Benchmark: Array.from vs Spread - 1000000 times

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:

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

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

**Benchmark Definition**

The benchmark measures the performance difference between two approaches: using `Array.from()` and using the spread operator (`...`) to create an array from a Set object.

**Options Compared**

There are two options being compared:

1. **Array.from()**: This method creates a new array by mapping over the elements of a given iterable (in this case, a Set object). It's a standard JavaScript method that has been available since ES6.
2. **Spread Operator (`...`)**: This operator is used to create a new array by spreading out the elements of an iterable.

**Pros and Cons**

* **Array.from()**:
	+ Pros: More explicit and readable, as it clearly conveys the intention of creating an array from an iterable. It's also more stable across different browsers.
	+ Cons: May be slightly slower due to the overhead of mapping over the elements.
* **Spread Operator (`...`)**:
	+ Pros: More concise and expressive, as it eliminates the need for explicit array creation. It's also a part of the ES6 standard and widely supported by modern browsers.
	+ Cons: Less readable and less explicit than `Array.from()`, which may lead to mistakes if not used correctly.

**Library Used**

Neither option uses a specific library in this benchmark, as both are native JavaScript methods. However, it's worth noting that Set objects are part of the ES6 standard and have been widely supported by browsers for many years.

**Special JS Feature or Syntax**

The benchmark doesn't use any special JavaScript features or syntax beyond the standard ES6 methods. However, it does rely on modern browser support for both `Array.from()` and the spread operator (`...`).

**Other Alternatives**

If you want to compare other approaches, here are a few alternatives:

* **Using `forEach()`**: Instead of using `Array.from()`, you could use the `forEach()` method to create an array. This approach would be less readable than `Array.from()` but might be faster due to the overhead of mapping.
* **Using `map()`**: Similarly, you could use the `map()` method instead of `Array.from()`. This approach is more explicit and readable than using `Array.from()`.

To run this benchmark on your own, you would need to create a new Set object with 10,000 elements and then measure the execution time of both approaches. The script preparation code for this benchmark is likely to involve creating a new Set object and adding elements to it, followed by measuring the execution time of each approach.

Related benchmarks:

Array.from vs Spread - 1000000 times (version: 0)

Comparing performance of: Array.from vs Spread

Created: 6 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):