Benchmark: Set array expansion Part 3

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:

[...]
const setArray = [...mySet]
Set.prototype.values()
const setArray = mySet.values()
Array.from
const setArray = Array.from(mySet)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

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
[...]	77148.5 Ops/sec
Set.prototype.values()	27478752.0 Ops/sec
Array.from	77360.1 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Overview**

The `Set` object is used to store unique values in JavaScript. The benchmark tests how different methods perform when expanding a large set into an array for finding values within it. The test cases compare the performance of three approaches: using the spread operator (`[...mySet]`), calling `values()` on the `Set` prototype, and using `Array.from(mySet)`.

**Test Cases**

1. **Using the Spread Operator `[...mySet]`**
	* Purpose: Convert a `Set` object into an array.
	* Pros:
		+ Simple and concise syntax.
		+ Fast execution (average time: 20-30 ms for 10,000 elements).
	* Cons:
		+ May not be the most efficient method, as it creates a new array and copies all elements.
2. **Calling `values()` on the `Set` prototype**
	* Purpose: Get an iterator over the values in the set, which can be converted to an array using `Array.from()`.
	* Pros:
		+ More flexible than the spread operator, as it allows iterating over the set without creating a new array.
		+ May be more efficient for large sets, as it avoids creating a new array.
	* Cons:
		+ Requires calling the `values()` method on the `Set` prototype, which might be slower than using the spread operator directly.
3. **Using `Array.from(mySet)`**
	* Purpose: Convert a `Set` object into an array.
	* Pros:
		+ More explicit and easy to understand than the spread operator.
		+ May be faster than the spread operator for large sets, as it uses native code optimization.
	* Cons:
		+ Less concise syntax compared to the spread operator.

**Library: `Set`**

The `Set` object is a built-in JavaScript data structure that stores unique values. Its purpose is to provide an efficient way to store and look up values in a set of unique elements. The `values()` method on the `Set` prototype returns an iterator over the values in the set.

**Special JS Feature/Syntax: None**

There are no special features or syntax used in this benchmark that require specific knowledge or expertise.

**Other Alternatives**

Alternative approaches to converting a `Set` object into an array include:

* Using `mySetToArray()` function (not shown in the benchmark code)
* Using a library like Lodash's `setToSafeArray()`
* Implementing a custom conversion function using JavaScript's built-in methods, such as `forEach()` and `map()`

Keep in mind that the performance difference between these alternatives may be negligible for small sets, but could become significant for large datasets.

Overall, the benchmark provides a good understanding of how different approaches to converting a `Set` object into an array perform in terms of speed and efficiency.

Related benchmarks:

Set array expansion Part 3 (version: 0)

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

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

Created: one year ago by: Guest

Jump to the latest result

[...]

Set.prototype.values()

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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