Benchmark: Array.from vs Spread declaring the Set

Tests:

Array.from
let arr = [] for(var i=0;i<100;i++) { arr.push(i); } var other = Array.from(new Set(arr));
Spread
let arr = [] for(var i=0;i<100;i++) { arr.push(i); } var other = [...new Set(arr)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
Spread

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to creating a Set from an array: using `Array.from` with a new Set object, and using the spread operator (`...`) with a new Set object. The test creates an array of 100 elements, pushes each element into the array, and then uses one of these approaches to create a Set from the array.

**What's being tested?**

1. **Performance**: The benchmark measures which approach is faster.
2. **Memory usage**: Although not explicitly mentioned, we can infer that the benchmark also checks for memory usage differences between the two approaches.

**Options Compared:**

* `Array.from(new Set(arr))`: This method uses `Array.from()` to create an array from a specified iterable (in this case, a Set). The Set object is created first, and then its elements are used to populate the array.
* `[...new Set(arr)]`: This approach uses the spread operator (`...`) to create a new array from the elements of a Set. The Set object is created first, and then its elements are used to populate the array.

**Pros and Cons:**

* `Array.from(new Set(arr))`:
	+ Pros:
		- More explicit and readable code.
		- Might be more suitable for scenarios where you need to perform additional operations on the original Set.
	+ Cons:
		- May incur a slight performance overhead due to the extra method call.
* `[...new Set(arr)]`:
	+ Pros:
		- More concise and expressive code.
		- Might be faster due to the reduced number of method calls.
	+ Cons:
		- Less explicit and readable code, potentially making it harder for others to understand.

**Library:**

The benchmark uses the built-in `Set` object in JavaScript, which is a collection of unique values. The purpose of using a Set here is to ensure that each element in the array is processed only once, without duplicates.

**Special JS Feature/Syntax:**

There are no special JavaScript features or syntaxes used in this benchmark. It's a straightforward comparison of two approaches using standard JavaScript constructs.

**Alternatives:**

If you wanted to test alternative approaches, some possible variations could include:

* Using `Map` instead of `Set`
* Comparing performance with different array sizes
* Adding additional operations (e.g., filtering or mapping) before creating the Set
* Using a different language or framework (if applicable)
* Testing performance on different types of devices or platforms

Related benchmarks:

Array.from vs Spread declaring the Set (version: 0)

Comparing performance of: Array.from vs Spread

Created: 5 years ago by: Guest

Jump to the latest result

Array.from

Spread

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):