Benchmark: Array.from vs Spread using 10000 elements

Tests:

Array.from
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<10000;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

Latest run results:

Run details: (Test run date: 8 months ago)

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Browser/OS: Firefox 142 on Windows

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Test name	Executions per second
Array.from	1434.3 Ops/sec
Spread	1396.4 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 data and explain what is being tested.

**Benchmark Definition**

The benchmark is testing two approaches to convert a Set object to an Array: `Array.from` and using the spread operator (`...`). The test case uses 10,000 elements.

**Options Compared**

Two options are compared:

1. **Array.from**: This method creates a new Array instance from an iterable or an array-like object. It's specifically designed for converting Sets, Arrays, and other iterable objects to arrays.
2. **Spread Operator (`...`)**: This operator can be used to convert a Set to an array by spreading its elements into a new array.

**Pros and Cons**

* **Array.from**: Pros:
	+ More explicit and readable way to convert Sets to arrays.
	+ Can handle larger sets without performance issues.
	Cons:
	+ May have slightly slower execution times compared to the spread operator.
* **Spread Operator (`...`)**: Pros:
	+ Often faster than `Array.from`.
	+ More concise and easier to read in some cases.
Cons:
	+ Less explicit and may be less readable for developers unfamiliar with this syntax.

**Library and Purpose**

None of the test cases explicitly use a library, but they do rely on built-in JavaScript features:

* `Set`: A data structure that stores unique values.
* `Array.from()`: A method that converts an iterable to an array.
* Spread Operator (`...`): A feature introduced in ECMAScript 2015 (ES6) that allows elements to be spread into a new array or object.

**Special JS Feature**

The test case uses the spread operator, which is a special JavaScript feature. However, since it's already part of the standard library since ES6, no additional explanation is needed.

**Other Alternatives**

There are other ways to convert Sets to arrays, such as using `Array.prototype.slice()` or creating a custom function. However, these approaches may not be as efficient or readable as `Array.from` or the spread operator.

If you're interested in exploring alternative approaches, here's an example of using `Array.prototype.slice()`:

```javascript
var fooSet = new Set();
for (var i = 0; i < 10000; i++) {
  fooSet.add(i);
}
var other = Array.prototype.slice.call(fooSet);
```

Keep in mind that this approach may have performance implications due to the overhead of calling `slice()` on an array.

Related benchmarks:

Array.from vs Spread using 10000 elements (version: 0)

Comparing performance of: Array.from vs Spread

Created: one year ago by: Guest

Jump to the latest result

Array.from

Spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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