros:
		+ Memory-efficient, as only one temporary array is created
		+ Suitable for large datasets
	* Cons:
		+ More verbose code, making it less readable
		+ May be slower due to the overhead of creating and managing multiple arrays

**Other Considerations**

* The `slice()` method is a built-in JavaScript method that creates a shallow copy of an array. It's generally faster and more efficient than creating an empty array and iterating over the original array.
* If memory efficiency is critical, Direct Attribution might be preferred. However, for most cases, Array Slice is likely to be faster and more convenient.

**Library Usage**

None mentioned in this benchmark.

**Special JS Features or Syntax**

Not applicable in this example.

Now, let's discuss alternatives:

1. **Splice()**: Instead of `slice()`, you could use the `splice()` method to extract a subset of an array. However, it would be slower and less efficient than using `slice()`.
2. **Array.from()**: You can use the `from()` method to create a new array from an iterable, but this approach is also less efficient and more verbose than using `slice()`.
3. **Destructuring assignment**: Another alternative for copying an array element-wise would be using destructuring assignment, but this approach would only work with arrays of length 1.

Keep in mind that the choice of implementation depends on specific requirements and constraints.

Related benchmarks:

(fair) Array slice vs for loop with direct attribution (version: 0)

slice is just better

Comparing performance of: Array Slice vs Direct Attribution

Created: 3 years ago by: Guest

Jump to the latest result

Array Slice

Direct Attribution

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):