Benchmark: Array.from vs Spread 100000

Tests:

Array.from
var fooSet = new Set(); for(var i=0;i<100000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<100000;i++) { fooSet.add(i); } var other = [...fooSet];

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

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, the options compared, their pros and cons, and other considerations.

**What is being tested?**

The test case measures the performance of two approaches to convert a set of numbers to an array:

1. `Array.from(fooSet)`: This method converts a Set object (`fooSet`) to an Array.
2. `[...fooSet]`: This syntax uses the spread operator to convert the same Set object to an Array.

**Options compared**

The test case compares these two approaches, but there's another option that's often considered in similar scenarios:

3. `Array.prototype.slice()`: This method creates a new array by slicing the original set of numbers.

However, since this method doesn't directly compare to converting a Set to an array, we'll focus on the first two options.

**Pros and Cons**

1. **`Array.from(fooSet)`**:
	* Pros:
		+ More explicit and readable than using the spread operator.
		+ Can be used with other Array methods, such as `map()` or `filter()`.
	* Cons:
		+ May incur additional overhead due to the need to create a new array object.
2. **`[...fooSet]` (Spread Operator)**:
	* Pros:
		+ More concise and expressive than using `Array.from()`.
		+ Can be used with other Array methods, such as `map()` or `filter()`.
	* Cons:
		+ May have performance issues if the array is very large or dense.

**Other considerations**

When working with Sets and arrays in JavaScript, it's essential to consider the following factors:

* **Performance**: Both approaches can be optimized by using techniques like caching or pre-allocating memory.
* **Memory usage**: Converting a Set to an array can lead to increased memory usage, especially if the set contains many elements.
* **Readability and maintainability**: Using explicit methods like `Array.from()` can make code more readable, while the spread operator syntax might be less intuitive.

**Library and special JS features**

The test case doesn't use any external libraries. However, it does utilize some specific JavaScript features:

* **Set object**: Introduced in ECMAScript 2015 (ES6), Sets provide an efficient way to store unique values.
* **Spread operator (`[...]`)**: Also introduced in ES6, the spread operator is used to expand an array into individual elements or to create a new array from existing elements.

**Other alternatives**

If you want to explore other approaches, consider using:

* `Array.prototype.slice()` (as mentioned earlier)
* `Array.from()``` with `ArrayBuffer` and `Uint32Array`
* Using libraries like Lodash's `setToArray()` function

Keep in mind that the performance differences between these methods might be negligible for most use cases. The choice ultimately depends on your specific requirements, such as readability, maintainability, or performance optimization.

Related benchmarks:

Array.from vs Spread 100000 (version: 0)

Comparing performance of: Array.from vs Spread

Created: 2 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):