Benchmark: Set array expansion

Script Preparation code:

var mySet = new Set();

// Generate and add 10,000 unique items to the set
for (let i = 0; i < 10000; i++) {
  mySet.add(i);
}

Tests:

[...]
[...mySet]
Set.prototype.values()
mySet.values()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
[...]
Set.prototype.values()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
[...]	75898.0 Ops/sec
Set.prototype.values()	27722386.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON for the "Set array expansion" benchmark.

**What is being tested?**

The benchmark tests two different approaches to working with large sets in JavaScript:

1. **Expanding the set into an array using the spread operator (`[...mySet]`)**: This approach converts the `Set` object into an array, allowing for indexing and iteration.
2. **Using the `values()` method of the `Set` prototype**: This approach returns a live view of the set's values as an iterable sequence.

**Options being compared**

The benchmark compares the performance of these two approaches:

* Expanding the set into an array using `[...mySet]`
* Using the `values()` method of the `Set` prototype

**Pros and Cons of each approach:**

1. **Expanding the set into an array using `[...mySet]`**:
	* Pros:
		+ Allows for indexing and iteration, which can be beneficial in certain scenarios.
		+ Can be used with existing array methods and libraries.
	* Cons:
		+ Creates a new array, which can lead to increased memory usage and slower performance.
		+ May not be the most efficient way to access individual elements or iterate over the set's values.
2. **Using the `values()` method of the `Set` prototype**:
	* Pros:
		+ Returns an iterable sequence, which allows for lazy iteration and reduced memory usage.
		+ Can be more efficient than expanding the set into an array.
	* Cons:
		+ May not support indexing or iteration in the same way as an array.
		+ Requires specific knowledge of the `Set` prototype's methods.

**Library used**

The benchmark uses the built-in `Set` object and its `values()` method, which is a part of the JavaScript standard library. No external libraries are required.

**Special JS feature or syntax**

This benchmark does not use any special JavaScript features or syntax beyond what's already covered by the standard library (e.g., `let`, `const`, `for`, etc.).

**Other alternatives**

If you're interested in exploring other approaches, here are a few examples:

* Using a different data structure, such as an array or object, to represent the set.
* Implementing your own iteration mechanism for sets using loops and conditional statements (as opposed to relying on built-in methods like `values()`).
* Using external libraries or frameworks that provide optimized implementations of set operations.

Keep in mind that these alternatives might not be supported by all JavaScript engines or environments.

Related benchmarks:

Set array expansion (version: 0)

Tests the implications of expanding large sets into an array for finding values within them

Comparing performance of: [...] vs Set.prototype.values()

Created: one year ago by: Guest

Jump to the latest result

[...]

Set.prototype.values()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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